The pH of a solution made by mixing 50 mL of 0.01 M barium hydroxide solution with 50 mL of H₂O is

The concentration of hydrogen ion in a sample of soft drink is $3.8$ $\times {10}^{-3}$ $\mathrm{M}$. The  pH of the soft drink will be:

1. 3.14

2. 2.42

3. 11.58

4. 6.00

The number of ${\mathrm{H}}^{\oplus }$ ions present in 1 ml of a solution whose pH= 4 , is given as:

($N_A=$ $Avogadro\text{'}s$ $number$)

1. ${10}^{-7}{N}_A$

2. ${10}^{-8}{N}_A$

3. ${10}^{-16}{N}_A$

4. ${10}^{-14}{N}_A$

The ionisation constant of an acid, K_a , is the measure of the strength of an acid. The K_a values of acetic acid, hypochlorous acid and formic acid are $1.74\times {10}^{-5}, 3.0\times {10}^{-8}$ and $1.8\times {10}^{-4}$ , respectively. The  correct order of pH value of 0.1 mol dm^-3 solutions of these acids is -

1. Acetic acid > hypochlorous acid > formic acid

2. Hypochlorous acid < acetic acid > formic acid

3. Formic acid > hypochlorous acid > acetic acid

4. Formic acid < acetic acid < hypochlorous acid

0.561 g of KOH is dissolved in water to give 200 mL of solution at 298 K. The pH of the solution will be

The ionization constant of acetic acid is 1.74 × 10^–5. The pH of acetic acid in its 0.05 M solution will be:

The ionization constant of propanoic acid is 1.32 × 10^–5. The degree of ionization of 0.05M acid solution will be:

1. $\mathrm{\alpha }$ = 0.63 x 10^-2

2. $\mathrm{\alpha }$ = 1.63 x 10^-4

3. $\mathrm{\alpha }$ = 1.63 x 10^-2

4. $\mathrm{\alpha }$ = 0.05 x 10^-2