-
Why are pentahalides more covalent than trihalides?
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Why is BiH3 the strongest reducing agent amongst all the hydrides of Groups 15 elements?
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Why is N2 less reactive at room temperature?
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Mention the conditions to maximise the yield of ammonia.
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How does ammonia react with a solution of Cu2+?
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What is the
covalency of nitrogen in ?
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-
Bond angle in PH4+ is higher than in PH3. Why?
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What happens when white phosphorus is heated with concentrated NaOH solution in the inert atmosphere of CO2?
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What happens when PCI5 is heated?
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What is the basicity of H3PO4?
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What happens when H3PO3 is heated?
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-
List the important sources of sulphur.
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-
Write the order of thermal stability of the hydrides of group 16 elements.
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-
Why is H2O liquid and H2S is a gas?
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-
Which of the following does not react with oxygen directly?
Zn, Ti, Pt, Fe
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-
Complete the
following reactions:
(i) C2H4
+ O2
(ii) 4 Al + 3O2
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-
Why does ozone act as a powerful oxidising agent?
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-
How is O3 estimated quantitatively?
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-
What happens when sulphur dioxide is passed into aqueous solution of Fe(III) salt?
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-
Comment upon the nature of two S – O bonds formed in SO2 molecules? Are the two S-O bonds in this molecules equal?
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-
How is the presence of SO2 detected?
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-
Mention three areas in which H2SO4 plays an important role.
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-
Write the conditions to maximize the yield of H2SO4 by contact process.
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-
Why is less than
for H2SO4
in water?
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-
Considering the parameters such as bond dissociation enthalpy, electron gain enthalpy and hydration energy, compare the oxidizing power of F2 and Cl2.
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-
Give two examples to show the anomalous behaviour of fluorine.
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-
Sea is the greatest source of halogens. Comment.
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Give the reason for the bleaching action of Cl2.
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-
Name two poisonous gases which can be prepared from chlorine gas.
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-
Why is more reactive than
I2?
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-
Why is helium used in diving apparatus?
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-
Balance the
following equation
XeF6 + H2O
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-
Why has it been difficult to study the chemistry of radon?
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-
Discuss the general characteristics of group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.
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question_answer35)
On
addition of cone. to a chloride salt, colourless fumes are evolved but in
case of iodide salt, violet fumes come out. This is because
(a) reduces
HI to
(b) HI is of violet colour,
(c) HI gets oxidised to
(d) HI changes to
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question_answer36)
In
qualitative analysis when is passed through an aqueous solution of salt acidified
with dil. HCI, a black precipitate is obtained. On boiling the precipitate with
dil. , it forms a solution of blue colour. Addition of excess of
aqueous solution of ammonia to this solution gives..........
(a) deep blue precipitate of
(b) deep blue solution of
(c) deep blue solution of
(d) deep blue solution-of
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question_answer37)
In
a cydotrimetaphosphoric add molecule, how many single and double bonds are
present?
(a) 3 double bonds; 9 single bonds
(b) 6 double bonds; 6 single bonds
(c) 3 double bonds; 12 single bonds
(d) Zero double bond; 12 single bonds
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question_answer38)
Which
of the following-elements can be involved in pit-die bonding?
(a) Carbon (b) Nitrogen
(c) Phosphorus (d) Boron
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question_answer39)
Which
of the following pairs of ions are isoelectronic and isostructural?
(a) (b)
(c) (d)
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question_answer40)
Affinity
for hydrogen decreases in the group from fluorine to iodine. Which of the
halogen acids should have highest bond dissociation enthalpy?
(a) HF (b) HCl
(c) HBr (d) HI
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question_answer41)
Bond
dissociation enthalpy of E?H (E= element) bonds is given below. Which of the
compounds will act as strongest reducing agent?
(a) (b)
(c) (d)
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question_answer42)
On
heating with concentrated solution in an inert atmosphere of, white phosphorus
gives a gas. Which of the following statement is incorrect about the gas?
(a) It is highly poisonous and has smell like rotten fish
(b) It's solution in water decomposes in the presence of
light
(c) It is more basic than NN3
(d) It is less basic than NN3
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question_answer43)
Which
of the following acids forms three series of salts? ;
(a) (b)
(c) (d)
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question_answer44)
Strong
reducing behaviour of is due to
(a) low oxidation state of phosphorus
(b) presence of two ? OH groups and one P ? H bond
(c) presence of one?OH group and two P?H bonds
(d) high electron gain enthalpy of phosphorus
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question_answer45)
On
heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are..........
(a) (b)
(c) (d)
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question_answer46)
Which
of the following elements does not show allotropy?
(a) Nitrogen (b) Bismuth
(c) Antimony (d) Arsenic
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question_answer47)
Maximum
covalency of nitrogen is..........
(a) 3 (b) 5
(c) 4 (d) 6
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question_answer48)
Which
of the following statements is wrong?
(a) Single N?N bond is stronger than the single P?P bond.
(b) PH3 can act as a ligand in the formation of
coordination compound with transition elements.
(c) NO2 is paramagnetic in nature.
(d) Covalency of nitrogen in is
four.
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question_answer49)
A
brown ring is formed in the ring test for ion. It is due to the formation of
(a)
(b)
(c)
(d)
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question_answer50)
Elements
of group- 15 form compounds in +5 oxidation state. However, bismuth forms only
one well characterised compound in +5 oxidation state. The compound is
(a) (b)
(c) (d)
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question_answer51)
On
heating ammonium dichromate and barium azide separately we get
(a) in both cases
(b) with ammonium
dichromate and NO with barium azide
(c) with ammonium
dichromate and N^ with barium azide
(d) with ammonium
dichromate and NO; with barium azide
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question_answer52)
In
the preparation of NN03, we get NO gas by catalytic oxidation of ammonia. The
moles of NO produced by the oxidation of two moles of will be..........
(a) 2 (b) 3
(c) 4 (d) 6
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question_answer53)
The
oxidation state of central atom in the anion of compound will be...........
(a) + 3 (b) +5
(c) + 1 (d)-3
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question_answer54)
Which
of the following is not tetrahedral in shape?
(a) (b)
(c) (d)
It has trigonal bipyramidal geometry having hybridisation.
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question_answer55)
Which
of the following are peroxoacids of sulphur?
(a)
(b)
(c)
(d)
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question_answer56)
Hot
cone. acts as moderately strong oxidising agent. It oxidises both
metals and non-metals. Which of the following element is oxidised by cone. into
two gaseous products?
(a) Cu (b) S
(c) C (d) Zn
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question_answer57)
A
black compound of manganese reacts with a halogen acid to give greenish yellow
gas. When excess of this gas reacts with an unstable trihalide is formed. In this process the
oxidation state of nitrogen changes from..........
(a) -3 to + 3 (b) -3 to 0
(c) - 3 to + 5 (d)
0 to ? 3
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question_answer58)
In
the preparation of compounds of Xe, Bartlett had taken Pt as a base
compound. This is because
(a) both and Xe have
same size.
(b) both and Xe have
same electron gain enthalpy.
(c) both and Xe have
almost same ionisation enthalpy.
(d) both Xe and are gases.
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question_answer59)
In
solid state PCl5 is a..........
(a) covalent
solid
(b) octahedral structure
(c) ionic solid with octahedral
and tetrahedral
(d) ionic solid with tetrahedral
and octahedral
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question_answer60)
Reduction
potentials of some ions are given below. Arrange them in decreasing order of
oxidising power.
(a)
(b)
(c)
(d)
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question_answer61)
Which
of the following is isoelectronic pair?
(a) (b)
(c) (d)
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question_answer62)
If
chlorine gas is passed through hot solution, two changes are observed in the oxidation number
of chlorine during the reaction. These are ......... and.........
(a) 0 to +5 (b) 0 to +3
(c) 0 to -1 (d) 0 to +1
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question_answer63)
Which
of the following options are not in accordance with the property mentioned
against them?
(a) Oxidising
power
(b) Ionic
character of metal halide
(c) Bond dissociation enthalpy
(d) HI< HBr < HCI < HF Hydrogen-halogen bond
strength
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question_answer64)
Which
of the following is correct for P4 molecule of white phosphorus?
(a) It has 6 lone pairs of electrons
(b) It has six P?P single bonds
(c) It has three P ? P single bonds
(d) It has four lone pairs of electrons
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question_answer65)
Which
of the following statements are correct?
(a) Among halogens, radius ratio between iodine and
fluorine is maximum.
(b) Leaving F ? F bond, all halogens have weaker X ? X bond
than X ? X bond in interhalogens.
(c) Among interhalogen compounds maximum number of atoms
are present in iodine fluoride.
(d) Interhalogen compounds are more reactive than halogen
compounds.
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question_answer66)
Which
of the following statements are correct for SO2 gas?
(a) It acts as bleaching agent in moist conditions.
(b) Its molecule has linear geometry.
(c) Its dilute solution is used as disinfectant.
(d) It can be prepared by the reaction of dilute 1-12804
with metal sulphide.
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question_answer67)
Which
of the following statements are correct?
(a) All the three N ? 0 bond lengths in are equal.
(b) All P? Cl bond lengths in PCI5 molecule in
gaseous state are equal
(C) P4 molecule
in white phosphorus have angular strain therefore white phosphorus is very
reactive
(d) PCI5 is ionic in solid state in which cation
is tetrahedral and anion is octahedral.
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question_answer68)
Which
of the following orders are correct as per the properties mentioned against
each?
(a)
Acid strength.
(b)
Enthalpy of vaporisation.
(c)
More negative electron gain enthalpy.
(d)
Thermal stability.
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question_answer69)
Which
of the following statements are correct?
(a) S?S bond is present-in
(b) In peroxosulphuric acid sulphur
is in + 6 oxidation state
(c) Iron powder along with and
is used as a catalyst in the
preparation of by Haber's process
(d) Change in enthalpy is positive for the preparation of
803 by catalytic oxidation of
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question_answer70)
In
which of the following reactions cone. is used as an oxidizing reagent?
(a)
(b)
(c)
(d)
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question_answer71)
Which
of the following statements are true?
(a) Only type of interactions between particles of noble
gases are due to weak dispersion forces.
(b) lonisation enthalpy of molecular oxygen is very close
to that of xenon.
(c) Hydrolysis of is
a redox reaction.
(d) Xenon fluorides are not. reactive.
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question_answer72)
In
the preparation of by Contact process, why is not
absorbed directly in water to form?
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question_answer73)
Write
a balanced chemical equation for the reaction showing catalytic oxidation of by
atmospheric oxygen.
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question_answer74)
Write
the structure of pyrophosphoric acid.
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question_answer75)
PH3
forms bubbles, when passed slowly in water but NN3 dissolves. Explain why?
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question_answer76)
In
PCl5, phosphorus is in hybridised state but all its five bonds are not
equivalent. Justify your answer with .reason.
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question_answer77)
Why
is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling
it is diamagnetic?
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question_answer78)
Give
one reason to explain why CIF3 exists but FCl3 does not
exist?
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question_answer79)
Out
of and, which one has higher bond angle and why?
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question_answer80)
SF6
is known but SCl6 is not. Why?
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question_answer81)
On
reaction with Cl2, phosphorus forms two types of halides 'A' and 'S.
Halide 'A' is yellowish-white powder but halide 'S is colourless oily liquid. Identify
A and B and write the formulae of their hydrolysis products.
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question_answer82)
In
the ring test of ion, ion reduces nitrate ion to nitric oxide, which combines
with (aq) ion to form
brown complex. Write the reactions involved in the formation of brown ring.
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question_answer83)
Explain
why the stability of oxoacids of chlorine increases in the order given below.
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question_answer84)
Explain
why ozone is thermodynamically less stable than oxygen?
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question_answer85)
reacts with water according to equation Calculate
the volume of 0.1 M solution required to neutralise the acid formed by
dissolving 1.1 g of in .
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question_answer86)
White
phosphorus reacts with chlorine and the product hydrolyses in the presence of
water. Calculate the mass of HCl obtained by
the hydrolysis of the product formed by the reaction of 62 g of white
phosphorus with chlorine in the presence of water.
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question_answer87)
Name
three oxoacids of nitrogen. Write the disproportionation reaction of that
oxoacid of nitrogen in which nitrogen is in + 3 oxidation state.
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question_answer88)
Nitric
acid forms an oxide of nitrogen on reaction with.
Write the reaction involved. Also write the resonating structures of the oxide
of nitrogen formed.
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question_answer89)
Give
an example to show the effect of concentration of nitric acid on the formation
of oxidation product.
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question_answer90)
reacts with finely divided silver on heating and a white
silver salt is obtained, which dissolves on adding excess aqueous NN3 solution.
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question_answer91)
Write
the reactions involved to explain what happens.
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question_answer92)
Phosphorus
forms a number of oxoacids. Out of these oxoacids, phosphinic acid has strong
reducing property. Write its structure and also write a reaction showing its
reducing behaviour.
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question_answer93)
Match
the compounds given in Column I with the hybridisation and shape given in
Column II and mark the correct option.
Column I
|
Column II
|
A.
|
1. - distorted
octahedral
|
B.
|
2. - square
planar
|
C.
|
3. pyramidal
|
D.
|
4.square
pyramidal
|
Codes
A B C D A B C
D
(a) 1 3 4 2 (b) 1 2 4
3
(c) 4 3 1 2 (d) 4 1 2
3
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question_answer94)
Match
the formulas of oxides given in Column I with the type of oxide given in Column
II and mark the correct option.
|
Column I
|
|
Column II
|
A.
|
|
1,
|
Neutral oxide
|
B.
|
|
2.
|
Acidic oxide
|
C.
|
|
3.
|
Basic oxide
|
D.
|
|
4.
|
Mixed oxide
|
Codes
A B C D A B C D
(a) 1 2 3 4 (b) 4 1 2 3
(c) 3 2 4 1 (d) 4 3 1 2
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question_answer95)
Match
the items of Columns I and II and mark the correct option.
|
Column I
|
Column II
|
A. B. C. D.
|
Sulphur
|
1. Highest electron gain enthalpy
2. Chalcogen
3. Tear gas
4. Storage batteries
|
Codes
A B C D A B C D
(a) 4 3 1 2 (b) 3 4 1 2
(c) 4 1 2 3 (d) 2 1 3 4
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question_answer96)
Match
the species given in Column I with the shape given in Column I and mark the
correct option.
|
Column 1
|
Column 11
|
A.
|
|
1. Tetrahedral
|
B.
|
|
2. Pyramidal
|
C.
|
|
3. Sea-saw shaped
|
D.
|
|
4. Bent T-shaped
|
Codes
A B C D A B C D
(a) 3 2 1 4 (b) 3 4 2 1
(c) 1 2 3 4 (d) 1 4 3 2
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question_answer97)
Match
the items of Columns I and II and mark the correct option.
|
Column 1
|
Column 11
|
A.
|
Its partial hydrolysis does not change oxidation
state of central atom.
|
1. He
|
B.
|
It is used in modern diving apparatus.
|
2.
|
C.
|
It is used to provide inert atmosphere for
filling electrical bulbs.
|
3.
|
D.
|
Its central atom is in sp^d2
hybridisation.
|
4. Ar
|
Codes
A B C D A B C D
(a) 1 4 2 3 (b) 1 2 3 4
(c) 2 1 4 3 (d) 1 3 2 4
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question_answer98)
Assertion (A) N2 is less reactive than P4.
Reason (R) Nitrogen
has more electron gain enthalpy than phosphorus.
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question_answer99)
Assertion (A) makes iron passive.
Reason (R) forms a protective layer of ferric
nitrate on the surface of iron.
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question_answer100)
Assertion (A) cannot be prepared by the reaction of with
concentrated
Reason (R) has Lowest H?X bond strength
among halogen acids.
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question_answer101)
Assertion
(A) Both rhombic and monocline sulphur
exist as but
oxygen exists as .
Reason (R) Oxygen
forms multiple bond due to small size
and small bond length but bonding is not
possible in sulphur.
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question_answer102)
Assertion (A) reacts with concentrated to give colourless fumes with pungent smell. But on adding the
fumes become
greenish yellow.
Reason (R) oxidises HCl to chlorine gas which
is greenish yellow.
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question_answer103)
Assertion (A) SF6 cannot be hydrolysed butSF4 can be.
Reason (R) Six F-atoms
in SF6 prevent the attack of H2O on sulphur atom Of SF6.
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question_answer104)
An
amorphous solid "A" burns in air to form a gas "B" which
turns lime water milky. The gas is also produced as a by-product during
roasting of sulphide ore. This gas decolourises acidified aqueous solution
and reduces to. Identify the solid "A" and the gas "B"
and write the reactions involved.
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question_answer105)
On
heating lead (II) nitrate gives a brown gas "A". The gas "A"
on cooling changes to colourless solid "B". Solid "B" on
heating with NO changes to a blue solid 'C. Identify 'A', 'B' and 'C and also
write reactions involved and draw the structures of 'B' and 'C'.
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question_answer106)
On
heating compound (A) gives a gas (B) which is a constituent of air. This gas
when treated with 3 moles of hydrogen (H2) in the presence of a
catalyst gives another gas (C) which is basic in nature. Gas C on further Oxidation
in moist condition gives a compound (D) which is a part of acid rain. Identify
compounds (A) to (D) and also give necessary equations of all the steps involved.
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