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Chemical tests of four metals A, B, C, and D show the following results
$\to$ Only B and C react with 0.5 M $H C l$ to give $H_{2}$ gas.
$\to$ When B is added to a solution containing the ions of the other metals metallic A, C and D are formed.
$\to$ A reacts with 6 M $H N O_{3}$ , but D does not
Arrange the metals in increasing order as reducing agents.

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B, C, A, D

C, A, D, B

A, D, B, C

D, A, C, B

answer is A.

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Detailed Solution

Only B and C react with HCl means they are highly reactive, A reacts with

H N O_{3}

, but D does not react with

H N O_{3}

. Hence A is more reactive than D.

So $B > C > A > D$ .

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