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31. Which of these compounds is a binary compound?
NaCl
MgSO4
NaOH
HCN


32. Which of these compounds is a ternary compound?
NaCl
H2O
NaOH
MgBr2



All of the substances listed below are fertilizers that contribute nitrogen to the soil.
Which of these is the richest source of nitrogen on a mass percentage basis?
Urea, (NH2)2CO
Ammonium nitrate, NH4NO3
Guanidine, HNC(NH2)2
Ammonia, NH3