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

Questions
1 On heating NaCl + K2 Cr2O7 + Conc. H2SO4, we get
A O2
B Cl2
C CrOCl2
D CrO2Cl2

Answer:CrO2Cl2
2 Amongst LiCl , RbCl , BeCl2 & MgCl2 , max. & min. ionic character will be shown by
A LiCl , MgCl2
B RbCl , BeCl2
C RbCl , MgCl2
D MgCl2,BeCl2

Answer: RbCl , BeCl2
3 Which of following chloride is water insoluble
A HCl
B AgCl
C both 'a' & b
D None

Answer:AgCl
4 The alkali metal halide are soluble in water but LiF is insoluble because
A It's Amphoteric
B Li -F is highly ionic
C It's Lattice energy is high
D Li+ ion is least hydrated

Answer:It's Lattice energy is high
5 Which of following is present as an active ingredient in bleaching powder for bleaching action
A CaCl2
B CaOCl2
C Ca(OCl)2
D CaO2Cl

Answer: Ca(OCl)2
6 ClO2 reacts with O3 to give
A Cl2O4
B Cl2O
C Cl2O6
D ClO4

Answer: Cl2O6
7 Bad conductor Of electricity is
A H2F2
B HCl
C HBr
D HI

Answer: H2F2
8 When KBr is treated with concentrated H2SO4 redish brown gas evolved, gas is
A Mixture of Br & HBr
B Bromine & HNO3
C Bromine
D None of these

Answer:Bromine
9 Which of following outter electronic configuration represents Ar?
A ns2
B ns2 np6
C ns2 np5
D ns2 np4

Answer:ns2 np6
10 Which mineral was used in isolation of radium?
A Lime stone
B Pitch blende
C Rectile
D Haematite

Answer: Pitch blende
11 Molecules of noble gas do not posses vibrational energy bec. Noble gas is
A Monoatomic
B Chemically inert
C Complete filled shells
D Is diatomic

Answer:Monoatomic
12 Argon was discovered by
A Rayleigh
B Frankland & Lockyer
C Jansen
D Ramsay

Answer: Ramsay
13 The colour discharge tubes for advertisement mainly contain
A Argon
B Neon
C Helium
D Xenon

Answer: Helium
14 Least chemical activity is shown by
A Nitrogen
B Argon
C Methane
D Xenon

Answer:Argon
15 Noble gases do not react with other elements because
A They have completely paired up & stable e - configuration
B Their size is very small
C Are monoatomic
D None of these

Answer:They have completely paired up & stable e - configuration
16 Monazite is source of
A He
B Kr
C Ar
D Ne

Answer:He
17 He is added to oxygen supply used by deep sea divers because
A It's less soluble in blood than Nitrogen at high pressure
B It is Lighter than Nitrogen
C It is readily miscible in oxygen
D It is less poisionous than Nitrogen

Answer:It's less soluble in blood than Nitrogen at high pressure
18 Which of following is not correct for noblegas?
A Ar is used in electric bulbs
B Kr is obtained during radioactive disintegration
C Half life of Rn is 3.8 days
D He is used to produce Low temp

Answer:Kr is obtained during radioactive disintegration
19 Which of following represents noble gas configuration.
A 1S2, 2S2 2P6, 3S2 3P5
B 1S2, 2S2 2P6, 3S2 3P6
C 1S2, 2S2 2P6
D 1S2 , 2S2

Answer:1S2, 2S2 2P6, 3S2 3P6
20 Which of following has zero valency
A Sodium
B Beryllium
C Aluminium
D Krypton

Answer:Krypton

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