Class 12 Chemistry Chapter 7 p Block Elements MCQs | Objective Type Questions and Answers on Class 12 Chemistry Chapter 7 p Block Elements

Questions
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

Answer:Alc. Sol. in I2
2 HBr & HI reduce Sulphuric acid, HCl can reduce KMnO4 & HI can reduce
A H2SO4
B KMnO4
C K2Cr2O7
D None

Answer:None
3 Hydrogen bonding is present in
A HF
B HCl
C HBr
D HI

Answer:HF
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

Answer: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

Answer:Cl
8 Which of following is prepared by electrolytic method?
A Ca
B Sn
C S
D F2

Answer: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

Answer: KCl
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

Answer: Pieces of marble
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

Answer:Crystallization
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

Answer:Halogens
16 The compound added to table salt for maintaining proper health is
A KCl
B KBr
C NaI
D MgBr2

Answer: NaI
17 Which of following halogen can be purified by sublimation?
A F2
B Cl2
C Br2
D I2

Answer: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

Answer: BCl3

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