JEE Main 2011 — Physical Chemistry

Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to $4 \mathrm{~kg}$ of water to prevent it from freezing at $-6^{\circ} \mathrm{C}$ will be : $\left[\mathrm{K}_{\mathrm{t}}\right.$ for water $=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$, and molar mass of ethylene glycol $=62 \mathrm{~g} \mathrm{~mol}^{-1}$ )

The degree of dissociation $(\alpha)$ of a weak electrolyte, $A_x B_y$ is related to van't Hoff factor (i) by the expression:

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of $10 \mathrm{dm}^3$ to a volume of $100 \mathrm{dm}^3$ at $27^{\circ} \mathrm{C}$ is :

The magnetic moment (spin only) of $\left[\mathrm{NiCl}_4\right]^{2-}$ is

The rate of a chemical reaction doubles for every $10^{\circ} \mathrm{C}$ rise of temperature. If the temperature is raised by $50^{\circ} \mathrm{C}$, the rate of the reaction increases by about :

The reduction potential of hydrogen half cell will be negative if :