JAMB Past Questions and Answers - Page 1187

5,931.

An instrument which allows public officers to increase expenditure within a year is

A.

Statutory allocation

B.

Supplementary budget

C.

Virement

D.

Warrant

Correct answer is B

Supplementary Budget is the request for additional funds by Ministries and Departments during the course of the year.

5,932.

An organic functional group which can likely decolorize ammoniacal silver nitrate is?

A.

alkene

B.

alkane

C.

alkyne

D.

alkanol

Correct answer is C

Terminal alkynes react with Tollens reagent (ammoniacal silver nitrate solution) to form silver alkynides as a white precipitate, whereas internal alkynes do not react with Tollens reagent.

5,933.

Zn + 2HCL → ZnCl\(_2\) + H\(_2\) 

What happens to zinc in the above reaction?

A.

oxidized

B.

a reactant

C.

reduced

D.

a metal

Correct answer is A

-Zn is a reducing agent, HCl is an oxidizing agent.

-the zinc is oxidized

5,935.

N\(_2\)O\(_4\) ⇔ 2NO\(_2\)          (Δ = -ve)

From the reaction above, which of these conditions would produce the highest equilibrium yield for N\(_2\)O\(_4\)?

A.

Low temperature and high pressure

B.

Low temperature and low pressure

C.

high temperature and low pressure

D.

high temperature and high pressure

Correct answer is D

high temperature and high pressure favor the highest yield for N\(_2\)O\(_4\)

high temperature favours the production of the reactant since it is endothermic, while high pressure favours the side involving a decrease in volume.