What are strong acids and weak acids?

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

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

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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.

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Solution

The correct option 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.
An acid, which dissociates completely or almost completely in water are strong acids. An acid that dissociates only partially when dissolved in water are weak acids.
Strong acid like $H C l, H_{2} S O_{4}$ etc.
Weak acid like $C H_{3} C O O H, H C O O H$ etc

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