Strength of acids and bases — task. Chemistry CBSE Live product, Class 10 (2025-26).

Select the correct answer:

1. Sanjay brings dry \(HCl\) gas near blue litmus paper. No colour change occurs. When he moistens the litmus paper, it turns red. What explains this observation?

Water removes acidity
Dry gases always bleach litmus
Water allows \(HCl\) to ionise and release ions
Moisture dilutes the acid

2. Which of the following statements is correct about concentrated and dilute acids?

Concentrated acid always has more \(H^+\) ions than dilute acid per unit volume
Dilute acid has less water and more acid
Concentrated acid is less reactive than dilute acid
Dilute acid is weak, concentrated acid is always strong

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1. Strength of acids and bases

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