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CAPF ACs 2021 Q17

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1. When calcium metal reacts with sulphuric acid, the reaction stops after a short while. Why?

The reaction of calcium with sulphuric acid is not feasible at room temperature

Formed calcium sulphate is insoluble in water and covers the calcium metal, preventing it from reacting any further

Formed calcium sulphate requires two molecules of water to crystallize as gypsum

Formed calcium sulphate is unstable

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