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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 1:

The addition of water to calcium oxide leads to?

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A A physical change
B A chemical change
C The formation of a mixture
D An endothermic change

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Question 2:

The addition of water to calcium oxide leads to?

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A A physical change
B A chemical change
C The formation of a mixture
D An endothermic change

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Question 3:

A mixture of iron and sulphur can be separated by dissolving the mixture in?

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A Steam
B Dilute hydrochloric acid
C Dilute sodium hydroxide
D Benzene

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Question 4:

A given amount of gas occupies 10.0 dm³ at atm, and 273°C. The number of moles of the gas present is?
(Molar volume of a gas at s.t.p. = 22.4 dm³)

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A 0.89 mol
B 1.90 mol
C 3.80 mol
D 5.70 mol

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Question 5:

8.0 g of an element X react with an excess of copper (ll) tetraoxosulphate (lV) solution to deposit 21.3 g of copper. The correct equation for the reaction is?
(Cu = 64).

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A X_(s) + CuSO_4(aq) â†’ Cu_(s) + XSO_4(aq)
B X_(s) + 2CuSO_4(aq) → 2Cu_(s) + X(SO₄)_2(aq)
C 2X_(s) + CuSO_4(aq) â†’ Cu_(s) + X₂SO_4(aq)
D 2X_(s) + 3CuSO_4(aq) â†’ 3Cu_(s) + X₂(SO₄)_3(aq)

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