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NCERT Exemplar · Class 10 · Science

Chapter 2: Acids, Bases and Salts

Practice each question, then open the answer or worked solution.

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Short Answer Questions

12 questions
Q41Written answer

What are strong and weak acids? In the following list of acids, separate strong acids from weak acids. Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid.

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Worked solution

Strong acids are those that get completely ionized and weak acids are those that get partially ionized.

Hydrochloric acid- Strong Acid

citric acid- Weak Acid

acetic acid- Weak Acid

nitric acid – Strong Acid

formic acid- Weak Acid

sulphuric acid- Strong Acid

Q42Written answer

When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.

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Worked solution

When Zinc reacts with Dilute acid solution, the following reaction takes place, and hydrogen gas is evolved

Zn + 2HCl→ ZnCl2 + H2

When Hydrogen gas is brought near a burning flame, it burns with a popping sound, which is the confirmation for the evolution of Hydrogen gas.