Question

Match the following:

• A. P-IV, Q-I, R-III, S-II
• B. P-IV, Q-III, R-II, S-I
• C. P-I, Q-II, R-III, S-IV
• D. P-I, Q-IV, R-II, S-III

Answer 1

Answer: (A)

P-IV, Q-I, R-III, S-II

Answer 2

P (Expansion of metals on heating) is a physical change (IV). R (Burning of a candle) involves both melting of wax (physical) and combustion (chemical), hence it's a combination of physical and chemical changes (III). S (Curdling of milk) involves the formation of new chemical substances, hence it's a chemical change (II). Given these strong matches, option (A) is the only one that fits. This implies that Q (A stone kept in the sunlight), in the context of this question's options, is considered neither a physical nor a chemical change (I), likely due to the absence of significant changes in composition or state. Therefore, the correct matching is P-IV, Q-I, R-III, S-II.