List of top Chemistry Questions asked in KEAM

Which of the following is covalent?

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

Consider the equilibrium obtained by electrically connecting zinc-amalgam (Zn(Hg)) and HgO electrodes in mercury cell, $ \text{Zn(Hg)} + \text{HgO(s)} \rightleftharpoons \text{ZnO(s)} + \text{Hg(l)} $. Under this equilibrium, what is the relation between the potential of the Zn(Hg) and HgO electrodes measured against the standard hydrogen electrode?}

Hybridisation of carbon in CH$_3^-$

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

The compound Na$_2$CO$_3 \cdot x$H$_2$O has 50 % H$_2$O by mass. The value of $x$ 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?}

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}

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 $(K)$.}

Which of the following is not true about a catalyst?

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 pair have identical bond order?

A gas will approach ideal behaviour at

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

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

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?

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

Uncertainty principle is valid for

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

What wavelength must electromagnetic radiation have if a photon in the beam has the same momentum as an electron moving with a speed $1.1 \times 10^5$ m/s (Planck’s constant $= 6.6 \times 10^{-34}$ Js, rest mass of electron $= 9 \times 10^{-31}$ kg)?

The hybridized state of Al\(^{3+}\) in the complex ion formed when AlCl\(_3\) is treated with aqueous acid is

In which one of the following compounds of xenon, highest number of lone pairs of electrons is present on xenon?

The second ionization enthalpy of which of the following alkaline earth metals is the highest?