. What are strong acids and weak acids


A: An acid which dissociates completely or almost completely in water are strong acids and an acid that dissociates only partially when dissolved in water are weak acids.

B: An acid which dissociates completely in water are strong acids and an acid which dissociates almost completely in water are weak acids.

C: An acid which do not dissociate completely in water are strong acids and an acid which dissociates almost completely in water are weak acids.

D: An acid that dissociates only partially when dissolved in water are strong acids and an acid which do not dissociate completely in water are weak acids.

Best Answer

Explanation:

Acids are classified as strong or weak depending upon their ionisation in water.

An acid is known as a strong acid if it completely ionizes in an aqueous solution. 

e.g: Hydrochloric acid (HCl), sulphuric acid (H2SO4), etc.

Hydrochloric acid

An acid is known as weak acid if it is only slightly ionized in an aqueous solution.

e.g: Acetic acid (CH3COOH), hydrocyanic acid (HCN), etc.

Acetic acid

 

Final Answer:

Hence, the correct answer is A: An acid which dissociates completely or almost completely in water are strong acids and an acid that dissociates only partially when dissolved in water are weak acids.

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