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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