CBSE Class 10 Science 2019 · Paper 31/4/1 · Question 8(a)

Chemical Reactions and Equations 3 marks Medium

(a) Classify the following reactions into different types :

(i) $AgNO_{3} (aq) + NaCl (aq) ⟶ AgCl (s) + NaNO_{3} (aq)$
(ii) $CaO (s) + H_{2} O (l) ⟶ Ca(OH)_{2} (aq)$
(iii) $2 KClO_{3} (s) Δ 2 KCl (aq) + 3 O_{2} (g)$
(iv) $Zn + CuSO_{4} ⟶ ZnSO_{4} + Cu$ (b) Translate the following statement into a balanced chemical equation : “Barium chloride reacts with aluminium sulphate to give aluminium chloride and barium sulphate.”

Answer

The reactions are double displacement, combination, decomposition and displacement; the balanced equation uses $3 BaCl_{2}$ , $2 AlCl_{3}$ and $3 BaSO_{4}$ .

(a) (i) Double displacement reaction (also a precipitation reaction). (ii) Combination reaction. (iii) Decomposition reaction (thermal decomposition). (iv) Displacement reaction. (b)

3 BaCl_{2} + Al_{2} (SO_{4})_{3} \to 2 AlCl_{3} + 3 BaSO_{4}

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CBSE Class 10 Science 2019 · Paper 31/4/1 · Question 8(a)

Answer

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