Problem 1
Ostwald's dilution law is applicable for: (a) Strong electrolyte (b) Weak electrolyte (c) Both strong and weak electrolytes (d) None of these
Problem 1
The reaction \(\mathrm{PCl}_{5}(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{~s})+\mathrm{Cl}_{2}(\mathrm{~g})\) is an example of: (a) Backward reaction (b) Forward reaction (c) Irreversible reaction (d) Reversible reaction
Problem 2
The conjugate base of \(\mathrm{OH}^{-}\) is: (a) \(\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{O}^{2-}\) (c) \(\mathrm{O}^{-}\) (d) \(\mathrm{O}_{2}\)
Problem 3
The ionization constant of phenol is higher than that of ethanol because: (a) Phenoxide ion is bulkier than ethoxide (b) Phenoxide ion is stronger base than ethoxide (c) Phenoxide ion is stabilized through delocalization (d) Phenoxide ion is less stable than ethoxide
Problem 3
The value of \(\mathrm{K}_{\mathrm{p}}\) in the reaction: \(\mathrm{MgCO}_{3}(\mathrm{~s}) \rightleftharpoons \mathrm{MgO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g})\) is (a) \(\mathrm{K}_{\mathrm{p}}=\mathrm{P}\left(\mathrm{CO}_{2}\right)\) (b) \(\mathrm{K}_{\mathrm{p}}=\frac{\mathrm{P}\left(\mathrm{MgCO}_{3}\right)}{\mathrm{P}\left(\mathrm{CO}_{2}\right) \times \mathrm{P}(\mathrm{MgO})}\)
Problem 4
One of the following equilibria is not affected by change in volume of the flask: (a) \(\mathrm{PCl}_{5}(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{~g}) \mathrm{Cl}_{2}(\mathrm{~g})\) (b) \(\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g})\) (c) \(\mathrm{N}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})\) (d) \(\mathrm{SO}_{2} \mathrm{Cl}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g})\)
Problem 4
One of the following species acts as both Bronsted acid and base: (a) \(\mathrm{H}_{2} \mathrm{PO}_{2}^{-}\) (b) \(\mathrm{HPO}_{3}^{2-}\) (c) \(\mathrm{HPO}_{4}^{2-}\) (d) All of the above
Problem 5
At equilibrium total number of moles for the reaction \(2 \mathrm{HI} \rightleftharpoons \mathrm{H}_{2}+\mathrm{I}_{2}\), if \(\alpha\) is degree of dissociation, are: (a) 2 (b) \(2-\alpha\) (c) 1 (d) \(\mathrm{I}-\alpha\)
Problem 5
Which of the following is not true? (a) The conjugate base of \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\) is \(\mathrm{HPO}_{4}^{2-}\). (b) \(\mathrm{pH}+\mathrm{pOH}=14\) for all aqueous solutions. (c) The \(\mathrm{pH}\) of \(1 \times 10^{-8} \mathrm{M} \mathrm{HCl}\) is 8 . (d) 96500 coulombs of electricity when passed through a \(\mathrm{CuSO}_{4}\) solution deposit \(1 \mathrm{~g}\) equivalent of copper at the cathode.
Problem 6
The conjugate base of \(\mathrm{H}_{2} \mathrm{PO}_{4}^{-}\) is: (a) \(\mathrm{HPO}_{4}^{2-}\) (b) \(\mathrm{H}_{3} \mathrm{PO}_{4}\) (c) \(\mathrm{PO}_{4}^{3-}\) (d) \(\mathrm{P}_{2} \mathrm{O}_{5}\)
