When each of the nitrates of Potassium, Magnesium and iron is heated,
-
A.
all the nitrates decompose to their oxides -
B.
the nitrate of magnesium gives the nitrite and oxygen -
C.
the nitrates of iron magnesium and iron give the oxides -
D.
the nitrate of iron gives the nitrite and oxygen -
E.
the nitrate of the magnesium is not decomposed