JAMB Chemistry Past Questions & Answers - Page 236

1,176.

60cm3 of hydrogen are sparked with 20cm3 of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is?

A.

60 cm3

B.

10 cm3

C.

40 cm3

D.

30 cm3

E.

70 cm3

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,177.

The number of grammes of potassium hydroxide in 250cm3 of one molar solution is?
(K = 39, O = 16, H = 1)

A.

40g

B.

52g

C.

100g

D.

26g

E.

14g

View answer & explanation

Correct answer is E

1000 cm3 of KOH contains 56 gm of KOH
250 cm3
of 1M KOH will contain (250)/(1000) x (56)/(1) = 14gms

1,178.

Brass is an alloy containing copper and?

A.

zinc

B.

tin

C.

aluminium

D.

silver

E.

lead

View answer & explanation

Correct answer is A

Brass is an alloy containing copper and zinc

1,179.

Which of the following processes NOT lead to a chemical change?

A.

Strirring iron in sulphur (IV) acid

B.

Stirring sodium carbonate in water

C.

Stirring glucose in concentrated sulphur (IV) acid

D.

Mixing sulphur (IV) acid with potassium carbonate

E.

Titrating an acid against base

View answer & explanation

Correct answer is B

Stirring Na2CO3 in water does not lead to a chemical change

1,180.

0.16g of methane when burnt raises the temperature of 100g of water by 40°C. What is the of combustion of methane when if the heat capacity of water is 4.2 Jg-1°C-1?

(CH4 = 16)

A.

1,160 kJ mol-1

B.

1,180 kJ mol-1

C.

1,560 kJ mol-1

D.

1,600kJ mol-1

E.

1,680 kJ mol-1

View answer & explanation

Correct answer is E

The heat of combustion of methane is 1680 KJ mol-1


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