Answer:

Explanation:
From the equation attached ,
is reduced. This is because reduction is equivalent to decrease in the oxidation number. In the equation , The oxidation number of Ni is reduced from +2 to 0.
NB, The oxidation number of a neutral atom is zero
Answer:
A. Nutrients are released into the soil
Answer:
nitric acid will be if you get you will pixel purpose
Two independent variables could change at the same time, and you would not know which variable affected the dependent variable
1. Mg + CuSO4 —> MgSO4 + Cu
=> Single displacement reaction
2. 2HCI + Mg(OH)2 —> MgCI2 + H2O
=> Acid - base reaction
3.AgNO3 + NaCI —> AgCI + NaNO3
=> Double displacement reaction