AIPMT 2006 Mock Test

$1.00\text{g}$ of non-electrolyte solute (molar mass $250{\text{g mol}}^{-1}$) was dissolved in $51.2\text{g}$ of benzene. If the freezing point depression constant, $K_f$ of benzene is $5.12{\text{K kg mol}}^{-1}$, the freezing point of benzene will be lowered by :

Which of the following pairs constitutes a buffer?

The hydrogen ion concentration of a $10^{-8}\text{M}$ $\text{HCl}$ aqueous solution at $298\text{K}$ ($K_w=10^{-14}$) is :

A solution of acetone in ethanol :

A hypothetical electrochemical cell is shown below $\text{A}|{\text{A}}^{+}(x\text{M})||{\text{B}}^{+}(y\text{M})|\text{B}$.The emf measured is $+0.20\text{V}$. The cell reaction is :