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

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Questions
1 Bleaching action of bleaching powder is due to liberation of
A Chlorine
B Molecular oxygen
C Nascent oxygen
D Calcium carbonate

Answer:Nascent oxygen
2 What products are expected from disproportion reaction of hypochlorous acid.
A HClO3 & Cl2O
B HClO2 & HClO4
C HCl & Cl2O
D HCl & HClO3

Answer:HCl & HClO3
3 Mixture of conc. HCl & HNO3 made in 3:1 ratio contains
A ClO2
B NOCl
C NCl3
D N2O4

Answer:NOCl
4 I–|3| is used for treatment of
A Thyroid disorders
B Skin disorders
C Brain tumours
D Kidney stones

Answer:Thyroid disorders
5 Least reactive halogen with hydrogen is
A Cl
B I
C Br
D F

Answer:I
6 Bleaching action of chlorine is due to
A Oxidation
B Reduction
C Hydrolysis
D Its acidic nature

Answer: Oxidation
7 Which among following non metals is liq at 25°C
A Br
B C
C P
D S

Answer: Br
8 Element that librates oxygen gas from water is
A P
B Na
C F
D I

Answer:F
9 On exciting Cl2 molecule by UV Light , we get
A Cl
B Cl+
C Cl–
D All

Answer: Cl
10 Which of following sequence is correct with refrence to oxidation number of iodine
A I2 < ICl < HI < HIO4
B HIO4 < ICl <  I2 < HI
C   I2 < HI < ICl < HIO4
D HI <  I2 < IC < HIO4

Answer: HI <  I2 < IC < HIO4
11 What is obtained on reacting HgCl2 & Hg(CN)2
A (CN)2
B addition compound HgCl2. Hg(CN)2
C Hg(CN) Cl
D Hg [Hg(CN)2Cl2]

Answer: addition compound HgCl2. Hg(CN)2
12 Chlorine is liberated when we heat
A KMnO4 + NaCl
B K2 Cr2O7 + MnO2
C Pb2 (NO3)4 + MnO2
D K2 Cr2O7 + HCl

Answer:K2 Cr2O7 + HCl
13 Metal halide, insoluble in water is
A AgI
B KBr
C CaCl2
D AgF

Answer: AgI
14 Which of following oxides is expected exhibit paramagnetic behaviour
A CO2
B SO2
C ClO2
D SiO2

Answer:ClO2
15 Iodine dissolver readily in
A Water
B Potassium iodide
C CCl4
D Alcohol

Answer:CCl4
16 Cl2 reacts with CS2 in presence of I2 to form
A CHCl3
B CCl4
C C2H5Cl
D C2H6

Answer:CCl4
17 Bleaching powder is
A CaOCl2
B CaO
C CaO(Cl)
D CaCl(OCl)

Answer:CaCl(OCl)
18 Bleaching powder is obtained by treating chlorine with
A CaO
B CaCO3
C CaSO4
D Ca(OH)2

Answer:Ca(OH)2
19 Which is formed when F reacts with hot & conc. Sodium Hydroxide.
A O2
B O3
C NaO
D HF

Answer:O2
20 Bromine water reacts with SO2 to form
A H2O & HBr
B H2SO4 & HBr
C HBr & S
D S & H2O

Answer:H2SO4 & HBr

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