Answer
a) $Fe_{2}O_{3} +3Mg → 3MgO + 2Fe$
ferric oxide + magnesium → magnesium oxide + iron
b) $AlCl_{3} + 3NaOH → Al(OH)_{3} + 3NaCl$
Aluminum chloride + sodium hydroxide → Aluminum hydroxide + sodium chloride
c) $2NaNO_{3} + H_{2}SO_{4} → Na_{2}SO_{4} + 2HNO_{3}$
sodium nitrate + sulfuric acid → sodium sulfate + nitric acid
d) $NiCO_{3} + 2HNO_{3} → Ni(NO)_{3} + CO_{2} + H_{2}O$
nickel carbonate + nitric acid → nickel nitrate + water
Work Step by Step
a) $Fe_{2}O_{3} +3Mg → 3MgO + 2Fe$
ferric oxide + magnesium → magnesium oxide + iron
one moles of ferric oxide reacts with three moles of magnesium to form three moles of magnesium oxide and two moles of iron in free state.
b) $AlCl_{3} + 3NaOH → Al(OH)_{3} + 3NaCl$
Aluminium chloride + sodium hydroxide → Aluminium hydroxide + sodium chloride
one mole of aluminium chloride reacts with three moles of sodium hydroxide to form one mole of aluminium hydroxide and three moles of sodium chloride.
c) $2NaNO_{3} + H_{2}SO_{4} → Na_{2}SO_{4} + 2HNO_{3}$
sodium nitrate + sulfuric acid → sodium sulfate + nitric acid
d) $NiCO_{3} + 2HNO_{3} → Ni(NO)_{3} + CO_{2} + H_{2}O$
nickel carbonate + nitric acid → nickel nitrate + water
