Sample Quiz

\(\mathrm{AB}_{3}\) is an interhalogen T-shaped molecule. The number of lone pairs of electrons on \(\mathrm{A}\) is _______  (Integer answer)

These are physical properties of an element

(A) Sublimation enthalpy

(B) Ionisation enthalpy

(C) Hydration enthalpy

(D) Electron gain enthalpy

The total number of above properties that affect the reduction potential is _________ (Integer answer)

Of the following four aqueous solutions, total number of those solutions whose freezing point is lower than that of \(0.10  \mathrm{M}  \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) is _____(Integer answer)
(i) \(0.10  \mathrm{M}  \mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2}\)
(ii) \(0.10  \mathrm{M}  \mathrm{Na}_{2} \mathrm{SO}_{4}\)
(iii) \(0.10  \mathrm{M}  \mathrm{KCl}\)
(iv) \(0.10  \mathrm{M}  \mathrm{Li}_{3} \mathrm{PO}_{4}\)

The \(\mathrm{OH}^{-}\)concentration in a mixture of \(5.0 \mathrm{~mL}\) of \(0.0504  \mathrm{M}  \mathrm{NH} 4 \mathrm{Cl}\) and \(2 \mathrm{~mL}\) of \(0.0210  \mathrm{M}  \mathrm{NH}_{3}\) solution is \(x \times 10^{-6}  \mathrm{M}\). The value of \(x\) is _____ (Nearest integer)
\(\left[\right.\) Given \(\mathrm{K}_{\mathrm{w}}=1 \times 10^{-14}\) and \(\mathrm{K}_{\mathrm{b}}=1.8 \times 10^{-5}\) ]

The number of \(4 f\) electrons in the ground state electronic configuration of \(\mathrm{Gd}^{2+}\) is _____
[Atomic number of \(\mathrm{Gd}=64\) ]

The ratio of number of water molecules in Mohr’s salt and potash alum is ____ \(\times 10^{-1}\).

The following data was obtained for chemical reaction given below at \(975 \mathrm{~K}\).
\(2 \mathrm{NO}_{(\mathrm{g})}+2 \mathrm{H}_{2(\mathrm{~g})} \rightarrow \mathrm{N}_{2(\mathrm{~g})}+2 \mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}
\)
\([\mathrm{NO}]            \quad\left[\mathrm{H}_{2}\right] \quad\)              Rate
\(\mathrm{mol} \mathrm{L}^{-1} \quad \mathrm{~mol} \mathrm{~L}^{-1} \quad \mathrm{~mol} \mathrm{~L} \mathrm{~s}^{-1}\)
(A) \(8 \times 10^{-5} \quad 8 \times 10^{-5} \quad 7 \times 10^{-9}\)
(B) \(24 \times 10^{-5} \quad 8 \times 10^{-5} \quad 2.1 \times 10^{-8}\)
(C) \(24 \times 10^{-5} \quad 32 \times 10^{-5} \quad 8.4 \times 10^{-8}\)
The order of the reaction with respect to \(\mathrm{NO}\) is _____. [Integer answer]

The Born-Haber cycle for \(\mathrm{KCl}\) is evaluated with the following data :
\(\Delta_{f} \mathrm{H}^{\ominus}\) for \(\mathrm{KCl}=-436.7 \mathrm{~kJ} \mathrm{~mol}^{-1}\);
\(\Delta_{\text {sub }} \mathrm{H}^{\ominus}\) for \(\mathrm{K}=89.2 \mathrm{~kJ} \mathrm{~mol}^{-1}\);
\(\Delta_{\text {ionization }} \mathrm{H}^{\ominus}\) for \(\mathrm{K}=419.0 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta_{\text {eletron  gain}} \mathrm{H}^{\ominus}\) for \(\mathrm{Cl}_{(g)}\)
\(=-348.6 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta_{\text {bond}} \mathrm{H}^{\ominus}\) for \(\mathrm{Cl}_{2}=243.0 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
The magnitude of lattice enthalpy of \(\mathrm{KCl}\) in \(\mathrm{kJ} \mathrm{mol}^{-1}\) is _____ (Nearest integer)

The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, at pH \(12.5\) will be _____ (Integer answer)

An aqueous \(\mathrm{KCl}\) solution of density \(1.20 \mathrm{~g} \mathrm{~mL}^{-1}\) has a morality of \(3.30 \mathrm{~mol} \mathrm{~kg}^{-1}\)The morality of the solution in \(\mathrm{mol} \mathrm{L}^{-1}\) is _____ (Nearest integer) [ Molar mass of \(\mathrm{KCl}=74.5]\)