Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) X gas has rotten fish smell, when react with `CuSO_4` solution, then what is the colour of ppt. - Sarthaks eConnect
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X gas has rotten fish smell, when react with `CuSO_4` solution, then what is the colour of ppt.

A.

Yellow

B.

Brown

C.

Red

D.

Black