Volume of hydrogen liberated at S.T.P = 203 cc
Wt. of 1 cc of hydrogen = 0.00009 g
Wt. of hydrogen liberated at S.T.P. = 203 × 0.00009 g = 0.01827 g
Wt. of copper deposited = 0.571 g
Eq. wt. of hydrogen = 1.008
We know, Wt. of copper/Wt.of hydrogen=Eq.wt.of copper/Eq.wt.of hydrogen
Therefore, the equivalent weight of copper is 31.49.
Hence (A) is the correct answer.