KCET 2025 Chemistry Paper

Let's check each statement:
(a) "22 books have infinite significant figures."
- A counted quantity is exact ⇒ effectively infinite sig figs. ⇒ Correct
(b) "In the answer of 2.5×1.25 there are four significant figures."
- 2.5 has 2 sig figs, 1.25 has 3⇒ product limited to 2 sig figs ⇒ Incorrect
(c) "Zeros preceding the first non-zero digit are significant."
- Leading zeros are not significant ⇒ Incorrect
(d) "In 12.11+18.0+1.012 the result has three significant figures."
- Add ⟶ match decimal places (fewest is 1 place) ⇒ result ≈31.1⇒3 sig figs ⇒ Correct
Incorrect statements are (b) and (c) only ⇒ Option B.