AIEEE 2007 PYQ Mock Test

The energies of activation for forward and reverse reactions for $A_2+B_2\rightleftharpoons 2AB$ are $180{\text{kJ mol}}^{-1}$ and $200{\text{kJ mol}}^{-1}$ respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by $100{\text{kJ mol}}^{-1}$. The enthalpy change of the reaction ($A_2+B_2\to 2AB$) in the presence of catalyst will be (in ${\text{kJ mol}}^{-1}$):

The cell, $\text{Zn}|{\text{Zn}}^{2+}(1\text{M})||{\text{Cu}}^{2+}(1\text{M})|\text{Cu}$, $E_{\text{cell}}^0=1.10\text{V}$, was allowed to be completely discharged at $298\text{K}$. The relative concentration of ${\text{Zn}}^{2+}$ to ${\text{Cu}}^{2+}$, $\frac{[{\text{Zn}}^{2+}]}{[{\text{Cu}}^{2+}]}$, is:

The $p{K}_a$ of a weak acid ($HA$) is $4.5$. The $pOH$ of an aqueous buffered solution of $HA$ in which $50\%$ of the acid is ionized is:

Consider the reaction, $2A+B\to \text{Products}$. When concentration of $B$ alone was doubled, the half-life did not change. When the concentration of $A$ alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is:

Identify the incorrect statement among the following: