List of top Chemistry Questions

The amount of bromine (atomic wt. = 80) required (in gram) for the estimation of 42.3 g of phenol (molecular wt. = 94 g mol$^{-1}$) is .............

The adsorption of a gas follows the Langmuir isotherm with $K = 1.25$ kPa$^{-1}$ at 25 $^\circ$C. The pressure (in Pa) at which the surface coverage is 0.2 is ______

The separation of 123 planes (in nm) in an orthorhombic cell with $a = 0.25$ nm, $b = 0.5$ nm, $c = 0.75$ nm is ______ (round to two decimals).

The standard reduction potentials of Ce$^{4+}$/Ce$^{3+}$ and Fe$^{3+}$/Fe$^{2+}$ are 1.44 and 0.77 V, respectively. The log$_{10}K$ (K is equilibrium constant) value for the following reaction is ............. (final answer should be rounded off to two decimal places)
\[ \text{Ce}^{4+} + \text{Fe}^{2+} \rightleftharpoons \text{Ce}^{3+} + \text{Fe}^{3+} \]

The maximum number of dipeptides that could be obtained by reaction of phenylalanine with leucine is .............

At an operating frequency of 350 MHz, the shift (in Hz) of resonance from TMS of a proton with chemical shift of 2 ppm is ...............

The number of unpaired electron(s) in K$_2$NiF$_6$ is ...........

For a cell reaction, Pb(s) + Hg$_2$Cl$_2$(s) → PbCl$_2$(s) + 2Hg(l), $\left( \frac{\partial E^\circ}{\partial T} \right)_P$ is 1.45 × 10$^{-4}$ V K$^{-1}$. The entropy change (in J mol$^{-1}$ K$^{-1}$) for the reaction is ..........

The number of isomeric structures of di-substituted borazine (B$_3$N$_3$H$_4$X$_2$) is ..........

IR active molecule(s) is/are

Wave nature of electromagnetic radiation is observed in

The number of S–S bond(s) in tetrathionate ion is ..........

Intensive variable(s) is/are

Jahn-Teller distortion is observed in octahedral complexes with d-electron configuration of

The “heme” containing protein(s) is/are

The INCORRECT statement(s) among the following is/are

Among the following, the correct statement(s) is/are

The indicator(s) appropriate for the determination of end point in the titration of a weak acid with a strong base is/are

Among the following, the species having see-saw shape is/are

For a particle in a one-dimensional box of length L with potential $V(x)=0$ for $0<L>x>0$ and $V(x)=\infty$ otherwise, an acceptable wave function consistent with the boundary conditions is

For a first order reaction $A(g) \rightarrow 2B(g) + C(g)$, the rate constant in terms of initial pressure $p_0$ and pressure at time $t$ ($p_t$), is given by

Ionisation energy of hydrogen atom in ground state is 13.6 eV. The energy released (in eV) for third member of Balmer series is

The homogeneous catalyst used in water-gas shift reaction is

The coordination number of Al in crystalline AlCl$_3$ and liquid AlCl$_3$, respectively, is

The correct order of enthalpy of hydration for the transition metal ions is