Calculate the molar mass of a nonvolatile solute if 6.4 g of it dissolved in 100 g water produces a relative lowering in vapour pressure of $0 \cdot 016$ at 300 K.

Calculate the cryoscopic constant of a solvent if depression in freezing point of $0 \cdot 3$ m solution of nonelectrolyte is $0 \cdot 48$ K

Identify the correct statement from following.

What is the change in oxidation number of Pb at positive electrode of lead accumulator acting as galvanic cell ?