(a) What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place.
(b) What happens when magnesium reacts with very dilute nitric acid? Write an equation for the reaction involved.

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Solution

(a) Calcium reacts vigorously with chlorine to form calcium chloride, which is an ionic chloride.
Ca(s) + Cl₂(g) $\to$ CaCl₂(s)

(b) When magnesium reacts with very dilute nitric acid, it forms magnesium nitrate and hydrogen gas is evolved.
As the nitric acid is very dilute, it acts as a weak oxidising agent, which is unable to oxidise the hydrogen gas.
Mg(s) + 2HNO₃(aq) $\to$ Mg(NO₃)₂(aq) + H₂(g)

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(a) What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place. (b) What happens when magnesium reacts with very dilute nitric acid? Write an equation for the reaction involved.

(a) What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place.
(b) What happens when magnesium reacts with very dilute nitric acid? Write an equation for the reaction involved.