KCET · Chemistry · Some Basic Concepts of Chemistry

Select the INCORRECT statement/s from the following:
(a) 22 books have infinite significant figures
(b) In the answer of calculation \(2.5 \times 1.25\) has four significant figures,.
(c) Zero's preceding to first non-zero digit are significant
(d) In the answer of calculation \(12.11+18.0+1.012\) has three significant figures

A \(b, c\) and \(d\)
B b and c only
C b and d only
D \(a\) and \(b\) only

Verified Solution

Answer & Solution

Correct Answer

(B) b and c only

Step-by-step Solution

Detailed explanation

Statement (b): \(2.5\) (2 sf), \(1.25\) (3 sf). Product result has 2 sf. Statement says 4 sf. \(\therefore\) (b) is incorrect. Statement (c) is incorrect. Zeros preceding the first non-zero digit (leading zeros) are not significant.

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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