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A metal M which is not affected by stron...

A metal M which is not affected by strong acids like conc. `HNO_3` conc. `H_2 SO_4` and concentrated solutions of alkalies like KOH and NaOH but dissolves in aqua-regia and forms `MCI_3` which is used for toning in photography. The metal M is:

A

Ag

B

Hg

C

Au

D

Cu

Text Solution

Verified by Experts

The correct Answer is:
C
Au is not affected by concentrated acids and strong alkalies. However, it dissolves in aqua-regia forming `AuCl_3` which is used for toning in photography.
`2Au+3 HNO_3 + 9 HCl to 2 AuCl_3 + 3 NOCl + 6 H_2 O`
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Knowledge Check

  • Ordinary strong solution of HCI, HNO_3 and H_2 SO_4 contains roughly

    A
    1/5, 2/3 and 3/3 fractions of pure acid and water respectively
    B
    2/3, 1/5 and 3/3 fractions of pure acid and water respectively
    C
    2/3, 3/3 and 1/5 fractions of pure acid and water respectively
    D
    2/3,1/3 and 3/5.fractions of pure acid and water respectively

  • Ordinary strong solution of HCl, HNO_3 and H_2SO_4 contains roughly

    A
    1/5, 2/3 and 3/3 fractions of pure acid and water respectively
    B
    2/3, 1/5 and 3/3 fractions of pure acid and water respectively
    C
    2/3 , 3/3 and 1/5 fractions of pure acid and water respectively
    D
    2/3,1/3 and 3/5 fractions of pure acid and water respectively

  • In the nitration of benzene using a mixture of conc. H_2 SO_4 and conc. HNO_3 , the species which initiates the reaction is ............

    A
    `NO_2`
    B
    `NO^+`
    C
    `NO_2^+`
    D
    `NO_2^-`

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