Assertion (A): Water is carefully added to concentrated sulfuric acid to dilute it.
Reason (R): When concentrated sulfuric acid is diluted, a lot of heat energy is released.

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Detailed Solution

The assertion is incorrect, and the Reason is correct.
Explanation:
Concentrated sulphuric acid is strong. To dilute it, it is added slowly in water. When sulphuric acid is added to concentrated water, it releases heat. The reaction which takes place in this process is exothermic. Therefore, sulphuric acid has a high affinity for water.
Water is never added to concentrated sulphuric acid. In this case, a huge amount of heat will be generated, and it may splash acid on our faces.
Hence option (d) A is false, but R is true is correct.

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