Question 1: Select the correct expression regarding ionic product of water.

Kw = [H+ ][OH– ]
Kw = [H+ ]/[OH– ]
Kw = [OH– ]/ [H+ ]
Kw = [H+ ][OH– ]2

Question 2: The concentration of H+ has been found out experimentally at 298 K is ----

1.0 × 10–14 M
1.0 × 10–7 M
1.0 × 10–10 M
2.0 × 10–7 M

Question 3: Which one of the following is correct for an acidic solution

[H3O+]< [OH– ]
[H3O+] > [OH– ]
[H3O+] = [OH– ]
[H3O+] >= [OH– ]

Question 4: Select the correct definition about the pH scale

The logarithm to base 10 of the activity (aH ) +
The negative logarithm to base 10 of the activity (aH ) +
The negative logarithm to base 10 of the activity (aOH ) -
The logarithm to base 10 of the activity (aOH ) -

Question 5: The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10–3M. what is its pH?

3.42
0.58
2.42
1.42