Question

0.05M CuSO$_4$ when treated with 0.01M K$_2$Cr$_2$O$_7$ gives green colour solution of Cu$_2$Cr$_2$O$_7$. The \[ \text{[SPM : Semi Permeable Membrane]} \]

\(K_2Cr_2O_7\)		\(CuSO_4\)
Side X	SPM	Side Y

Due to osmosis:

• A. Green colour formation observed on side Y.
• B. Green colour formation observed on side X.
• C. Molarity of\(K_2Cr_2O_7\)solution is lowered.
• D. Molarity of\(CuSO_4\)solution is lowered.

Answer 1

The Correct Option is D

Due to osmosis, the solvent molecules from side Y (CuSO₄) diffuse across the semi-permeable membrane (SPM) into side X (K₂Cr₂O₇). This dilution effect causes the molarity of the CuSO₄ solution (side Y) to decrease over time.

• CuSO₄ reacts with K₂Cr₂O₇, forming Cu₂Cr₂O₇, which is responsible for the green color.
• The green color is observed due to the formation of Cu₂Cr₂O₇, but the key change is in the molarity of the CuSO₄ solution on side Y, which decreases as the solvent diffuses.

Thus the correct answer is Option 4.