CBSE Class 10 Science 2023 Outside Delhi Set 1

Question : 17

Total: 39

Assertion (A) : It is advised that while diluting an acid one should add water to acid and not acid to water keeping the solution continuously stirred.
Reason (R) : The process of dissolving an acid into water is highly exothermic.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).
Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.

Solution:

When mixing acid with water, it is extremely important to add the acid to the water rather than the other way around. This is because acid and water react in a vigorous exothermic reaction, releasing heat, sometimes boiling the liquid.

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