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Please explain : Chemical tests of four metals A, B, C, and D show the following...

Please explain : Chemical tests of four metals A, B, C, and D show the following results. (a) Only B and C react with 0.5 M HCl to give H2 gas. (b) When B is added to a solution containing the ions of the other metals, metallic A, C, and D are formed. (c) A reacts with 6 M HNO3 but D does not. Select which represents the metals arranged in decreasing order as reducing agents

C > D > A > B
  

B > C > A > D
  

B > C > D > A
  

C > D > B > A
  

D > A > B > C
  

D > A > C > B
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Answer #1

a) Only B and C react with 0.5 M HCl to give H2 gas

This implies that B and C are stronger reducing agents than A and D

b) When B is added to a solution containing the ions of the other metals, metallic A, C, and D are formed

Tha above statement implies that B reduces ionic A,C and D to metallic. Hence B is thestrongest reducing agent amongst all

c) A reacts with 6 M HNO3 but D does not

A is stronger reducing agent that D.

Therefore the Order would be,

B > C > A > D

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