Q981
Match the following columns: Column I (Available nutrients) Column II (Extractant) a. Boron 1. 0.15% Cacl2 Solution b. Nitrogen 2. Hot water c. Sulpher 3. Alkaline KMNO4
Match the following columns:
| Column I (Available nutrients) | Column II (Extractant) |
| a. Boron | 1. 0.15% Cacl2 Solution |
| b. Nitrogen | 2. Hot water |
| c. Sulpher | 3. Alkaline KMNO4 |
A.
a-2, b-1, c-3
B.
a-1, b-3, c-2
C.
a-2, b-3, c-1
AnswerD.
a-1, b-2, c-3
Answer: Option C
Solution
Answer: Option C
Solution:
a. Hot water is the extractant of Boron.Boron is extracted with near-boiling deionized water on a heating block. Boron in the extract is reacted with curcumin to form an orange-coloured complex. The concentration of B is determined colorimetrically or by UV-Vis spectrophotometry. Each chemical compound should be treated as a potential health hazard.
b. Alkaline KMnO4 is the extractant of Nitrogen.
The easily hydrolyzable and oxidisable fractions of organic nitrogen present in a soil sample can be extracted using alkaline KMnO4 - a mild oxidizing agent.
c. 0.15% Cacl2 solution is the extractant of Sulphur.
0.15% CaCl2 extracted S in the range of 13.00 to 26.50 mg kg-1, with a mean value of 19.26 mg kg-1. The lowest amount of S (mean value of 8.21 mg kg-1) has been extracted by 0.001 M HCl with a range of 3.75 to 14.25 mg kg-1.