Solids W, X, Y and Z are compounds of two different Group II metals. Some of their applications are described below.
Compound W is used as a refractory lining material in kilns.
Compound X is used as a building material. It can also be heated in a kiln to form compound Y.
When Y is hydrated, it forms compound Z which is used agriculturally to treat soils.
Which statements about these compounds are correct?
1 Adding W to water has less effect on pH than adding Y.
2 Adding Z to soil increases the pH of the soil.
3 The metallic element in Y reacts with cold water more quickly than the metallic element in W.

Q: What topic does this question test?

This question tests Group 2 in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry May/June 2013 examination, Paper 1 Variant 2 (9701_s13_qp_12.pdf).

Question

Solids W, X, Y and Z are compounds of two different Group II metals. Some of their applications are described below.
Compound W is used as a refractory lining material in kilns.
Compound X is used as a building material. It can also be heated in a kiln to form compound Y.
When Y is hydrated, it forms compound Z which is used agriculturally to treat soils.
Which statements about these compounds are correct?
1 Adding W to water has less effect on pH than adding Y.
2 Adding Z to soil increases the pH of the soil.
3 The metallic element in Y reacts with cold water more quickly than the metallic element in W.

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The correct answer is A: 1, 2 and 3 are correct.

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