Question

Match List-I with List-II:

• A. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
• B. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
• C. (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
• D. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Hint:

Match each test with the nutrient it estimates—Bray for P, Kjeldahl for N, and flame photometry for K.

Answer 1

The Correct Option is D

Kjeldahl method determines nitrogen. Bray P1 is used for phosphorus. Ammonium acetate is for exchangeable K and ammonium. Flame photometry detects K and Na in solutions.

Answer 2

Elimination approach:
Any option pairing the Kjeldahl method with anything other than nitrogen can be discarded immediately, since Kjeldahl digestion and distillation is specifically designed to quantify total nitrogen. Likewise, an option linking Bray P1 extraction to potassium or nitrogen is inconsistent, since Bray P1 is a standard soil-available phosphorus test. Ammonium acetate extraction is the classical method for exchangeable cations, chiefly potassium, while flame photometry is the instrument used afterward to actually read out potassium and sodium concentrations in that extract. Matching each method strictly to its real analytical purpose leaves only the sequence (A)-(III), (B)-(I), (C)-(IV), (D)-(II) internally consistent.