Chemical Reactions Mock Tests

5 questions available

Chemical Reactions Mock Test 1

Questions: 5

DSC Science

Why does a farmer treat acidic soil with slaked lime (calcium hydroxide) before planting crops?

A To kill weeds growing in the soil

B To neutralise the acidic soil and bring its pH to a near-neutral level suitable for plant growth

C To add nitrogen to the soil

D To make the soil more porous

DSC Science

What is the correct balanced equation for the reaction between iron and steam to form magnetic oxide of iron and hydrogen gas?

A Fe + H₂O → FeO + H₂

B 3Fe + 4H₂O → Fe₃O₄ + 4H₂

C 2Fe + 3H₂O → Fe₂O₃ + 3H₂

D Fe + 2H₂O → Fe(OH)₂ + H₂

DSC Science

The reaction: 2FeSO₄(s) → Fe₂O₃(s) + SO₂(g) + SO₃(g) (on heating) is an example of which type of chemical reaction?

A Displacement reaction

B Double displacement reaction

C Decomposition reaction

D Combination reaction

DSC Science

In the reaction: CuO + H₂ → Cu + H₂O, which substance is oxidised?

A Copper (Cu)

B Copper oxide (CuO)

C Hydrogen (H₂)

D Water (H₂O)

DSC Science

Which of the following indicators is obtained from lichens?

A Turmeric

B Red litmus

C Phenolphthalein

D Methyl orange

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