Question Bank Directory

Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the $H^+$ ion concentration in the mixture?

Among the following examples, the species that behave(s) as a Lewis acid is/are: $\text{BF}_3$, $\text{SnCl}_2$, $\text{SnCl}_4$

The strongest acid among the following compounds is:

Two half cell reactions are given below: $Co^{3+} + e^- \rightarrow Co^{2+} \ ; \ E^{\circ}_{Co^{2+}/Co^{3+}} = -1.81\text{ V}$ $2Al^{3+} + 6e^- \rightarrow 2Al(s) \ ; \ E^{\circ}_{Al/Al^{3+}} = +1.66\text{ V}$ The standard EMF of a cell with feasible redox reaction will be:

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of $\text{pH} = 10$ and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of the electrode would be:

The value of $K_{p_1}$ and $K_{p_2}$ for the reactions $X \rightleftharpoons Y + Z$ ...(i) and $A \rightleftharpoons 2B$ ...(ii) are in the ratio of $9 : 1$. If the degree of dissociation of X and A is equal, then the total pressure at equilibrium (i) and (ii) are in the ratio:

Consider the reaction: $\text{CH}_3\text{CH}_2\text{CH}_2\text{Br} + \text{NaCN} \rightarrow \text{CH}_3\text{CH}_2\text{CH}_2\text{CN} + \text{NaBr}$ This reaction will be the fastest in

Standard electrode potential for $\text{Sn}^{4+}/\text{Sn}^{2+}$ couple is $+0.15 \text{ V}$ and that for $\text{Cr}^{3+}/\text{Cr}$ couple is $-0.74 \text{ V}$. These two couples in their standard state are connected to make a cell. The cell potential will be:

At infinite dilution, equivalent conductances of $Ba^{2+}$ & $Cl^-$ ions are $127$ & $76 \text{ ohm}^{-1}\text{cm}^{-1}\text{ eq}^{-1}$ respectively. Equivalent conductance ($\text{ohm}^{-1}\text{cm}^{-1}\text{ eq}^{-1}$) of $BaCl_2$ at infinite dilution is:

4 gm of NaOH is dissolved in 1000 ml of water. The $\text{H}^+$ ion concentration will be:

Find out the solubility product $K_{sp}$ of $Ca(OH)_2$ if the pH of its saturated solution is 9:

The correct value of cell potential in volts for the reaction that occurs when the following two half cells are connected, is: $Fe^{2+}(aq) + 2e^- \rightarrow Fe(s) \ ; \ E^{\circ} = -0.44\text{ V}$ $Cr_2O_7^{2-}(aq) + 14H^+ + 6e^- \rightarrow 2Cr^{3+} + 7H_2O \ ; \ E^{\circ} = +1.33\text{ V}$

A physician wishes to prepare a buffer solution at $\text{pH}=3.58$ that efficiently resists changes in pH yet contains only small concentration of the buffering agents. Which one of the following weak acids together with its sodium salt would be best to use?

The reaction $2\text{A} + \text{B}(g) \rightleftharpoons 3\text{C}(g) + \text{D}(g)$ begins with the concentrations of A and B both at an initial value of $1.00 \text{ M}$. When equilibrium is reached, the concentration of D is measured and found to be $0.25 \text{ M}$. The value for the equilibrium constant for this reaction is given by the expression:

Which of the following can be used as the halide component for Friedel-Crafts reaction?

A 20 litre container at 400 K contains $CO_2(g)$ at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when the pressure of $CO_2$ attains its maximum value, will be (Given that: $SrCO_3(s) \rightleftharpoons SrO(s) + CO_2(g)$, ($K_p = 1.6\text{ atm}$))

For any reversible reaction, if we increase the concentration of the reactants, the equilibrium constant will:

If the equilibrium constant for $N_2(g) + O_2(g) \rightleftharpoons 2NO(g)$ is $K$, the equilibrium constant for $\frac{1}{2}N_2(g) + \frac{1}{2}O_2(g) \rightleftharpoons NO(g)$ will be?

The ionization constant of ammonium hydroxide is $1.77 \times 10^{-5}$ at $298 \text{ K}$. Hydrolysis constant of ammonium chloride is:

MY and $NY_3$, two nearly insoluble salts, have the same $K_{sp}$ values of $6.2 \times 10^{-13}$ at room temperature. Which statement would be true in regard to MY and $NY_3$?