NECO Past Questions and Answers - Page 104

516.

NaCl(s) does NOT conduct electricity, but N(aq) does. This is because

A.

NaCl(s) is non-ionic but NaCl(aq) is ion

B.

NaCl(aq) contains mobile electrons, where absent in NaCl(s).

C.

NaCl(aq) contains mobile ions which Nacl,) does not contain.

D.

NaCl(s) ionizes partiality while NaCl(aq) iodizes completely.

E.

NaCl(s) decomposes when heated but NCl(aq) is stable to heat.

Correct answer is C

No explanation has been provided for this answer.

517.

The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by

A.

conversion

B.

elimination

C.

oxidation

D.

reduction

E.

substitution

Correct answer is C

No explanation has been provided for this answer.

519.

Faraday s first law of electrolysis can be expressed mathematically as

A.

m=I/it

B.

mαit

C.

Q=it

D.

QαI/it

E.

Qαit

Correct answer is B

No explanation has been provided for this answer.