List of top Questions asked in KEAM- 2025

Ammonium ion ($NH_4^+$) reacts with nitrite ion ($NO_2^-$). Based on the experimental data provided, which of the following is the rate law? ________.

A first order reaction is 75% completed in 6000 s. What is its half life period at the same temperature? ________.

The vapour pressure of pure benzene at a certain temperature is 0.85 bar. When 0.5 g of a non-volatile solute is added to 39 g of benzene, the vapour pressure becomes 0.845 bar. What is the molar mass of the substance? ________.

For which of the following electrode reactions the standard electrode potential is the highest at 298 K? The ions are present in aqueous solution. ________.

For $Zn(s)+Cu^{2+}(0.1M) \rightarrow Zn^{2+}(0.001 M)+Cu(s)$, calculate $E_{cell}$ if $E^0_{cell} = 1.1V$. ________.

In which of the following equilibrium $K_{P}=K_{C}$? ________.

If 'S' is the solubility of $X_{3}Y_{2}$ in pure water, the solubility product ($K_{sp}$) is ________.

Molar enthalpy change for vaporization of 1 mol of water at $100^{\circ}C$ is $41kJ~mol^{-1}$. Calculate the internal energy change ($kJ~mol^{-1}$) assuming ideal gas behavior. ________.

12g of pure graphite is burnt. Temperature rises from 298 K to 308 K. Heat capacity of the calorimeter is $20.7~kJ~K^{-1}$. Enthalpy change for combustion of 1 mole of graphite $(kJ~mol^{-1})$ is ________.

Which one of the following molecules contains two 'sigma' ($\sigma$) bonds and two 'pi' ($\pi$) bonds? ________.

The alkali metal with the highest first enthalpy of ionization is ________.

What is the total number of orbitals associated with the principal quantum number $n=3$? ________.

For any sub-shell defined by '$l$' value how many values of magnetic quantum number ($m_l$) are possible? ________.

Ten grams of calcium carbonate which is only 90% pure is treated with excess hydrochloric acid. What is the mass of $CO_{2}$ gas liberated? (Atomic mass: $Ca=40$, $C=12$ & $O=16$) ________.

The donor level in an n-type semiconductor lies ________.

In a Germanium crystal containing N atoms, the total number of outer electrons is ________.

If a radioactive element disintegrates for its mean life, the fraction of original amount remaining is ________.

In the nuclear reaction $\begin{smallmatrix}197\\ 80\end{smallmatrix}X \rightarrow \begin{smallmatrix}197\\ 79\end{smallmatrix}Y + Z + v$, the particle Z is ________.

The ratio of the respective de Broglie wavelengths of two particles with kinetic energy of 0.02 eV and 2 eV is ________.

The plot of maximum kinetic energy of photo-electrons vs the energy of incident photons above threshold frequency is ________.

In Huygens construction, the secondary wavelets move ________.

The phenomenon of diffraction is most significant when the slit width is ________.

When a beam of white light enters into an optical prism, the most deviated colour is ________.

The speed of electromagnetic waves in a medium depends on the ________.

A metal rod of length 0.5 m moves at $3~ms^{-1}$ perpendicular to a magnetic field of 0.2 T. The induced emf is ________.