NECO Past Questions and Answers - Page 90

446.

Bauxite is the ore of

A.

aluminium

B.

calcium

C.

Iron

D.

sodium

E.

magnesium

Correct answer is A

No explanation has been provided for this answer.

447.

Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of

A.

combining volumes

B.

conservation of mass

C.

definite proportion

D.

multiple proportion

E.

reciprocal proportion.

Correct answer is B

No explanation has been provided for this answer.

448.

pH is define as

A.

[H+]

B.

–log [H]

C.

–log [H+]

D.

log [H]

E.

log [H+]

Correct answer is C

No explanation has been provided for this answer.

449.

Which of the following compounds is unsaturated?

A.

Cyclohexane

B.

Methoxyethane

C.

1 ,2-dibromoethane

D.

2,2,3-trimethylpentane

E.

3-methylbut-l-ene

Correct answer is E

No explanation has been provided for this answer.

450.

A solution is prepared by dissolving I .96g of H2SO4 in 250 cm3 of its solution. What is the concentration in moles per dm3?

A.

0.008

B.

0.08

C.

0.1

D.

0.8

E.

8.02

Correct answer is B

No explanation has been provided for this answer.