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 the min order of increasing reactivity.
Answer:
X is sodium or potassium (Na or K)
as it reacts with cold water.
Y is magnesium (Mg) as it reacts with
hot water.
Z is iron (Fe).
Increasing order of reactivity
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