A salt is heated first with dil. and then with conc.
. No reaction takes place. It may be
Nitrate
Sulphide
Oxalate
Sulphate
Since, there is no reaction with both dilute as well as concentrated .
The salt must contain group which is also present in the acid so reaction does not takes place.
All other mentioned anions will react with either dilute or concentrated .
Hence, the correct answer is Option (4)
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