Question

100 points to whoever answers this Q1. State the type of reaction in the following chemical changes: i) Ammonia and hydrogen chloride react to form ammonium chloride. ii) Chlorine gas is passed through a solution of potassium iodide. iii) Silver nitrate solution and sodium chloride solution are mixed together in a test tube. iv) Lead nitrate crystals are heated in a test tube. Q2. State one important observation in each of the following: i) Zinc carbonate is heated in a test tube. ii) An iron nail is dropped in copper sulfate solution.

Answer 1

A1. (i) backward reaction.

(ii) this is a displacement reaction.

(iii) It is a Double Displacement reaction.

(iv) It is a thermal decomposition reaction.

A2. (i) When Zinc carbonate is heated which is a white powdery solid, gives carbon dioxide and a yellow solid of zinc oxide. As it forms different products, it undergoes chemical changes. On cooling yellow solid turns in to white, which is a physical change.

(ii) When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green.

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