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Q.

If reacts with conc., then what reactions take place ?

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a

is oxidised to

b

S O_{4}^{2 -}

is reduced to

{SO}_{2}

c

Both of the above reactions take place

d

None of the above reactions take place

answer is C.

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Detailed Solution

Concept- Copper cannot displace hydrogen from sulphuric acid as Copper is less reactive than hydrogen as per the reactive series. Here, the oxidation nature of sulphuric acid is considered.
Now, conc. Sulphuric acid is a strong oxidising agent.Thus, when

is added to sulphuric acid, the cu gets oxidised and sulphuric acid gets reduced to form sulphur dioxide.
The reaction between

and conc.

is given as follows;

In this reaction, Cu is oxidised to +2 state in

CuS O_{4}

and sulphate ion (

S O_{4}^{2 -}

) of sulphuric acid is reduced to sulphur dioxide (

{SO}_{2}

) . Thus, both reactions given in option 1 and 2 take place.
Hence, the correct answer is option 3.

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