Question

The reaction for tarnish formation due to contact with hydrogen sulphide.

2Ag(s) + H2

S(g) → Ag2

S(s) + H2(g) and the above tarnish can be removed by using Al metal as

2 23 23 6 Al + →+ Ag S S Ag Al

The above two reactions appears to be a displacement reactions. But ‘Ag’ is less reactive than ‘H’

in reactivity series. Then what might be the reason. [ ]

i) ‘Ag’ can displace ‘H’ under certain conditions even though it is less reactive

ii) Ag cannot react directly with H2

S to displace ‘H’ from it.

iii) ‘Ag’ first oxidised to its oxide and then it reacts with H2

S to form Ag2

S

iv) The formation of Ag2

S is possible by a decomposition reaction.

a) i, ii, iii only b) ii, iii only c) ii, iii, iv only d) All​

Answer 1

Answer:

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Answer 2

option (a)

i, ii, iii only