Question

Which of the following are better fertilizers: potassium phosphate $\left[K_{3}P{O}_4\right]$ or potassium nitrate $\left[KN{O}_3\right]$?

• A. $K_{3}P{O}_4$
• B. $4KN{O}_3$
• C. both have same
• D. none of these

Answer 1

The correct option is A $K_{3}P{O}_4$

$K_{3}P{O}_4-$
Molar mass - $212gm$
% K $=117/212=55.18$
$KN{O}_3$
Molar mass - $101.1gm$
% of K$=39\times \frac{100}{101.1}=38.61$
As $K_{3}P{O}_4$ have higher % of $K$ so its better fertilizer.