List of top Questions asked in KEAM- 2017

Hybridisation of carbon in CH$_3^-$

Consider a fuel cell supplied with 1 mole of H$_2$ gas and 10 moles of O$_2$ gas. If the fuel cell is operated at 96.5 mA current, how long will it deliver power? (Assume $1\ F = 96500\ \text{C/mol of electrons}$)

The common features among CO, CN$^-$ and NO$_2^+$ are

10 g of MgCO$_3$ decomposes on heating to 0.1 mole CO$_2$ and 4 g MgO. The percent purity of MgCO$_3$ is

Solubility product $(K_{sp})$ of saturated PbCl$_2$ in water is $1.8 \times 10^{-4}\ \text{mol}^3\text{dm}^{-9}$. What is the concentration of Pb$^{2+}$ in the solution?}

For the process $\frac{3}{2}A \rightarrow B$, at 298 K, $\Delta G^\circ$ is $163\ \text{kJ mol}^{-1}$. The composition of the reaction mixture is $[B]=1$ and $[A]=10000$. Predict the direction of the reaction and the relation between reaction quotient $(Q)$ and the equilibrium constant $(K)$.}

The freezing point of equimolal aqueous solutions will be highest for

The molality of the 3M solution of methanol if the density of the solution is $0.9\ \text{g cm}^{-3}$ is}

In the $\ln K$ vs $\frac{1}{T}$ plot of a chemical process having $\Delta S^\circ > 0$ and $\Delta H^\circ < 0$, the slope is proportional to (where $K$ is equilibrium constant)}

Which of the following is not true about a catalyst?

For the process $A(l,\,0.05\,\text{atm},\,32^\circ C) \rightarrow A(g,\,0.05\,\text{atm},\,32^\circ C)$, the correct set of thermodynamic parameters is

Pressure of ideal and real gases at $0$ K are

Among the following, the molecule that will have the highest dipole moment is

Which of the following pair have identical bond order?

A gas will approach ideal behaviour at

Mixing of $N_2$ and $H_2$ form an ideal gas mixture at room temperature in a container. For this process, which of the following statement is true?

Uncertainty principle is valid for

The energy of an electron in the $3S$ orbital (excited state) of H-atom is

Eight grams of Cu$^{66}$ undergoes radioactive decay and after 15 minutes only 1 g remains. The half-life, in minutes, is then}

For a light nuclei, which of the following relation between the atomic number (Z) and mass number (A) is valid

A torque of $1$ N m is applied to a wheel which is at rest. After $2$ seconds the angular momentum in kg m$^2$/s is

A wheel rotating at $12$ rev/s is brought to rest in $6$ s. The average angular deceleration in rad/s$^2$ of the wheel during this process is

If a magnet is dropped through a vertical hollow copper tube then

An electric motor when loaded has an effective resistance of $30\,\Omega$ and an inductive reactance of $40\,\Omega$. If the motor is powered by a source with maximum voltage of $420\,V$, the maximum current is

CO$^{-}$ ion moving with kinetic energy of 20 keV dissociates into O$^{-}$ and C which move along the parent ion direction. Assuming no energy is released during dissociation, the kinetic energies of the daughters $(K.E.)_{O^-}$ and $(K.E.)_C$ are related as}