Question

X, Y, Z are 3 metals. Y liberates hydrogen from cold water, while X and Z do not. Z displaces X from a solution of its salt in water. Arrange X, Y and Z in a decreasing order of their reactivity​

Answer 1

Answer:

X > Z > Y

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Answer 2

Order of reactivity is Z > X > Y

Explanation:

Alkali metals like Sodium (Na) has vigorous reaction with cold water and liberates Hydrogen. So X is alkali metal.

Z displaces X from a solution of its salt in water, so X is less reactive than Z.

Alkaline Earth metals are most reactive than other metals except alkali metals, therefore Y is an alkaline earth metal. (e.g: Mg or Ca)

Metals react with water and produce a metal oxide and hydrogen gas. Zinc, Magnesium, Aluminium do not react with cold water to produce hydrogen.

Sodium is most reactive. Followed by Magnesium, Aluminium. A metal that displaces X should be more reactive than X. So the order of reactivity is Z > X > Y.