Question 63
Of the three metals X, Y and Z, X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.

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Solution

X is an alkali metal, either Na or K, as alkali metals react with cold water.

Alkaline earth metals do not react with cold water, but only with hot water. So, Y is alkaline earth metal, either Mg or Ca.

And Fe and Zn do not react with cold water as well as hot water, but only with steam. Z can be Fe and Zn.

Therefore, the order for increasing reactivity is Na > Mg> Fe.

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