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# 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.**

X reacts with cold water, hence, the element should be

**Sodium.**$Na + H_2O → 2NaOH + H_2$

Y reacts with hot water; hence, the element should be

**Magnesium.**$Mg + H_2O → Mg(OH)_2 + H_2$

Z reacts with steam only, hence, the element should be

**Iron.**$Fe + H_2O → Fe_2O_3+ H_2$

Arranging in ascending order (increasing order of reactivity)

**Fe < Mg < Ca**

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