Class 12 Chemistry Chapter 7 p Block Elements MCQs | Class 12 Chemistry Chapter 7 p Block Elements Very Short Questions with Answers

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Questions
1 Ammonia gas can be collected by the displacemet of
A Conc. H2SO4
B Brine
C Water
D Mercury

Answer:Mercury
2 The chemical used for cooling in refrigeration is
A CO2
B NH4OH
C NH4Cl
D Liquid NH3

Answer:Liquid NH3
3 Reaction of PCl3 and PhMgBr. Would give
A Bromobanzene
B Chlorobenzene
C Triphenyl phosphine
D Dichlorobenzene

Answer:Triphenyl phosphine
4 Which of the following P is most stable
A Red
B White
C Black
D All stable

Answer:Red
5 The least stable hydride of 75th group elements in
A NH3
B PH3
C AsH3
D BiH3

Answer: BiH3
6 The chemical formula of Tear gas is
A COCl2
B CO2
C Cl2
D CCl3NO2

Answer: CCl3NO2
7 PH4I + NaOH forms
A PH3
B NH3
C P4O6
D P4O10

Answer:PH3
8 Which is not an acid salt
A NaH2PO3
B NaH2PO2
C Na3HP2O6
D Na4P2O7

Answer:Na4P2O7
9 The number of hydroxyl group in pyrophosphoric acid is
A 3
B 4
C 5
D 6

Answer: 4
10 Which of the following has the highest proton affinity
A Stilbine
B Arsine
C Phosphine
D Ammonia

Answer: Ammonia
11 Which of the following has highest B.P
A NH3
B PH3
C AsH3
D SbH3

Answer: SbH3
12 Which of the following exihibits highest solubility in H2O
A NH3
B PH3
C AsH3
D SbH3

Answer:NH3
13 HNO3 in aqueous solution yields
A NO3- and H+
B NO3- and H3O+
C NO2- and OH-
D N2O5 and H2O

Answer: NO3- and H3O+
14 The three important oxidation state of P are
A -3, +3, +5
B -3, +3, -5
C -3, +4, -4
D -3,+3,+4

Answer:-3, +3, +5
15 Which show maximum valency
A P
B Tin
C Sb
D Bi

Answer:P
16 Which oxide of N is obtained on heating ammonium nitrate at 250°C
A Nitric oxide
B Nitrous oxide
C Nitrogen dioxide
D Dinitrogen oxide

Answer:Nitrous oxide
17 The number of P-O-P bonds in cyclic metaphos phoric acid is
A 0
B 2
C 3
D 4

Answer:3
18 The product oblained by heating (NH4)2SO4 and KCNO is
A Hydrocyanic acid
B Ammonia
C Ammonium cyanide
D Urea

Answer:Urea
19 Which compound is related to haber’s process
A CO2
B H2
C NO2
D NH3

Answer:NH3
20 The carbonate which does not leave a residue on heating is
A Na2CO3
B PH3
C SbH3
D AsH3

Answer:Bi2O2

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