-
Comment on the reactions of dihydrogen
with
Chlorine (ii) Sodium and (iii) Copper(II)oxide.
View Answer play_arrow
-
Would you expect the hydrides of N, O and F to have lower
boiling points than the hydrides of their subsequent group members? Give
reason.
View Answer play_arrow
-
Can phosphorus with outer electronic configuration \[3{{s}^{2}}3{{p}^{3}}\]
form \[P{{H}_{5}}\]?
View Answer play_arrow
-
How many hydrogen bonded water molecules are associated in\[CuS{{O}_{4}}.5{{H}_{2}}O?\]
View Answer play_arrow
-
Calculate the strength of 10 volume solution of hydrogen
peroxide.
View Answer play_arrow
-
Justify the position of hydrogen in the periodic table on
the basis of its electronic configuration.
View Answer play_arrow
-
Write the names of isotopes of hydrogen. What is the mass
ratio of these isotopes?
View Answer play_arrow
-
Why does hydrogen occur in diatomic form rather than in
mono-atomic form under normal conditions?
View Answer play_arrow
-
How can the production of dihydrogen, obtained from coal
gasification be increased?
View Answer play_arrow
-
Describe the bulk preparation of dihydrogen by electrolytic
method. What is the role of an electrolyte in this process?
View Answer play_arrow
-
Complete the following:
(i) \[{{H}_{2}}(g)+{{M}_{m}}{{O}_{o}}(s)\xrightarrow{Heat}\]
(ii) \[CO(g)+{{H}_{2}}(g)\xrightarrow[Catayst]{Heat}\]
(iii) \[{{C}_{3}}{{H}_{g}}(g)+3{{H}_{2}}O(g)\xrightarrow[Catayst]{Heat}\]
(iv) \[Zn(s)+NaOH(aq)\xrightarrow{Heat}\]
View Answer play_arrow
-
Discuss the consequences of high enthalpy of H-H in terms of
chemical reactivity.
View Answer play_arrow
-
What do you understand by (i) electron deficient (ii)
electron precise and (iii) electron rich compounds of hydrogen? Provide
justification with suitable examples.
View Answer play_arrow
-
What characteristics do you expect from electron deficient
hydrides with respect to its structure and chemical reactivity?
View Answer play_arrow
-
Do you expect the carbon hydride of the type \[({{C}_{n}}{{H}_{2n+2}})\]to
act as Lewis acid or base? Justify your answer.
View Answer play_arrow
-
What do you understand by the term non-stoichiometric
hydrides? Do you expect these types of hydrides to be formed by alkali metals? Justify
your answer.
View Answer play_arrow
-
How do you expect the metallic hydrides to be useful for
hydrogen storage? Explain.
View Answer play_arrow
-
How does atomic hydrogen or oxy-hydrogen torch function for
cutting and welding purposes? Explain.
View Answer play_arrow
-
Among \[N{{H}_{3}}{{H}_{2}}O\] and HF which would you expect
to have highest magnitude of hydrogen bonding and why?
View Answer play_arrow
-
Saline hydrides such as \[NaH\] or \[Ca{{H}_{2}}\] react
with water violently producing fire. Can\[C{{O}_{2}}\], a well known fire extinguisher,
be used in this case? Explain.
View Answer play_arrow
-
Arrange the
following:
(i) \[Ca{{H}_{2}},Be{{H}_{2}}\]
and \[Ti{{H}_{2}}\] in order of increasing electrical conductance.
(ii) \[\text{LiH},\text{
NaH},\text{ CsH}\] in order of increasing ionic nature.
(iii) HH, DD and
FF in order of increasing bond dissociation energy.
(iv) \[NaH,Mg{{H}_{2}}\] and \[{{H}_{2}}O\] in order of
increasing reducing property.
View Answer play_arrow
-
Compare the structures of \[{{H}_{2}}O\] and\[{{H}_{2}}{{O}_{2}}\].
View Answer play_arrow
-
What do you understand by the term autoprotolysis' of
water? What is its significance?
View Answer play_arrow
-
Consider the reaction of water with \[{{F}_{2}}\] and
suggest in terms of oxidation and reduction, which species are oxidised/reduced.
View Answer play_arrow
-
Complete the
following reactions:
(i) \[PbS(s)+{{H}_{2}}{{O}_{2}}(aq)\to
\]
(ii) \[MnO_{4}^{-}(aq)+{{H}_{2}}{{O}_{2}}(aq)\to
\]
(iii) \[CaO(s)+{{H}_{2}}O(g)\to
\]
(iv) \[AlC{{l}_{3}}(g)+{{H}_{2}}O(l)\xrightarrow{{}}\]
(v) \[C{{a}_{3}}{{N}_{2}}(s)+{{H}_{2}}O(l)\xrightarrow{{}}\]
View Answer play_arrow
-
Describe the structure of the common form of ice.
View Answer play_arrow
-
What causes the temporary and permanent hardness of water?
View Answer play_arrow
-
Discuss the principle and method of softening of hard water
by synthetic ion exchange resins.
View Answer play_arrow
-
Write chemical
reactions to show amphoteric nature of water.
View Answer play_arrow
-
Write chemical reactions to justify that hydrogen peroxide
can function as an oxidising as well as a reducing agent.
View Answer play_arrow
-
What is demineralised water and how it can obtained?
View Answer play_arrow
-
Is demineralised water or distilled water is useful for drinking
purposes? If not, how it can be made useful?
View Answer play_arrow
-
Describe the usefulness of water in biosphere and biological
systems.
View Answer play_arrow
-
What properties of water make
it useful as a solvent?
What type of compounds can it (i) dissolve (ii) hydrolyse?
View Answer play_arrow
-
Knowing the
properties of \[{{H}_{2}}O\] and \[{{D}_{2}}O\], do you think that \[{{D}_{2}}O\]
can be used for drinking purposes?
View Answer play_arrow
-
What is the difference between hydrolysis and hydration?
View Answer play_arrow
-
How can saline hydrides remove traces of water from organic
compounds?
View Answer play_arrow
-
What do you expect the nature of hydrides if formed by
elements of atomic numbers 15, 19, 23, 44 with dry dihydrogen? Compare their
behaviour towards water.
View Answer play_arrow
-
Do you expect different products in solution when aluminium
(III) chloride and potassium chloride are treated with (i) normal water, (ii)
acidified water, (iii) alkaline water.
View Answer play_arrow
-
How does \[{{H}_{2}}{{O}_{2}}\] behave as a bleaching agent?
View Answer play_arrow
-
question_answer41)
Hydrogen
resembles halogens in many respects for which several factors are responsible.
Of the following factors which one is most important in this respect?
(a)
Its tendency to lose an electron to form a cation
(b)
Its tendency to gain a single electron in its valence shell to attain stable
electronic configuration
(c)
Its low negative electron gain enthalpy value
(d)
Its small size
View Answer play_arrow
-
question_answer42)
Why
does \[{{H}^{+}}\] ion always get associated with other atoms or molecules?
(a)
lonisation enthalpy of hydrogen resembles that of alkali metals
(b)
Its reactivity is similar to halogens
(c)
It resembles both alkali metals and halogens
(d)
Loss of an electron from hydrogen atom results in a nucleus of very small size
as compared to other atoms orions. Due to small size it cannot exist free
View Answer play_arrow
-
question_answer43)
Metal
hydrides are ionic, covalent or molecular in nature.
Among\[LiH,\text{
}NaH,\text{ }KH,\text{ }RbH,\text{ }CsH\], the correct order of increasing
ionic character is:
(a)
\[LiH>NaH>CsH>KH>RbH\] (b) \[LiH<NaH<KH<RbH<CsH\]
(c)
\[RbH>CsH>NaH>KH>LiH\] (d) \[NaH>CsH>RbH>LiH>KH\]
View Answer play_arrow
-
question_answer44)
Which
of the following hydrides is electron deficient hydride?
(a)
\[{{B}_{2}}{{H}_{6}}\] (b)\[N{{H}_{3}}\] (c)
\[{{H}_{2}}O\] (d) \[C{{H}_{4}}\]
View Answer play_arrow
-
question_answer45)
Radioactive
elements emit a, P and y-rays and are characterised by their half-lives. The
radioactive isotope of hydrogen is:
(a)
protium (b) deuterium (c) tritium (d)
hydronium
View Answer play_arrow
-
question_answer46)
Consider
the reactions :
(a)\[{{H}_{2}}{{O}_{2}}+2HI\to
{{I}_{2}}+2{{H}_{2}}O\]
(b)
\[HOCl+{{H}_{2}}{{O}_{2}}\to {{H}_{3}}{{O}^{+}}+C{{l}^{-}}+{{O}_{2}}\]
which
of the following statements is correct about \[{{H}_{2}}{{O}_{2}}\]with
reference to these reactions? Hydrogen peroxide is
(a)
an oxidising agent in both (A) and (B)
(b)
an oxidising agent in (A) and reducing agent in (B)
(c)
a reducing agent in (A) and oxidising agent in (B)
(d)
a reducing agent in both (A) and (B)
View Answer play_arrow
-
question_answer47)
The
oxide that gives \[{{H}_{2}}{{O}_{2}}\] on treatment with dilute \[{{H}_{2}}S{{O}_{4}}\]is.......
(a)\[Pb{{O}_{2}}\] (b)\[Ba{{O}_{2}}\cdot
8{{H}_{2}}O\] (c)\[Mn{{O}_{2}}\] (d) \[Ti{{O}_{2}}\]
View Answer play_arrow
-
question_answer48)
Which
of the following equations depict the oxidising nature of\[{{H}_{2}}{{O}_{2}}\]?
(a)\[2MnO_{4}^{-}+6{{H}^{+}}5{{H}_{2}}{{O}_{2}}\to
2M{{n}^{2+}}+8{{H}_{2}}O+5{{O}_{2}}\]
(b)
\[2F{{e}^{3+}}+2{{H}^{+}}+{{H}_{2}}{{O}_{2}}\to
2F{{e}^{2+}}+2{{H}_{2}}O+{{O}_{2}}\]
(c)
\[2{{I}^{-}}+2{{H}^{+}}+{{H}_{2}}{{O}_{2}}\to {{I}_{4}}+2{{H}_{2}}O\]
(d)
\[KI{{O}_{4}}+{{H}_{2}}{{O}_{2}}\to KI{{O}_{3}}+{{H}_{2}}O+{{O}_{2}}\]
View Answer play_arrow
-
question_answer49)
Which
of the following equations depicts reducing nature of\[{{H}_{2}}{{O}_{2}}\]?
(a)
\[2{{[Fe{{(CN)}_{6}}]}^{4-}}2{{H}^{+}}+{{H}_{2}}{{O}_{2}}\to
2{{[Fe{{(CN)}_{6}}]}^{3-}}+2{{H}_{2}}O\]
(b)
\[{{I}_{2}}+{{H}_{2}}{{O}_{2}}+2O{{H}^{-}}\to 2{{I}^{-}}2{{H}_{2}}O+{{O}_{2}}\]
(c)
\[M{{n}^{2+}}+{{H}_{2}}{{O}_{2}}\to M{{n}^{2+}}+2O{{H}^{-}}\]
(d)
\[PbS+4{{H}_{2}}{{O}_{2}}\to PbS{{O}_{4}}+4{{H}_{2}}O\]
View Answer play_arrow
-
question_answer50)
Hydrogen
peroxide is..........
(a)
an oxidising agent (b) a
reducing agent
(c)
both an oxidising and a reducing agent (d) neither oxidising nor
reducing agent
View Answer play_arrow
-
question_answer51)
Which
of the following reactions increases production of dihydrogen from synthesis
gas?
(a)
\[C{{H}_{2}}(g)+{{H}_{2}}O(g)\xrightarrow[Ni]{127K}CO(g)+3{{H}_{2}}(g)\] (b) \[C(s)+{{H}_{2}}O(g)\xrightarrow{1270K}CO(g)+{{H}_{2}}(g)\]
(c)
\[CO(g)+{{H}_{2}}O(g)\xrightarrow[catayst]{673K}C{{O}_{2}}(g)+{{H}_{2}}(g)\] (d)
\[{{C}_{2}}{{H}_{6}}+2{{H}_{2}}O\xrightarrow[Ni]{1270K}2CO+5{{H}_{2}}\]
View Answer play_arrow
-
question_answer52)
When
sodium peroxide is treated with dilute sulphuric acid, we get.......
(a)
sodium sulphate and water (b) sodium sulphate
and oxygen
(c)
sodium sulphate, hydrogen and oxygen (d) sodium sulphate and hydrogen
peroxide
View Answer play_arrow
-
question_answer53)
Hydrogen
peroxide is obtained by the electrolysis of :
(a)
water (b) sulphuric acid (c)
hydrochloric acid (d) fused sodium peroxide
View Answer play_arrow
-
question_answer54)
Which
of the following reactions is an example of use of water gas in the synthesis
of other compounds?
1970
V.
(a)
\[C{{H}_{4}}(g)+{{H}_{2}}O(g)\xrightarrow[Ni]{1270K}CO(g)+{{H}_{2}}(g)\] (b) \[CO(g)+{{H}_{2}}O(g)\xrightarrow[catalyst]{673K}C{{O}_{2}}(g)+{{H}_{2}}(g)\]
(c)
\[{{C}_{n}}{{H}_{2n+2}}+n{{H}_{2}}O(g)\xrightarrow[Ni]{1270K}nCO(g)+(2n+1){{H}_{2}}(g)\] (d)
\[CO(g)+2{{H}_{2}}(g)\xrightarrow[catayst]{cobalt}C{{H}_{3}}OH(l)\]
View Answer play_arrow
-
question_answer55)
Which
of the following ions will cause hardness in water sample?
(a)
\[C{{a}^{2+}}\] (b) \[N{{a}^{+}}\] (c)
\[C{{l}^{-}}\] (d) \[{{K}^{+}}\]
View Answer play_arrow
-
question_answer56)
Which
of the following compounds is used for water softening?
(a)\[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\] (b)
\[N{{a}_{3}}P{{O}_{4}}\] (c)\[N{{a}_{5}}{{P}_{6}}{{O}_{18}}\] (d)\[N{{a}_{2}}HP{{O}_{4}}\]
View Answer play_arrow
-
question_answer57)
Elements
of which of the following group(s) of periodic table do not form hydrides?
(a)
groups 7,8,9 (b) group 13 (c) groups
15,16,17 (d) group 14
View Answer play_arrow
-
question_answer58)
Only
one element of ...... forms hydride.
(a)
group 6 (b) group 7 (c) group
8 (d) group 9
View Answer play_arrow
-
question_answer59)
Which
of the following statements are not true for hydrogen?
(a)
It exists as diatomic molecule.
(b)
It has one electron in the outermost shell.
(c)
It can lose an electron to form a cation which can freely exist.
(d)
It forms a large number of ionic compounds by losing an electron.
View Answer play_arrow
-
question_answer60)
Dihydrogen
can be prepared on commercial scale by different methods. In its preparation by
the action of steam on hydrocarbons, a mixture of \[CO\]and \[{{H}_{2}}\] gas
is formed. It is known as...... .
(a)
water gas (b) syngas (c)
producer gas (d) industrial gas
View Answer play_arrow
-
question_answer61)
Which
of the following statements) is/are correct in the case of heavy water?
(a)
Heavy water is used as a moderator in nuclear reactor.
(b)
Heavy water is more effective solvent than ordinary water.
(c)
Heavy water is more associated than ordinary water.
(d)
Heavy water has lower boiling point than ordinary water.
View Answer play_arrow
-
question_answer62)
Which
of the following statements about hydrogen are correct?
(a)
Hydrogen has three isotopes of which protium is most common.
(b)
Hydrogen never acts as cation in ionic salts.
(c)
Hydrogen ion,\[{{H}^{+}}\], exists freely in solution.
(d)
Dihydrogen does not act as a reducing agent.
View Answer play_arrow
-
question_answer63)
Some
of the properties of water are described below. Which of them is/are not
correct?
(a)
Water is known to be a universal solvent.
(b)
Hydrogen bonding is present to a large extent in liquid water.
(c)
There is no hydrogen bonding in the frozen state of water.
(d)
Frozen water is heavier than liquid water.
View Answer play_arrow
-
question_answer64)
Hardness
of water may be temporary or permanent. Permanent hardness is due to the
presence of:
(a)
chlorides of\[~Ca\] and \[Mg\]in water
(b)
sulphates of \[~Ca\]and \[Mg\] in water
(c)
hydrogen carbonates of Ca and Mg in water
(d)
carbonates of alkali metals in water
View Answer play_arrow
-
question_answer65)
Which
of the following statements are correct?
(a)
Elements of group 15 form electron deficient hydrides.
(b)
All elements of group 14 form electron precise hydrides.
(c)
Electron precise hydrides have tetrahedral geometries.
(d)
Electron rich hydrides can act as Lewis acids.
View Answer play_arrow
-
question_answer66)
Which
of the following statements are correct?
(a)
Hydrides of group 13 act as Lewis acids.
(b)
Hydrides of group 14 are electron deficient hydrides.
(c)
Hydrides of group 14 act as Lewis acids.
(d)
Hydrides of group 15 act as Lewis bases.
View Answer play_arrow
-
question_answer67)
Which
of the following statements are correct?
(a)
Metallic hydrides are deficient of hydrogen.
(b)
Metallic hydrides conduct heat and electricity.
(c)
Ionic hydrides do not conduct electricity in solid state.
(d)
Ionic hydrides are very good conductors of electricity in solid state.
View Answer play_arrow
-
question_answer68)
How
can production of hydrogen from water gas be increased by using water gas shift
reaction?
View Answer play_arrow
-
question_answer69)
What
are metallic/interstitial hydrides? How do they differ from molecular hydrides?
View Answer play_arrow
-
question_answer70)
Name
the classes of hydrides to which \[{{H}_{2}}{{O}_{2}},{{B}_{2}}{{H}_{6}}\] and\[NaH\]
belong.
View Answer play_arrow
-
question_answer71)
If
same mass of liquid water and a piece of ice is taken, then why is the density
of ice less than that of liquid water?
View Answer play_arrow
-
question_answer72)
Compare
the following equations :
(i)
\[PbS(s)+{{H}_{2}}O(aq.)\to \]
(ii)
\[CO(g)+2{{H}_{2}}(g)\xrightarrow[Catayst]{Cobalt}\]
View Answer play_arrow
-
question_answer73)
Give
reasons :
(i)
Lakes freeze from top towards bottom.
(ii)
Ice floats on water.
View Answer play_arrow
-
question_answer74)
What
do you understand by the term 'auto protolysis of water'? What is its
significance?
View Answer play_arrow
-
question_answer75)
Discuss
briefly demineralisation of water by ion exchange resin.
View Answer play_arrow
-
question_answer76)
Molecular
hydrides are classified as electron deficient, electron precise and electron
rich compounds. Explain each type with two examples.
View Answer play_arrow
-
question_answer77)
How
is heavy water prepared? Compare its physical properties with those of ordinary
water.
View Answer play_arrow
-
question_answer78)
Write
one chemical reaction for the preparation of\[{{D}_{2}}{{O}_{2}}\].
View Answer play_arrow
-
question_answer79)
Calculate
the strength of 5 volume \[{{H}_{2}}{{O}_{2}}\] solution.
View Answer play_arrow
-
question_answer80)
(i)
Draw the gas phase and solid phase structure of\[{{H}_{2}}{{O}_{2}}\].
(ii)\[{{H}_{2}}{{O}_{2}}\]is
a better oxidising agent than water. Explain.
View Answer play_arrow
-
question_answer81)
Melting
point, enthalpy of vaporisation and viscosity data of \[{{H}_{2}}{{O}_{2}}\]
and \[{{D}_{2}}{{O}_{2}}\] are given below :
|
\[{{H}_{2}}O\]
|
\[{{D}_{2}}O\]
|
Melting
point
|
373.0
|
374.4
|
Enthalpy of
vaporization at\[(373K)/kJmo{{l}^{-1}}\]
|
40.66
|
41.61
|
Viscosity/centipoise
|
0.8903
|
1.107
|
On the
basis of this data, explain in which of these liquids intermolecular forces are
stronger.
View Answer play_arrow
-
question_answer82)
Dihydrogen
reacts with dioxygen\[({{O}_{2}})\] to form water. Write the name and formula
of the product when the isotope of hydrogen which has one proton and one
neutron in its nucleus is treated with oxygen. Will the reactivity of both the
isotopes be the same towards oxygen? Justify your answer.
View Answer play_arrow
-
question_answer83)
Explain
why \[HCl\]is a gas and HF is a liquid?
View Answer play_arrow
-
question_answer84)
When
the first element of the periodic table is treated with dioxygen, it gives a
compound whose solid state floats on its liquid state. This compound has an
ability to act as an acid as well as a base. What products will be formed when
the compound undergoes auto ionisation?
View Answer play_arrow
-
question_answer85)
Rohan
heard that instructions were given to the laboratory attendant to store a
particular chemical, i.e., to keep it in a dark room, add some urea to it and
keep it away from dust. This chemical acts as an oxidising as well as a
reducing agent in both acidic and alkaline media. This chemical is important
for use in pollution control treatment of domestic and industrial effluents.
(i)
Write the name of this compound.
(ii)
Explain why such precautions are taken for storing the chemical?
View Answer play_arrow
-
question_answer86)
Give
reasons why hydrogen resembles alkali metals?
View Answer play_arrow
-
question_answer87)
Hydrogen
generally forms covalent compounds. Give reason.
View Answer play_arrow
-
question_answer88)
Why
is the ionisation enthalpy of hydrogen higher than that of sodium?
View Answer play_arrow
-
question_answer89)
Basic
principle of hydrogen economy is transportation and storage of energy in the
form of liquid or gaseous hydrogen.
Which
property of hydrogen may be useful for this purpose?
Support
your answer with chemical equation if required.
View Answer play_arrow
-
question_answer90)
What
is the importance of heavy water?
View Answer play_arrow
-
question_answer91)
Write
the Lewis structure of hydrogen peroxide.
View Answer play_arrow
-
question_answer92)
An
acidic solution of hydrogen peroxide behaves as an oxidising as well as a
reducing agent, illustrate it with the help of a chemical equation.
View Answer play_arrow
-
question_answer93)
With
the help of suitable examples, explain the property of\[{{H}_{2}}{{O}_{2}}\]
that is responsible for its bleaching action.
View Answer play_arrow
-
question_answer94)
Why
is water molecule polar?
View Answer play_arrow
-
question_answer95)
Why
does water show high boiling point as compared to hydrogen sulphide? Give
reasons for your answer.
View Answer play_arrow
-
question_answer96)
Why
can dilute solutions of \[{{H}_{2}}{{O}_{2}}\] not be concentrated by heating?
How can concentrated solution of \[{{H}_{2}}{{O}_{2}}\]be obtained?
View Answer play_arrow
-
question_answer97)
Why
is hydrogen peroxide stored in wax lined bottles?
View Answer play_arrow
-
question_answer98)
Why
does hard water not form lather with soap?
View Answer play_arrow
-
question_answer99)
Phosphoric
acid is preferred over sulphuric acid in preparing hydrogen peroxide. Why?
View Answer play_arrow
-
question_answer100)
How
will you account for \[104.5{}^\circ \]bond angle in water?
View Answer play_arrow
-
question_answer101)
Write
redox reactions between fluorine and water.
View Answer play_arrow
-
question_answer102)
Write
two reactions to explain amphoteric nature of water.
View Answer play_arrow
-
question_answer103)
Correlate
the items listed in Column I with those listed in Column II. Find out as many
correlations as you can.
Column I
|
Column II
|
(i) Synthesis gas
|
(a) \[N{{a}_{2}}\left[
N{{a}_{4}}{{(P{{O}_{4}})}_{6}} \right]\]
|
(ii) Dihydrogen
|
(b) Oxidising agent
|
(iii) Heavy water
|
(c) Softening of water
|
(iv) Calgon
|
(d) Reducing agent
|
(v) Hydrogen peroxide
|
(e) Stoichiometric
compounds of s-block elements
|
(vi) Salt like hydrides
|
(f) Prolonged
electrolysis of water
|
|
(g) \[Zn+NaOH\]
|
|
(h) \[Zn\text{ }+\text{
}dil.\text{ }{{H}_{2}}S{{O}_{4}}\]
|
|
(i) Synthesis of \[C{{H}_{3}}OH\]
|
|
(j) Mixture of CO and \[{{H}_{2}}\]
|
View Answer play_arrow
-
question_answer104)
Match
Column I with Column II for the given properties/applications.
Column I
|
Column II
|
(i) H
|
(a) Used in the name of
perhydrol
|
(ii) \[{{H}_{2}}\]
|
(b) Can be reduced to
dihydrogen by \[NaH\]
|
(iii) \[{{H}_{2}}O\]
|
(c) Can be used in
hydroformy- lation of olefin
|
(iv) \[{{H}_{2}}{{O}_{2}}\]
|
(d) Can be used in
cutting and welding
|
View Answer play_arrow
-
question_answer105)
Match
the terms in Column I with relevant item in Column II.
Column I
|
Column II
|
(i) Electrolysis of
water produces
|
(a) atomic reactor
|
(ii) Lithium aluminium
hydride is used as
|
(b) polar molecule
|
(iii) Hydrogen chloride
is a
|
(c) recombines on metal
surface to generate high temperature
|
(iv) Heavy water is
used in
|
(d) reducing agent
|
(v) Atomic hydrogen
|
(e) hydrogen and oxygen
|
View Answer play_arrow
-
question_answer106)
Match the
items in Column I with the relevant items in Column II.
Column I
|
Column II
|
(i) Hydrogen peroxide
is used as a
|
(a) Zeolite
|
(ii) Used in calgon
method
|
(b) Perhydrol
|
(iii) Permanent
hardness of hard water is removed by
|
(c) Sodium hexametaphosphate
|
|
(d) Propellant
|
View Answer play_arrow
-
question_answer107)
In
the following questions a statement of Assertion (A) followed by a statement of
Reason (R) is given. Choose the correct option out of the choices given below
each question.
(a)
If both A and R are correct and R is the correct explanation
of the A.
(b)
If both A and R are correct but R is not the correct explanation
of the A.
(c)
If A is correct but R is incorrect.
(d)
If A is incorrect but R is correct.
(A)
Permanent hardness of water is removed by treatment with washing soda.
(R)
Washing soda reacts with soluble magnesium and calcium sulphate to form
insoluble carbonates.
View Answer play_arrow
-
question_answer108)
(A)
Some metals like platinum and palladium can be used as storage media for
hydrogen.
(R)
Platinum and palladium can adsorb large volumes of hydrogen.
View Answer play_arrow
-
question_answer109)
Atomic
hydrogen combines with almost all elements but molecular hydrogen does not.
Explain.
View Answer play_arrow
-
question_answer110)
How
can \[{{D}_{2}}O\] be prepared from water? Mention the physical properties in
which \[{{D}_{2}}O\] differs
from\[{{H}_{2}}O\]. Give at least three reactions of \[{{D}_{2}}O\] showing the
exchange of hydrogen with deuterium.
View Answer play_arrow
-
question_answer111)
How
will you concentrate\[{{H}_{2}}{{O}_{2}}\] ? Show differences between structure
of \[{{H}_{2}}{{O}_{2}}\] and \[{{H}_{2}}O\] by drawing their spatial
structures. Also mention three important uses of\[{{H}_{2}}{{O}_{2}}\].
View Answer play_arrow
-
question_answer112)
(i)
Give a method for the manufacture of \[{{H}_{2}}{{O}_{2}}\] and explain the
reactions involved therein.
(ii)
Illustrate oxidising, reducing and acidic properties of\[{{H}_{2}}{{O}_{2}}\]
with equations.
View Answer play_arrow
-
question_answer113)
What
mass of \[{{H}_{2}}{{O}_{2}}\] will be present in 2 litres of a 1 molar solution?
Calculate the mass of oxygen which will be liberated by the decomposition of
200 mL of this solution.
View Answer play_arrow
-
question_answer114)
A
colourless liquid ?A' contains H and O elements only. It decomposes slowly on
exposure to light. It is stabilised by mixing urea to store in the presence of
light.
(i)
Suggest possible structure of 'A?
(ii)
Write chemical equations for its decomposition reaction in light.
View Answer play_arrow
-
question_answer115)
An
ionic hydride of an alkali metal has significant covalent character and is
almost un reactive towards oxygen and chlorine. This is used in the synthesis
of other useful hydrides. Write the formula of the hydride. Write its reaction
with\[A{{l}_{2}}C{{l}_{6}}\].
View Answer play_arrow
-
question_answer116)
Sodium
forms a crystalline ionic solid with dihydrogen. The solid is non-volatile and
non-conducting in nature. It reacts violently with water to produce dihydrogen
gas. Write the formula of this compound and its reaction with water. What will
happen on electrolysis of the melt of this solid?
View Answer play_arrow