The ionic bond is formed by: MCQ with Answer and Explanation

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The ionic bond is formed by:

A. Sharing of protons

B. Complete transfer of electrons

C. Sharing of electrons by one atom only

D. Mutual sharing of electrons

Answer: Option B

Solution (By JKSSB Mock Tests)

Ionic (electrovalent) bond is formed by complete transfer of one or more valence electrons from a metal (low ionization energy) to a non-metal (high electron affinity), resulting in oppositely charged ions held by electrostatic forces. Example: Na → Na⁺ + e⁻; Cl + e⁻ → Cl⁻; Na⁺Cl⁻. Covalent bond involves sharing. Coordinate bond involves donation.

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Question #1

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Vulcanization of rubber involves heating with:

A. Carbon

B. Nitrogen

C. Sulfur

D. Oxygen

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Correct Answer: Option C

Explanation:
Vulcanization cross-links rubber polymer chains with sulfur bridges, improving elasticity, strength, and durability. Invented by Charles Goodyear. It converts raw rubber into useful form.

This question belongs to: Science chemistry

Question #2

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Assertion (A): Dry HCl gas does not change the color of dry litmus paper. Reason (R): Acids produce H⁺ ions only in the presence of water.

A. A is false but R is true.

B. Both A and R are true and R is the correct explanation of A.

C. A is true but R is false.

D. Both A and R are true but R is NOT the correct explanation of A.

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Correct Answer: Option B

Explanation:
The acidic behavior of HCl is due to the presence of H⁺ (or H₃O⁺) ions, which are generated only when it dissolves in water. Without moisture, HCl doesn't dissociate to produce H⁺, so it doesn't change the color of dry litmus. Both statements are correct and R explains A.

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Question #3

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Which of the following is NOT a method of concentration of ore?

A. Leaching

B. Smelting

C. Froth flotation

D. Magnetic separation

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Correct Answer: Option B

Explanation:
Smelting is a reduction process, not concentration. Concentration (beneficiation) methods include gravity separation, magnetic separation, froth flotation, and leaching (chemical). Smelting involves heating concentrated ore with a reducing agent to extract metal. For example, hematite concentrated by washing, then smelted in blast furnace.

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