List of top Chemistry Questions asked in BITSAT

A buffer solution is prepared by mixing 0.1 mol of acetic acid ($ \mathrm{p}K_a = 4.74 $) and 0.2 mol of sodium acetate in 1 L solution. What is the pH of the buffer?

Which of the following coordination compounds shows linkage isomerism?

Which of the following compounds undergoes electrophilic substitution most readily?

A first-order reaction is 25% complete in 30 minutes. How much time will it take for the reaction to be 75% complete?

The pH of a 0.01 M solution of a weak acid HA is 4. Calculate its dissociation constant (Ka).

The standard electrode potential for $\text{Zn}^{2+}/\text{Zn}$ is $-0.76$ V and for $\text{Cu}^{2+}/\text{Cu}$ is $+0.34$ V. The EMF of the cell
$$ \text{Zn}|\text{Zn}^{2+}||\text{Cu}^{2+}|\text{Cu} $$ is:

The acidic character of the oxides increases in the order:

A first-order reaction is 25% complete in 30 minutes. What is its half-life?

The standard reduction potentials are: \[ \mathrm{Cu^{2+} + 2e^- \rightarrow Cu} \quad E^\circ = +0.34\,V \] \[ \mathrm{Zn^{2+} + 2e^- \rightarrow Zn} \quad E^\circ = -0.76\,V \] Calculate the standard cell potential for the reaction: \[ \mathrm{Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu} \]

For the reaction $ \mathrm{N_2} + 3\mathrm{H_2} \rightleftharpoons 2\mathrm{NH_3} $, the equilibrium constant $K_c$ is 0.5 at a certain temperature. If initially, 1 mole of $\mathrm{N_2}$ and 3 moles of $\mathrm{H_2}$ are placed in a 1 L container, what is the equilibrium concentration of $\mathrm{NH_3}$?

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 1 L closed flask contains a mixture of 4 g of methane and 4.4 g of carbon dioxide. The pressure inside the flask at 27\degree C is (Assume ideal behaviour of gases):

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$^{4+}$

The charge on colloidal particles is due to:

The major product X in the following given reaction is:

Electron affinity is positive when:

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 = 8.314 J$K^{-1}$ $mol^{-1}$)

In an $ S_{\text{N}2} $ substitution reaction of the type: \[ R - Br + Cl^- \longrightarrow R - Cl + Br^- \]
Which one of the following has the highest relative rate?

In which mode of expression, the concentration of a solution remains independent of temperature?

The degeneracy of hydrogen atom that has energy equal to $-\frac{R_H}{9}$ is (where $ R_H $ = Rydberg constant)

If the de-Broglie wavelength of a particle of mass ($ m $) is 100 times its velocity, then its value in terms of its mass ($ m $) and Planck constant ($ h $) is:

The energy of the second orbit of a hydrogen atom is $ -5.45 \times 10^{-19} $ J. What is the energy of the first orbit of $ Li^{2+} $ ion (in J)?

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:

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

Intramolecular hydrogen bonding is found in