A solution of a salt X reacts with AgNO₃ solution to give white precipitate which dissolves in excess aqueous ammonia. X contains

A. CI^-

B. Pb ²⁺

C. SO ^2-

D. Zn²⁺

Consider the reaction represented by the following equation: N_2(g) + 3H_2(g) ⇌ 2NH_3(g); ∆H = - 92kJmol¹. Finely divided iron is used as catalyst in the reaction in order to

A. lower the value of ∆H

B. increase the time for attainment of equilibrium

C. shorten the time for attainment of equilibrium

D. decrease the yield of ammonia

Which of these cell notations is the correct representation of a Daniell cell?

A. Zn_(s) / Zn²⁺_{(aq) // Cu^2+(aq)/Cu(s)}

B. Cu_(s) / CU^{2+_(aq) // Zn2+_(aq) / Zn_(s)}

C. Zn²⁺_(aq) / Zn_(s) // Cu²⁺_(aq) /Cu_(s)

D. Cu²⁺_(aq) / Cu_(s) // Zn_(s) / Zn²⁺_(aq)

What is the oxidation number of chromium in K₂CrO₄?

A. +1

B. +2

C. +4

D. +6

What product is formed at the cathode during the electrolysis of concentrated sodium chloride solution using carbon electrodes?

A. Chlorine

B. Hydrogen

C. Oxygen

D. Sodium

Which of the following substances is suitable solvent for perfumes?

A. Benzene

B. Ethanol

C. Turpentine

D. Water

The complete hydrogenation of C ₆
H ₆ in the presence of nicked catalyst at 200^oC gives

A. C₆H₈

B. C ₆H₁₀

C. C ₆H ₁₂

D. C ₆H ₁₄

Which of the following pairs of substances can be distinguished by use of NaHCO₃ solution?

A. CH ₃CH₂OH and HCOOCH₃

B. CH ₃CH₂OH and CH₃COOH

C. CH₃COOH and HCOOH

D. CH ₃CH₂OH and CH₃OH

Alkenes undergo the following reactions except

A. addition

B. hydration

C. polymerization

D. substitution

Hydrocarbons which react with ammoniacal copper (l) chloride solution conform to the general molecular formula

A. C_nH_2n

B. C_nH_2n

C. C_nH_2n+2

D. C_nH_2n-2