Both I and II

I only

II only

None of these

Both I and II

I only

II only

None of these

Both I and II

I only

II only

Neither of these options

and

and

and

and

A solution of ammonia and ammonium chloride

A solution of sodium chloride and sodium hydroxide

Potassium hydroxide

Water

A solution of carbonic acid and sodium chloride

consists of a mixture of a weak acid and its conjugate base, which resists change in pH

allows for a solution to easily change pH value without requiring great addition of strong acid or strong base

is slightly acidic and is used in laboratory settings to prevent chemical reactions from taking place

is slightly basic and is used in laboratory settings to prevent chemical reactions from taking place

None of these

1M Acetic Acid

2M Formic Acid

4M Nitric Acid

3M Rubidium Hydroxide

its conjugate base

another weak acid

a strong base

its conjugate acid

Acetic acid (pKa = 4.7)

Carbonic acid (pKa = 6.3)

Formic acid (pKa = 3.7)

Hydrocyanic acid (pKa = 9.2)

Uric acid (pKa = 3.9)