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Free download in PDF Objective Type Questions and Answers on Class 12 Chemistry Chapter 7 p Block Elements for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
Tincture of iodine is
[A]
Aq. Sol. of I2
[B]
Solution of I2 in Aq. KI
[C]
Alc. Sol. in I2
[D]
Aq. Sol. of KI
(2)
HBr & HI reduce Sulphuric acid, HCl can reduce KMnO4 & HI can reduce
[A]
H2SO4
[B]
KMnO4
[C]
K2Cr2O7
[D]
None
(3)
Hydrogen bonding is present in
[A]
HF
[B]
HCl
[C]
HBr
[D]
HI
(4)
Which one of following orders is not proper
[A]
F2 > Cl2 > Br2 > I2 : Electronegativity
[B]
F2 > Cl2 > Br2 > I2 : Bond dissociation energy
[C]
F2 > Cl2 > Br2 > I2 : Oxidising power
[D]
HI > HBr > HCl > HF : Acidic property in water
Answer: F2 > Cl2 > Br2 > I2 : Bond dissociation energy
(5)
Which of following chemicals contains chlorine?
[A]
Fisc her salt
[B]
Epsom salt
[C]
Fremy's salt
[D]
Spirit of salt
(6)
The halide NaF has high melting point than NaCl , NaBr, & NaI because
[A]
Minimum ionic character
[B]
Maximum ionic character
[C]
Highest oxidizing power
[D]
Lowest polarity
Answer: Maximum ionic character
(7)
Effective component of bleaching powder is -
[A]
Cl
[B]
Br
[C]
Al
[D]
Ca
(8)
Which of following is prepared by electrolytic method?
[A]
Ca
[B]
Sn
[C]
S
[D]
F2
(9)
Chlorine dioxide is best prepared by passing dry
[A]
Cl . gas over hot HgO
[B]
Cl & O2 gas overhot pt . catalyst
[C]
Chlorine over hot silver chromate
[D]
None of above
Answer: Chlorine over hot silver chromate
(10)
Which one of following in aqueous solution gives a white precipitate with per chloric acid
[A]
NaCl
[B]
KCl
[C]
MgCl2
[D]
FeCl3
(11)
NOCl is used as a bleaching agent & storilisng agent It can be synthesized by action of
[A]
NaCl with H2O
[B]
NH4Cl with NaOH
[C]
Cl2 with cold & dilute NaOH
[D]
Cl2 with hot & Conc. NaOH
Answer: Cl2 with cold & dilute NaOH
(12)
A one litre flask is full of brown bromine vapour intensity of brown colour of vapour will not decrease a appriciable on adding to flask some of
[A]
Pieces of marble
[B]
Carbon disulphide
[C]
Carbon tetrachloride
[D]
Animal Charcoal Powder
(13)
Which of following statement is correct?
[A]
Only Cl & Br forms Oxyacids
[B]
all halogen form oxyacid
[C]
All halogen except F. form oxyacid
[D]
Only iodine form oxyacid
Answer: All halogen except F. form oxyacid
(14)
A mixture of ZnCl2 & PbCl2 can be separated by
[A]
Distillation
[B]
Crystallization
[C]
Sublimation
[D]
Adding acetic acid
(15)
Hydrogen has a tendency to gain one e– to acquire helium configuration. In this respect it resembles.
[A]
Halogens
[B]
Actinides
[C]
Transition metals
[D]
Alkali metals
(16)
The compound added to table salt for maintaining proper health is
[A]
KCl
[B]
KBr
[C]
NaI
[D]
MgBr2
(17)
Which of following halogen can be purified by sublimation?
[A]
F2
[B]
Cl2
[C]
Br2
[D]
I2
(18)
Which statement is not true ?
[A]
Ni(CO)4 is diamagnetic
[B]
BI3 is strong Lewis acid than BF3
[C]
Graphite conducts electricity where as diamond does not
[D]
CCl4 is hydrolysed where as BCl3 is inert
Answer: CCl4 is hydrolysed where as BCl3 is inert
(19)
Bleaching Powder loser its power On keeping for long time because
[A]
It changes to calcium hypochlorate
[B]
It changes to calcium chloride & calicium hydroxide
[C]
It absorbs moisture
[D]
It changes to CaCl2 & calcium chlorate
Answer: It changes to CaCl2 & calcium chlorate
(20)
Compound that forms dative bond with ammonia
[A]
CCl4
[B]
BCl3
[C]
MgCl2
[D]
NaCl
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