Which of the following substances decomposes when an electric current is passed through it?

A. Glucose solution

B. Zinc rod

C. Hydrochloric acid

D. Tetrachlormethane

A concentrated solution containing H⁺, Cu²⁺,OH^- and CI^- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?

A. H⁺

B. Cu²⁺

C. OH^-

D. CI^-

Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?

A. S + P⁺ → P + S ⁺

B. Q + S⁺ → S + Q⁺

C. R + P⁺ → P + R⁺

D. S + Q⁺ → Q + S⁺

In the electrolysis of CuSO_4(aq) using copper electrodes, the reaction at the anode is

A. discharge of SOsub>4 ^2-

B. discharge of OH^-

C. dissolution of copper electrode

D. evolution of oxygen

A feasible cell was constructed by joining the two half cells below.
Cu²⁺ _(aq) + 2e- → Cu_(s) E^o = - 0.76 V. What is the standard e.m.f. of the cell?

A. - 1.1V

B. - 0.42V

C. +0.42V

D. +1.1V

Hydrogenation of butene yields

A. butyne

B. butane

C. pentence

D. butanol

Benzene produces more soot than ethene on burning because benzene

A. has a higher molar mass

B. has a higher degree off unsaturation

C. undergoes substitution and addition reaactions

D. is a liquid at room temperature

One of the products of combustion of pentane in excess air is

A. pentanol

B. pentene

C. nitrogen (ll) oxide

D. carbon (IV) oxide

Which of the following polymers contains nitrogen?

A. Nylon

B. Polyvinyl chloride

C. Polyethene

D. Cellulose

What is the function of H₂SO₄ in the following reaction? C₁₂
H₂₂O₁₁ conc. H₂4 12C + 11H₂O

A. Oxidizing agent

B. Strong acid

C. Dehydrating agent

D. Catalyst