A centinormal solution of a monobasic acid is 100% ionized. Its pH is:

1. 2

2. 4

3. 3

4. 1

Find the mixture that can act as a buffer solution.

Which one of the following statements is not correct?

At \(90^\circ \text C,\) pure water has \([H_3O^+]=10^{-6}~\text{mole litre}^{-1}.\) What is the value of \(K_w\) at \(90^\circ \text C?\)

Which of the following anions is the strongest Brønsted base?

1. ${\mathrm{ClO}}_4^{-}$

2. ${\mathrm{ClO}}_3^{-}$

3. ${\mathrm{ClO}}_2^{-}$

4. ${\mathrm{ClO}}^{-}$

What is the pH of a 10⁻⁸ M solution of HCl in water?

1. -8

2. 8

3. between 6 and 7

4. between 7 and 8

Find the pair of solutions that can be mixed to prepare an acidic buffer.

1. Sodium chloride and sodium hydroxide

2. Sulphuric acid and sodium sulphate

3. Ammonium chloride and ammonium nitrate

4. Ammonium acetate and acetic acid

Identify the factor on which the equilibrium constant (Kp) for the reaction
H₂(g) + I₂(g) ⇌ 2HI(g) depends:

1. Catalyst

2. Temperature

3. Total pressure

4. The amounts of H₂ and I₂ present

The best indicator for detection of end point in titration of a weak acid and strong base is

1. methyl red (5 to 6)

2. methyl orange (3 to 4)

3. phenolphthalein (8 to 9.6)

4. bromothymol blue (6 to 7.5)