RoseMarie Gallagher and Paul Ingram Solutions for Chapter: Some Non-Metals and their Compounds, Exercise 3: Q

You can buy a mixture of fertilisers called NPK fertiliser. It contains elements plants need. Why do you think it is called NPK?

Nitrogenous fertilisers are fertilisers that contain nitrogen. Name three nitrogenous fertilisers.

Fertilisers can harm river life. Explain how.

The box in the margin above will remind you how to work out $\%$ composition. Find the $\%$ of nitrogen in ammonium sulphate.

Which would provide more nitrogen: $1 \mathrm{kg}$of ammonium nitrate or $1 \mathrm{Kg}$ of ammonium sulphate?

Make sure not to add fertilisers in the rainy season. Why not?