Question 7(a)Give a chemical test to distinguish between the following pairs of chemicals:(i) Lead nitrate solution and Zinc nitrate solution(ii) Sodium chloride solution and Sodium nitrate solution

Question

Accepted Answer

(i) When NaOH is added to each of the compounds, lead nitrate forms a chalky white precipitate of lead hydroxide [Pb(OH)₂] whereas a gelatinous white precipitate of zinc hydroxide [Zn(OH)₂] is formed in case of zinc nitrate.

(ii) Add silver nitrate soln. to the given solns., sodium chloride reacts to form a white ppt. which is soluble in NH₄OH and insoluble in dil. HNO₃. The other soln. is sodium nitrate.

NaCl + AgNO₃ ⟶ AgCl + NaNO₃

NaNO₃ + AgNO₃ ⟶ no white ppt.

Solved 2018 Question Paper ICSE Class 10 Chemistry — Question 17

Question 7(a)