General Knowledge Questions with Answers on Class 12 Chemistry Chapter 7 p Block Elements | Class 12 Chemistry Chapter 7 p Block Elements Quiz

(1) Bond angle is minimum for

[A] H₂O

[B] H₂S

[C] H₂Se

[D] H₂Te

Answer: H₂Te

(2) A solution of SO₂ in water reacts with H₂S precipating sulphur. Here SO₂ acts as

[A] Oxidising agent

[B] Reducing agent

[C] Acid

[D] Catalyst

Answer: Oxidising agent

(3) Whe SO₂ is passed through cupric chloride solution

[A] White precipitate is obtained

[B] Solution becomes colouless

[C] Solution becomes colourless & White ppt is obtained of Cu₂Cl₂

[D] No Change

Answer: Solution becomes colourless & White ppt is obtained of Cu₂Cl₂

(4) Which of the following is acidic

[A] SO₃

[B] N₂O

[C] BeO

[D] HgO

Answer: SO₃

(5) Which of the elements listed below occurs in allotropic forms

[A] Iodine

[B] Copper

[C] Sulphur

[D] Silver

Answer: Sulphur

(6) Oxygen was discovered by

[A] Priestly

[B] Scheele

[C] Boyle

[D] Cavendish

Answer: Priestly

(7) Shape of O₂F₂ is similar to that of

[A] C₂F₂

[B] H₂O₂

[C] H₂F₂

[D] C₂H₂

Answer: H₂O₂

(8) Which of the following is not a chalcogen

[A] O

[B] S

[C] Se

[D] Na

Answer: Na

(9) Which of the following is a suboxide

[A] Ba₂O

[B] Pb₂O

[C] C₃O₂

[D] ZnO

Answer: C₃O₂

(10) KO₂ + CO₂ → ? (gas)

[A] H₂

[B] N₂

[C] O₂

[D] CO

Answer: O₂

(11) H₂SO₄ acts as dehydrating agent in its reaction with

[A] H₂C₂O₄

[B] Ba(OH)₂

[C] KOH

[D] Zn

Answer: H₂C₂O₄

(12) A gas that can not be collected over water is

[A] N₂

[B] O₂

[C] SO₂

[D] PH₃

Answer: SO₂

(13) The molecular formula of dithionic acid is

[A] H₂S₂O₄

[B] H₂S₂O₆

[C] H₂S₂O₅

[D] H₂S₂O₇

Answer: H₂S₂O₆

(14) Oxygen is not evolved on reaction of ozone with

[A] H₂O₂

[B] SO₂

[C] Hg

[D] KI

Answer: SO₂

(15) α and β form of sulphur both are stable at

[A] 369^oC

[B] 369K

[C] 4^oC

[D] 0^oC

Answer: 369K

(16) SO₂ + H₂S → X The final product is

[A] H₂O + S

[B] H₂SO₄

[C] H₂SO₃

[D] H₂S₂O₃

Answer: H₂O + S

(17) Sulphur in +3 oxidation state is present in

[A] Sulphurous acid

[B] Pyrosulphuric acid

[C] Dithionous acid

[D] Thiosulphuric acid

Answer: Dithionous acid

(18) H₂S is not a/an

[A] Reducing agent

[B] Acidic

[C] Oxidising agent

[D] None

Answer: Oxidising agent

(19) Which one of the following is non-reducing

[A] H₂Se

[B] H₂Te

[C] H₂S

[D] H₂O

Answer: H₂O

(20) When PbO₂ reacts with conc. HNO₃ the gas evolved is

[A] NO₂

[B] O₂

[C] N₂

[D] N₂O

Answer: O₂

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

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