NECO Chemistry Past Questions & Answers - Page 13

61.

An element Z has a combining power of 3. Which of the following formulae is correct of its compound?

A.

ZS₃

B.

ZSO₃

C.

ZS0₄

D.

Z0₃

E.

Z₃Cl₂

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

62.

Bauxite is the ore of

A.

aluminium

B.

calcium

C.

Iron

D.

sodium

E.

magnesium

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

63.

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.

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

64.

pH is define as

A.

[H+]

B.

–log [H]

C.

–log [H+]

D.

log [H]

E.

log [H+]

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

65.

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

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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