Intext questions VI — task. Science CBSE, Class 10.

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1. How is the concentration of hydronium ions $H_3O^+$ affected when a solution of an acid is diluted?

When an acid solution is diluted, only hydrogen ions are affected.
Strength of acid will not be affected
Strength of acid decreases
Strength of acid increases

2. How is the concentration of hydroxide ions $OH^–$ affected when excess base is dissolved in a solution of sodium hydroxide?

As sodium hydroxide is a base, it does not affect the concentration of hydroxide ions $OH^–$ .
When excess base is dissolved in sodium hydroxide solution, salt and water are formed.
Excess base increases $OH^-$ ion concentration.
Excess base decreases $OH^-$ ion concentration.

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