Chemistry
Identify the salts P, Q, R from the following observations:
(i) Salt P has light bluish green colour. On heating, it produces a black coloured residue. Salt P produces brisk effervescence with dil. HCl and the gas evolved turns lime water milky, but no action with acidified potassium dichromate solution.
(ii) Salt Q is white in colour. On strong heating, it produces buff yellow residue and liberates reddish brown gas. Solution of salt Q produces chalky white insoluble ppt. with excess of ammonium hydroxide.
(iii) Salt R is black in colour. On reacting with conc. HCl, it liberates a pungent greenish yellow gas which turns moist starch iodide paper blue black.
Practical Chemistry
ICSE 2020
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Answer
(i) Copper carbonate
(ii) Lead nitrate
(iii) Manganese dioxide
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Related Questions
Match the gases given in column I to the identification of the gases mentioned in column II
Column I Column II (i) Hydrogen sulphide A : Turns acidified potassium dichromate solution green (ii) Carbon dioxide B: Turns lime water milky (iii) Sulphur dioxide C: Turns reddish brown when it reacts with oxygen D: Turns moist lead acetate paper silvery black. Distinguish between the following pairs of compounds using a reagent as a chemical test:
(i) Calcium nitrate and Zinc nitrate solution
(ii) Magnesium chloride and Magnesium nitrate solution
The following materials are provided – solutions of cobalt chloride, ammonia, potassium permanganate, lime water, starch-iodide, sodium hydroxide, lead acetate, potassium iodide. Also provided are litmus and filter papers, glowing splinters and glass rods. Using the above how would you distinguish between :
(a) a neutral, acidic and a basic gas
(b) oxygen and hydrogen gas
(c) carbon dioxide and sulphur dioxide gas
(d) chlorine and hydrogen chloride gas
(e) hydrogen sulphide and nitrogen dioxide gas
(f) ammonia and carbon dioxide gas
(g) zinc carbonate and potassium nitrate
(h) hydrated copper sulphate and anhydrous copper sulphate
(i) ammonium sulphate and sodium sulphate.
Give a chemical test to distinguish between the following:
(i) Sodium carbonate and sodium sulphate
(ii) Potassium chloride and potassium nitrate
(iii) Copper carbonate and copper sulphite
(iv) Lead chloride and lead sulphide
(v) Iron (II) sulphate and iron (III) sulphate
(vi) Calcium sulphate and zinc sulphate
(vii) Lead nitrate and zinc nitrate
(viii) Copper sulphate and calcium sulphate
(ix) Manganese dioxide and copper (II) oxide
(x) dil. HCl, dil. HNO3, dil. H2SO4.
[explain the procedure for the preparation of the solutions for the above tests wherever required]