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

(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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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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