question_answer1)
What is the inert pair effect?
question_answer3)
On being slowly passed through
water, 
form bubble but 
dissolves. Why is it so?
question_answer4)
Write the structure of
pyrophosphoric acid.
question_answer5)
What is the state of
hybridisation of N in 
ion?
question_answer7)
Why 
is
not particularly reactive?
question_answer8)
Give reason : The maximum number
of covalent bonds formed by nitrogen is 4.
question_answer9)
What is the difference between
the 
bonds present in 
and 
molecules?
question_answer10)
Mention one property of
hydrazine.
question_answer11)
Why is
a good complexing agent?
question_answer12)
readily
forms dimer. Explain.
question_answer14)
Why is nitrogen a gas whereas
phosphorus is solid?
question_answer15)
is
liquid while 
is gas at room temperature. Give
reason.
question_answer16)
Which has the large bond angle or
question_answer18)
Why does oxygen not show an
oxidation state of + 4 and + 6 like sulphur?
question_answer19)
Write two uses of elemental
selenium.
question_answer20)
How is bonding in 
different?
question_answer21)
Write an example of neutral
molecule which is iso - electronic with 
question_answer22)
What are allotropes of sulphur?
question_answer23)
Explain why oxygen is a gas
while sulphur is a solid?
question_answer24)
What is the shape of 
molecule?
question_answer25)
Sulphur disappears when boiled
with sodium sulphite. Why?
question_answer26)
Which of the three is the
strongest oxidising agent : 
question_answer28)
Give an example of compound in
which chlorine is in + 7 oxidation state.
question_answer29)
In inter halogen compounds of
the type AB, and AB r is
invariably fluorine. Why?
question_answer30)
What is freon?
question_answer31)
What are halogens, why are they
called so?
question_answer32)
Which halogen is radioactive?
question_answer33)
Why is bond dissociation energy
ofF^ smaller than 
question_answer34)
Why 
is
more soluble in KI than in water?
question_answer35)
Name the oxide of chlorine used
in paper pulp?
question_answer36)
Why is covalent bonding of
halogen always sigma bonding?
question_answer37)
Among halogen hydrides which has
maximum ionic character?
question_answer38)
Why is HF not stored in glass
bottles?
question_answer39)
What happens when 
is hydrolysed?
question_answer40)
Which compound led to the
discovery of compounds of noble gas.
question_answer41)
Name the geometry of 
and 
question_answer42)
What are clathrate compounds of
noble gas?
question_answer43)
Noble gases have largest radii.
Explain.
question_answer44)
Why He is used in inflating
aeroplane tyres?
question_answer45)
Xe forms compound but Kr doesn't
why?
question_answer46)
Why do noble gases exist as
monoatomic species?
question_answer47)
Why 
is weaker base than 
question_answer48)
Explain why phosphorus forms 
while nitrogen does not form
question_answer49)
is planar but 
pyramidal, why?
question_answer50)
Arrange 
in
increasing ionic character. Give reason.
question_answer51)
Complete the reactions :
(i)
(ii)
(iii)
question_answer52)
Why is 
diprotic?
question_answer53)
Why does nitrogen show anomalous
behaviour?
question_answer54)
Acidity of oxoacids of nitrogen
increases with increase in oxidation state, why?
question_answer55)
Why all the bonds of 
molecule are not equivalent?
question_answer56)
Explain the hybridisation of 
molecule. What is the shape of this
molecule?
question_answer57)
Arrange the following in
increasing order of boiling points 
question_answer59)
Give reason why + 5 oxidation
state of Bi is less stable than + 3 state?
question_answer60)
Why are halogens coloured?
Explain.
question_answer61)
Arrange halogens in increasing
order of electron affinity.
question_answer62)
Why does fluorine show abnormal
behaviour?
question_answer63)
Special methods are used to
prepare HBr and HI why?
question_answer65)
Write the chemistry of etching
of glass.
question_answer66)
Why are inter halogen compounds
more reactive than its elemental form?
question_answer67)
Compare giving reason why
fluorine is stronger oxidizing agent than chlorine?
question_answer68)
Write the chemical reaction to
show the formation of from bleaching powder?
question_answer69)
Complete the reactions :
(i)
(ii)
(iii)
(iv)
question_answer70)
Give the structure of 
question_answer71)
How is 
prepared?
Give chemical reaction.
question_answer72)
What prompted Bartlett to
discover noble gas compounds?
question_answer73)
Give two uses of noble gases.
question_answer74)
Account for the following :
has
higher bond dissociation energy than NO.
question_answer79)
Complete the reaction :
(i)
(cold & dil.)
(ii)
(hot & conc.)
(iii)
(Hot)
question_answer80)
Discuses two similar and two dissimilar
properties of nitrogen and phosphorus?
question_answer81)
Write balanced equation of
following reaction
(i)
(ii)
question_answer82)
Why HF is a weaker acid than HI?
question_answer84)
38. (i) 
is coloured but 
is colourless.
(ii) 
question_answer111) Why
is \[{{H}_{2}}S\] less acidic than \[{{H}_{2}}Te\]?
question_answer112)
Oxygen
molecule has the formula \[{{O}_{2}}\] while sulphur is \[{{S}_{8}}\]why?
question_answer113)
Explain
why both N and Bi do not form pentahalides while phosphorus does.
question_answer115) On
addition of ozone gas to KI solution, violet vapours are obtained. Why?
question_answer116) Chlorine
water has both oxidizing as well as bleaching properties? Explain.
question_answer118) Why
does nitric oxide become brown when released in air?
question_answer121) Ammonia
acts as a ligand. Discuss.
question_answer122) Why
is neon used in illuminating warning signal. Why?
question_answer124) Ammonia
has a higher proton affinity than phosphine. Discuss.
question_answer125) Oxides
of phosphorus have cage like and not open structures. Explain.
question_answer127) Helium
and neon do not form compounds with fluorine. Assign reason.
question_answer128) Noble
gas elements form compounds only with fluorine and oxygen. Explain.
question_answer129) The
group of noble gas elements is called zero group. Why?
question_answer132) Ferric
iodide is very unstable but ferric chloride is stable. Explain.
question_answer134) HF
is not stored in glass bottles but is kept in wax bottles. Assign reason.
question_answer136) Inter
halogen compounds are more reactive than halogens. Why?
question_answer137) \[Cl{{F}_{3}}\] exists but \[FC{{l}_{3}}\]
does not. Why?
question_answer138)
\[P{{F}_{5}}\] is known but \[N{{F}_{5}}\]
is not known. Discuss.
question_answer139) Molecular
nitrogen is very inert chemically. Why?
question_answer142) \[{{H}_{2}}S\]is
a stronger acid than \[{{H}_{2}}O,\] Explain.
question_answer143) Sulphur
vapours exhibit some paramagnetic behaviour. Explain.
question_answer145) Why
is iodine more soluble in KI solution than in water?
question_answer147) Bond
angle in \[{{H}_{2}}S\] is lower than in \[{{H}_{2}}O\]. Justify.
question_answer149)
Oxygen
does not show oxidation states of + 4 and + 6 like sulphur. Explain.
question_answer153) Sulphur
dioxide acts as bleaching agent in the presence of moisture. Discuss.
question_answer154) Sulphur
is a solid while oxygen is a gas at room temperature Why?
question_answer159) All bonds in the molecule of \[PC{{l}_{5}}\] are not equivalent. Explain.
question_answer160) \[PC{{l}_{5}}\]acts
as a chlorinating agent in organic reactions. Why?
question_answer162) \[{{H}_{3}}P{{O}_{3}}\]is
a diprotic acid. Justify.
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(ii) Write chemical
reaction to show 
(ii) 
(ii) White
phosphorus is much more reactive than red phosphorus.
(iii) Bleaching
of flowers by 
