Chemistry
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. |
Practical Chemistry
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Answer
| Column I | Column II |
|---|---|
| (i) Hydrogen sulphide | D: Turns moist lead acetate paper silvery black. |
| (ii) Carbon dioxide | B: Turns lime water milky |
| (iii) Sulphur dioxide | A : Turns acidified potassium dichromate solution green |
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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.