AIPMT 2011 Preliminary Mock Test

The total number of atomic orbitals in fourth energy level of an atom is:

The electrode potentials for ${\text{Cu}}_{(\text{aq})}^{2+}+e^{-}\to {\text{Cu}}_{(\text{aq})}^{+}$ and ${\text{Cu}}_{(\text{aq})}^{+}+e^{-}\to {\text{Cu}}_{(\text{s})}$ are $+0.15\text{V}$ and $+0.50\text{V}$ respectively. The value of $E_{{\text{Cu}}^{2+}/\text{Cu}}^{\circ }$ will be:

Mole fraction of the solute in a $1.00$ molal aqueous solution is:

By what factors does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

A buffer solution is prepared in which the concentration of ${\text{NH}}_3$ is $0.30\text{M}$ and the concentration of ${\text{NH}}_4^{+}$ is $0.20\text{M}$. If the equilibrium constant, $K_b$ for ${\text{NH}}_3$ equals $1.8\times 10^{-5}$, what is the pH of this solution?