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Sowmya took five metals, i.e. sodium, magnesium, zinc, iron, and copper in five different test tubes labeled them as 1, 2, 3, 4 and 5 and added equal amount of water in each test tube.

In which test tube hydrogen gas is evolved only when it is boiled. The metal taken by her in this test tube was

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Sodium

Copper

Magnesium

Zinc

answer is B.

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Detailed Solution

Among the metals, sodium vigerouly reacts with cold and hot water. But ‘Mg’ is reactive with hot water and ‘Cu’ is not displaces

H_{2}

gas. So, Mg liberate

H_{2}

with hot water.

Test tube-1: $2 N a + 2 H_{2} O \overset{Cold or Heat}{\to} 2 N a O H + H_{2}$

Test tube-2: $M g + 2 H_{2} O \overset{Δ}{\to} M g {(O H)}_{2} + H_{2}$

Test tube-3: $Z n + H_{2} O \overset{Δ}{\to} Z n {(O H)}_{2} + H_{2}$

Test tube-4: $F e + H_{2} O \overset{Δ}{\to} F e (O H) + H_{2}$

Test tube-5: $C u + H_{2} O \overset{Δ}{\to} N o r e a c t i o n$ .

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