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In countries nearer to polar region, the roads are sprinkled with \(\mathrm{CaCl}_{2}\). This is

A to minimise the wear and tear of the roads
B to minimise the snow fall
C to minimise pollution
D to minimise the accumulation of dust on the road

Verified Solution

Answer & Solution

Correct Answer

(A) to minimise the wear and tear of the roads

Step-by-step Solution

Detailed explanation

In countries nearer to polar region, the roads are sprinkled with \(\mathrm{CaCl}_{2}\) because \(\mathrm{CaCl}_{2}\) decreases the freezing point of ice and therefore, minimise the wear and tear of the roads.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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