Question Bank Directory

The correct order of ionic character among CaH$$_2$$, BeH$$_2$$ and BaH$$_2$$ is:

For the reaction $2A \rightarrow B + C$, it would be a zero-order reaction when:

The rate of the reaction $2N_2O_5 \rightarrow 4NO_2 + O_2$ can be written in three ways: $-\frac{d[N_2O_5]}{dt} = k[N_2O_5]$ $\frac{d[NO_2]}{dt} = k'[N_2O_5]$ $\frac{d[O_2]}{dt} = k''[N_2O_5]$ The relationship between $k$ and $k'$ and between $k$ and $k''$ are:

The correct order of bond angles in the following compounds/species is:

Paramagnetic species among the following is:

The correct order of increasing thermal stability of $\text{K}_2\text{CO}_3$, $\text{MgCO}_3$, $\text{CaCO}_3$ and $\text{BeCO}_3$ is:

In the reaction, $3A \rightarrow 2B$ the rate of reaction $+\frac{d[B]}{dt}$ is equal to:

Beans get cooked earlier in a pressure cooker, because:

The activation energy for a simple chemical reaction $A \rightarrow B$ is $E_a$ in a forward direction. The activation energy for the reverse reaction:

The correct shape and hybridisation of BrF$_5$ is:

The correct order of electronegativity of hybrid orbitals of carbon is:

If the rate of reaction doubles when the temperature is raised from $20^\circ\text{C}$ to $35^\circ\text{C}$, then the activation energy for the reaction will be : ($R = 8.314 \text{ J mol}^{-1} \text{ K}^{-1}$)

If a first-order reaction reaches 60% completion within 60 minutes, approximately how much time would it take for the same reaction to reach 50% completion? ($\log 4=0.60$, $\log 5=0.69$)

For the reaction, $5Br^- + BrO_3^- + 6H^+ \rightarrow 3Br_2 + 3H_2O$, the correct representation of the consumption and formation of reactants and products is:

Which one of the following statements is correct?

A reaction having equal energies of activation for forward and reverse reactions has

Half-life period of a first order reaction is $1386 \text{ s}$. The specific rate constant of the reaction is:

The rate constants $k_1$ and $k_2$ for two different reactions are $10^{16} e^{-2000/T}$ and $10^{15} e^{-1000/T}$, respectively. The temperature at which $k_1 = k_2$ is:

The hybridisations of atomic orbitals of nitrogen in NO$^+$, NO$_3^-$ and NH$_3$ respectively are:

Mark the correct order of repulsion among the following according to the VSEPR theory.