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

CBSE Class 10 CBSE Class 10 Science
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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.

Answer:

X is an alkali metal, Na or K.
Y is an alkaline earth metal, Mg or Ca.
Z is Fe.
Increasing reactivity series: Na > Mg > Fe.