JAMB Chemistry Past Questions & Answers - Page 166

826.

The scale of a chemical balance is made of iron plate and coated with copper electrolytically because

A.

iron is less susceptible to corrosion than copper

B.

copper is twice as less susceptitible to corrosion as iron

C.

copper is less susceptible to corrosion than iron

D.

copper and iron are equally susceptible to corrosion

Correct answer is C

No explanation has been provided for this answer.

827.

The products of the thermal decomposition of ammonium trioxonitrate (V) are

A.

NO 2 and oxygen

B.

NH3 and oxygen

C.

nitrogen and water

D.

N2O and water

Correct answer is D

No explanation has been provided for this answer.

828.

Bleaching powder, CaOCI2, H2O, deteriorates on exposure to air because

A.

it loses its water of crystallization

B.

atmospheric nitrogen displaces chlorine from it

C.

carbon (IV) oxide of the atmosphere displaceschlorine from it

D.

bleaching agents should be stored in solution

Correct answer is C

No explanation has been provided for this answer.

830.

Gunpower is made from charcoal, sulphur and potassium trioxonitrate (V) The salt in the mixture performs the function of

A.

an oxidant

B.

a reductant

C.

a solvent

D.

a catalyst

Correct answer is A

No explanation has been provided for this answer.