Question Bank Directory

Which among the following species has a triangular planar shape?

$\text{XeF}_2$ is isostructural with:

The rate constant for a first order reaction is 4.606 × 10⁻³ s⁻¹. The time required to reduce 2.0 g of the reactant to 0.2 g is:

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

The angular shape of ozone molecule ($O_3$) consists of:

What is the dominant intermolecular force that must be overcome in converting liquid $CH_3OH$ to a gas?

In which of the following molecules are all the bonds not equal?

The electronegativity difference between $\text{N}$ and $\text{F}$ is greater than that between $\text{N}$ and $\text{H}$, yet the dipole moment of $\text{NH}_3$ (1.5 D) is larger than that of $\text{NF}_3$ (0.2 D). This is because:

Which of the following pairs of species have the same bond order?

Consider the following species: CN$$^+$$, CN$$^-$$, NO and CN. The highest bond order associated with:

The correct order of energies of molecular orbitals of N$$_2$$ molecule is:

Which one of the following molecules is paramagnetic?

A 300-gram radioactive sample has a half-life of 3 hours. After 18 hours the remaining quantity will be:

Arrange the following hydrides in the order of decreasing bond angle: (A) SbH$$_3$$ (B) AsH$$_3$$ (C) PH$$_3$$ (D) NH$$_3$$

Activation energy $E_a$ and rate constant ($k_1$ and $k_2$) of a chemical reaction at two different temperatures ($T_1$ and $T_2$) are related by:

An increase in the concentration of the reactants of a reaction leads to a change in:

A first order reaction has a specific reaction rate of $10^{-2} \text{ s}^{-1}$. How much time will it take for $20 \text{ g}$ of the reactant to reduce to $5 \text{ g}$?

The negatively geotropic roots produced by Rhizophora are called:

If the bombardment of $\alpha$-particle on $^{14}_{7}N$ emits protons, then the new atom will be:

If the half-life of a substance is $77 \text{ days}$ then its decay constant ($\text{days}^{-1}$) will be: