JAMB Chemistry Past Questions & Answers - Page 172

856.

Pick out the correct statement

A.

Zin heated to redness reacts with steam to give oxygen and zinc oxide

B.

Zinc heated to redness reacts with steam to give oxygen and hydrogen

C.

Zinc does not react with hot or cold water

D.

Zinc reacts with hot water to form zinc oxide and hydrogen

E.

Zinc reacts very easily with cold water to give zinc oxide and hydrogen

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

857.

A piece of metal (M) is dissolved in nitric acid and the resulting solution is treated with a small quantity of sodium hydroxide to produce a white precipitate (B) which redissolves on the addition of excess alkali. The precipitate (B)when ignited in a crucible produces the oxide of the metal(m). The METAL M is

A.

Zn

B.

Cu

C.

Al

D.

Au

E.

Ca

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

858.

Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?

A.

CaCO 3

B.

Zn(NO3)2

C.

CuSO4

D.

AICI3

E.

CaSO4

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

859.

When excess ethanol is heated to 145 oC in the presence of concentrated sulphuric acid, the product is

A.

diethyl ether

B.

ethyne

C.

diethyl sulphate

D.

acetone

E.

ethanoic acid

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

860.

A gas occupies 30.0 dm3 at S.T.P. What volume would it occupy at 91oC and 380 mm Hg?

A.

20. 0dm3

B.

40.0dm3

C.

60. 0dm3

D.

80. 0dm3

E.

100. 0dm3

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.


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