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Standard X

Chemistry

Displacement Reaction

When a substa...

Question

When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner.

The substance A, B, C and D, respectively are:

N a, H_{2}, N a O H, Z n

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K, H_{2}, K O H, A l

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{C a H}_{2}, {C a (O H)}_{2}, S n

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{C a C}_{2}, C_{2} H_{2}, {C a (O H)}_{2}, F e

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Solution

The correct option is B $N a, H_{2}, N a O H, Z n$
Substance A is sodium metal. It reacts with water to produce hydrogen (gas B) and sodium hydroxide (compound C).

$2 N a + 2 H_{2} O \to 2 N a O H + H_{2} ↑$ .

Another substance D is zinc.
It reacts with solution of sodium hydroxide, it produces hydrogen gas on warming.
$Z n + 2 N a O H \to N a_{2} Z n O_{2}$
Zinc also reacts with sulphuric acid at room temperature to produce hydrogen gas.
$Z n + H_{2} S O_{4} r o o m t e m p e r a t u r e - ---------- \to Z n S O_{4} + H_{2} ↑$

Thus, substance A, B, C and D, respectively are Na, H $_{2}$ , NaOH, Zn.

Hence, the correct option is $A$

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