List of top Chemistry Questions asked in BITSAT

A photon of wavelength $ 3000 $ Å strikes a metal surface. The work function of the metal is $ 2.13 $ eV. What is the kinetic energy of the emitted photoelectron? ($ h = 6.626 \times 10^{-34} $ Js)

A stream of electrons from a heated filament was passed between two charged plates at a potential difference $ V $ volt. If $ e $ and $ m $ are the charge and mass of an electron, then the value of $ \frac{h}{\lambda} $ is:

Which one of the following compounds is having maximum 'lone pair-lone pair' electron repulsions?

Identify the species having one $\pi$-bond and maximum number of canonical forms from the following:

The ionic radii in (${Å}$) of ${N}^{3-}$, ${O}^{2-}$ and ${F}^-$ are respectively.

The spin only magnetic moment of Fe$^{3+}$ ion (in BM) is approximately.

The hybridisation scheme for the central atom includes a d-orbital contribution in

Intramolecular hydrogen bonding is found in

In the following species, how many species have the same magnetic moment?
(i) Cr$^{2+}$
(ii) Mn$^{3+}$
(iii) Ni$^{2+}$
(iv) Sc$^{2+}$
(v) Zn$^{2+}$
(vi) V$^{3+}$
(vii) Ti$^{4+}$

Calculate the activation energy of a reaction, whose rate constant doubles on raising the temperature from 300 K to 600 K.

In the chemical reaction A $\rightarrow$ B, what is the order of the reaction? Given that, the rate of reaction doubles if the concentration of A is increased four times.

If for a first-order reaction, the value of $ A $ and $ E_a $ are $ 4 \times 10^{13} $ s$^-1$ and 98.6 kJ mol$^{-1}$ respectively, then at what temperature will its half-life be 10 minutes?

Electron affinity is positive when:

For the reaction 2SO$_2$ + O$_2$ $\rightleftharpoons $ 2SO$_3$, the rate of disappearance of O$_2$ is $ 2 \times 10^{-4} $ mol L$^{-1$ s$^{-1}$.
The rate of appearance of SO$_3$ is:

When the same quantity of electricity is passed through the aqueous solutions of the given electrolytes for the same amount of time, which metal will be deposited in maximum amount on the cathode?

The pH of 1 N aqueous solutions of HCl, CH$_3$COOH and HCOOH follows the order:

The standard Gibbs energy ($ \Delta G^{\circ} $) for the following reaction is \[ A(s) + B^{2+}(aq) \rightleftharpoons A^{2+}(aq) + B(s), \quad K_c = 10^{12} \, {at} \] (Kc = equilibrium constant)

20 mL of 0.1 M acetic acid is mixed with 50 mL of potassium acetate. $ K_a $ of acetic acid $ = 1.8 \times 10^{-5} $ at 27°C. Calculate the concentration of potassium acetate if the pH of the mixture is 4.8.

Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following:

The combustion of benzene (L) gives CO$_2$ (g) and H$_2$O (L). Given that heat of combustion of benzene at constant volume is -3263.9 kJ/mol at 25°C, heat of combustion (in kJ/mol) of benzene at constant pressure will be: (R = 8.314J$K^-^1$ $mol^-^1$)