An NPK fertiliser is made by mixing two compounds.
The first compound has the formula ${\left( {N{H_4}} \right)_2}HP{O_4}$.
What is the formula of the second compound?
1 )
$CaC{O_3}$
$KN{O_3}$
3 )
NaCl
4 )
${\left( {N{H_4}} \right)_2}S{O_4}$
تحلیل ویدئویی تست
تحلیل ویدئویی برای این تست ثبت نشده است!