AIEEE 2004 (Chemistry) Mock Test

In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to:

In a first order reaction, the concentration of the reactant decreases from $0.8\text{M}$ to $0.4\text{M}$ in $15$ minutes. The time taken for the concentration to change from $0.1\text{M}$ to $0.025\text{M}$ is:

What is the equilibrium expression for the reaction ${\text{P}}_4(s)+5{\text{O}}_2(g)\rightleftharpoons {\text{P}}_4{\text{O}}_{10}(s)$?

For the reaction, $\text{CO}(g)+{\text{Cl}}_2(g)\rightleftharpoons {\text{COCl}}_2(g)$ the $\frac{K_p}{K_c}$ is equal to:

The equilibrium constant for the reaction ${\text{N}}_2(g)+{\text{O}}_2(g)\rightleftharpoons 2\text{NO}(g)$ at temperature $T$ is $4\times 10^{-4}$. The value of $K_c$ for the reaction $\text{NO}(g)\rightleftharpoons \frac{1}{2}{\text{N}}_2(g)+\frac{1}{2}{\text{O}}_2(g)$ at the same temperature is: