Which of the following fertilizers is richest in nitrogen content?
A. Ammonium sulfate
B. Calcium ammonium nitrate
C. Urea
D. Sodium nitrate
Answer: Option C
Solution (By JKExamLibrary)
Urea has about 46% N, highest among solid fertilizers. Ammonium sulfate 21%, sodium nitrate 16%, CAN about 25%. Urea is the most widely used nitrogen fertilizer.
Explanation:
For silver electroplating, the electrolyte is typically a solution of silver cyanide (AgCN) in excess potassium cyanide or silver nitrate (AgNO₃). AgNO₃ with proper complexing agents can be used. CuSO₄ is for copper plating. NaCl is not suitable. The anode is pure silver, cathode is the article. Silver ions migrate to cathode and are reduced to metal.
Explanation:
Zinc coating (galvanizing) provides both barrier and sacrificial protection. Even if scratched, zinc corrodes instead of iron because it is more reactive.
Explanation:
Gay-Lussac's law states that at constant volume, the pressure of a fixed mass of gas is directly proportional to its absolute temperature. P ∝ T, so P/T = constant. This is used in pressure cookers and autoclaves.
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