List of practice Questions

The rate constant is doubled when temperature increases from 27°C to 37°C. Activation energy in kJ is:

In the reaction, \( C_6H_5OH + NaOH \rightarrow \) (B) \( \rightarrow (C) \), the compound (C) is:

Calculate the energy needed to convert three moles of sodium atoms in the gaseous state to sodium ions. The ionization energy of sodium is 495 kJ/mol:

The uncertainty in position and velocity of a particle are \( 10^{-10} \, \text{m} \) and \( 5.27 \times 10^{-24} \, \text{ms}^{-1} \) respectively. Calculate the mass of the particle is (h = \( 6.625 \times 10^{-34} \, \text{Js} \)):

Choose the complex which is paramagnetic:

Phosphine is generally prepared in the laboratory:

The reaction \( 2NO(g) + O_2(g) \rightarrow 2NO_2(g) \) is of first order. If volume of the reaction vessel is reduced to \( \frac{1}{3} \) times, the rate of reaction would be:

Which are the starting materials for the preparation of the compound shown in the figure?

Which element gives the maximum number of oxides?

An organic compound 'A' has the molecular formula \( C_3H_6O \), it undergoes iodoform test. When saturated with dil. HCl it gives 'B' of molecular formula \( C_9H_{14}O \). A and B respectively are:

Here Z is

Calculate the entropy change in melting 1 mole of ice at 273 K, \( \Delta H_f^o = 6.025 \, \text{kJ/mol} \):

In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is true?

At low pressure, the van der Waals equation is reduced to:

Copper sulfate solution reacts with KCN to give:

For the reaction \[ \text{H}_2 \text{(g)} + \frac{1}{2} \text{O}_2 \text{(g)} \rightarrow \text{H}_2 \text{O}(\ell), \Delta H = -285.8 \, \text{kJ/mol}^{-1} \] \text{The value of free energy change at 27°C for the reaction is:}

A reaction involving \( K_2 \text{Cr}_2 \text{O}_7 \) is treated with hydrogen sulfide. The oxidation number of chromium changes from +3 to +6, +2, or remains unchanged. Which of the following correctly reflects the change in oxidation number?

Bragg's law is given by which of the following equation?

The value of \( K_c \) for the reaction: \[ A + 3B \rightleftharpoons 2C \text{ at } 400^\circ C \text{ is } 0.5. \text{ Calculate the value of } K_p. \]

Tautomerism is net exhibited by:

The electrode potentials for \[ \text{Cu}^{2+}(aq) + e^- \rightleftharpoons \text{Cu}(s) \] \text{and} \[ \text{Cu}^{2+}(aq) + e^- \rightleftharpoons \text{Cu}(aq) \] \text{are +0.15 V and +0.50 V, respectively. The value of \( E^\circ_{\text{Cu}^{2+}/\text{Cu}} \) will be:}

Deep sea divers use to respire a mixture of:

The wavelengths of two photons are 2000Å and 4000Å, respectively. What is the ratio of their energies?

Ethylene glycol, on oxidation with periodic acid, gives:

What is X in the following change?