Question Bank Directory

If the main axis of a diatomic molecule is z, then the molecular orbital $p_x$ and $p_y$ overlap to form which of the following orbital:

Which statement about peptide bonds is NOT true?

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

Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.

Dipole-induced dipole interactions are present in which of the following pairs?

Which of the following species contains equal number of $\sigma$ and $\pi$ bonds?

The pair of electrons in the given carbanion, $\text{CH}_3\text{C}\equiv\text{C}^-$, is present in which of the following orbitals?

$BF_3$ is a planar and an electron-deficient compound. Hybridisation and the number of electrons around the central atom, respectively, are:

The species, having bond angles of 120° is :

If $C + O_2 \rightarrow CO_2$, $C + \frac{1}{2}O_2 \rightarrow CO$, and $CO + \frac{1}{2}O_2 \rightarrow CO_2$, the heats of reaction are $Q$, $-12$, and $-10$ respectively. Then $Q$ =

The enthalpy of combustion of $\text{H}_2$, cyclohexene ($\text{C}_6\text{H}_{10}$) and cyclohexane ($\text{C}_6\text{H}_{12}$) are $-241$, $-3800$ and $-3920 \text{ kJ per mol}$ respectively. Heat of hydrogenation of cyclohexene is:

Match the following columns and select the correct option. Column-I (a) 6-15 pairs of gill slits (b) Heterocercal caudal fin (c) Air Bladder (d) Poison sting Column-II (i) Trygon (ii) Cyclostomes (iii) Chondrichthyes (iv) Osteichthyes

Hydrolysis of sucrose is given by the following reaction. Sucrose + $H_2O \rightleftharpoons$ Glucose + Fructose. If the equilibrium constant ($K_c$) is $2 \times 10^{13}$ at 300 K, the value of $\Delta_r G^{\ominus}$ at the same temperature will be :

Which among the following species has a triangular planar shape?

If for a given substance melting point is $T_B$ and freezing point is $T_A$, then correct variation shown by graph between entropy change and temperature is

Which one of the following molecules contain no $\pi$ -bond?

A mixture of $N_2$ and Ar gases in a cylinder contains 7 g of $N_2$ and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of $N_2$ is : [Use atomic masses (in g $mol^{-1}$) : N = 14, Ar = 40]

The correct order of increasing bond length of $\text{C-H}$, $\text{C-O}$, $\text{C-C}$ and $\text{C=C}$ is:

Consider the following reaction: 2H2(g) + O2(g) → 2H2O(g); ΔrH° = -483.64 kJ. What is the enthalpy change (in kJ) for the decomposition of one mole of water?

Given below are four methods (A-D) and their modes of action (1-4) in achieving contraception. Select their correct matching from the four options that follow:<br><br>Column I<br>A. The Pill<br>B. Condom<br>C. Vasectomy<br>D. Copper T<br><br>Column II<br>1. Prevents sperms reaching cervix<br>2. Suppress sperm motility<br>3. Prevents ovulation<br>4. Semen contains no sperms