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

(1) Carbogen is

[A] Pureform of C

[B] COC_l2

[C] Mixture of CO and CO₂

[D] O₂ & CO₂

Answer: O₂ & CO₂

(2) The products of the chemical reaction between Na2S2O3, Cl2 and H2O are

[A] S+ HCl + Na₂S

[B] S + HCl + Na₂SO₄

[C] S + HCl + Na₂SO₃

[D] S + NaCCO₃ + H₂O

Answer: S + HCl + Na₂SO₄

(3) The incorrect statement among the following is

[A] C₆₀ is an allotropic form of carbon

[B] O₃ is an allotropic form of oxygen

[C] S₈ is only allotropic form of sulphur

[D] Red phosphorous is more stable in air than while phosphorous

Answer: S₈ is only allotropic form of sulphur

(4) Hypo is used in photography because of its

[A] Reducing behavior

[B] Oxidising behavior

[C] Complex forming behavior

[D] Reaction with light

Answer: Complex forming behavior

(5) Aqueous solutions of H₂S and SO₂ when mixed together yield

[A] Sulphur and water

[B] Sulphur trioxide and water

[C] Hydrogen peroxide and sulphur

[D] Hydrogen and sulphurous acid

Answer: Sulphur and water

(6) An example of a neutral oxide is

[A] No

[B] CO₂

[C] CaO

[D] ZnO

Answer: No

(7) Which of the following is used to absorb sulphur dioxide

[A] conc H₂SO₄

[B] KOH Solution

[C] Water

[D] Anhydrous CaCl₂

Answer: KOH Solution

(8) When SO₂ is passed through acidified K₂Cr₂O₇ solution

[A] Solution turns blue

[B] Solution decolourizes

[C] SO₂ is reduced

[D] Green Cr₂(SO₄)₃ is formed

Answer: Green Cr₂(SO₄)₃ is formed

(9) Which of the following is oxidized by SO2

[A] Mg

[B] K₂Cr₂O₇

[C] KMnO₄

[D] All

Answer: Mg

(10) A salt of sulphurous acid is called

[A] Sulphate

[B] Sulphurate

[C] Sulphite

[D] Sulphid

Answer: Sulphite

(11) The final acid obtained during the manufacture of H₂SO₄ by contact process

[A] H₂SO₄(conc.)

[B] H₂SO₄(dil)

[C] H₂SO₄

[D] H₂S₂O₇

Answer: H₂S₂O₇

(12) Which compound acts as an oxidizing as well as reducing agent

[A] SO₂

[B] MnO₂

[C] Al₂O₃

[D] CrO₃

Answer: SO₂

(13) Bleaching action of SO2 is due to

[A] Reduction

[B] Oxidisation(oxide)

[C] Hydrolysis

[D] Acidic nature

Answer: Reduction

(14) About H₂SO₄ which is incorrect

[A] Reducing agent

[B] Dehydrating agent

[C] Sulphonating agent

[D] Highly Viscous

Answer: Reducing agent

(15) In the reaction
2Ag + 2H₂SO₄ → Ag₂ SO₄ + 2H₂O + SO₂, H₂SO₄ acts as

[A] Reducing agent

[B] Oxidising agent

[C] Catalytic agent

[D] Dehydrating agent

Answer: Oxidising agent

(16) Which element is found in free state

[A] I

[B] S

[C] Ur

[D] Ag

Answer: S

(17) In the preparation of sulphuric acid, V₂O₅ is used is the reaction, which is

[A] S + O₂ → SO₂

[B] 2SO₂ + O₂ →2SO₃

[C] SO₂ + H₂O → H₂SO₄

[D] N₂ + 3H₂ → 2NH₃

Answer: 2SO₂ + O₂ →2SO₃

(18) Point out of in which of the following properties of oxygen differs from the rest of the members of its family (Group - VIA)

[A] High value of ionization energy

[B] Oxydation state (2,4,6)

[C] Polymorphism

[D] Formation of hydrides

Answer: Oxydation state (2,4,6)

(19) Ozone turns trimethyl paper

[A] Green

[B] Violet

[C] Red

[D] Black

Answer: Violet

(20) No of atoms in one molecules of sulphur is

[A] 8

[B] 4

[C] 3

[D] 5

Answer: 8

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

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