Chemistry Past Questions and Answers

Calculate the volume in cm³ of oxygen evolved as s.t.p. when a current of 5 A is passed through acidified water for 193s
{F = 96500 Cmol^-1, Molar volume of a gas at s.t.p. = 22.4 dm³}

A 224.000 dm³
B 0.056 dm³
C 0.224 dm³
D 56.000 dm³

Question 22:

In an endothermic reaction, if there is a loss in entropy the reaction will

A Be indeterminate
B Be spontaneous
C Not be spontaneous
D Be at equilibrium

Question 23:

the minimum amount of energy required for a reaction to take place is

A Lattice energy
B Ionization energy
C Activation energy
D Kinetic energy

Question 24:

Which of the following compounds is a neutral oxide?

A Carbon (IV) oxide
B Sulphur (Vl) oixide
C Sulphur (IV) oxide
D Carbon (ll) oxide

Question 25:

In the laboratory preparation of ammonia, the flask is placed in a slanting position so as to

A Prevent condensed water from breaking the reaction flask
B Enable the proper mixing of the reactions in the flask
C Enhance the speed of the reaction
D Prevent formation of precipitate