Chemistry
Identify the anion present in the following compounds :
(i) Compound X on heating with copper turnings and conc. sulphuric acid liberates a reddish brown gas.
(ii) When a solution of compound Y is treated with silver nitrate solution a white precipitate is obtained which is soluble in excess of ammonium hydroxide solution.
(iii) Compound Z which on reacting with dilute sulphuric acid liberates a gas which turns lime water milky, but the gas has no effect on acidified potassium dichromate solution.
(iv) Compound L on reacting with barium chloride solution gives a white precipitate insoluble in dilute hydrochloric acid or dilute nitric acid.
Practical Chemistry
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Answer
(i) Nitrate ion, NO3-
(ii) Chloride ion, Cl-
(iii) Carbonate ion, CO32-
(iv) Sulphate ion, SO42-
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Related Questions
State your observations when:
(a) lead nitrate solution and sodium chloride solution are mixed.
(b) zinc chloride solution, zinc nitrate solution and zinc sulphate solutions are added individually to
(i) barium chloride solution,
(ii) lead nitrate solution.
(c) Decomposition of bicarbonates by dil. H2SO4
2NaHCO3 + H2SO4 ⟶ Na2SO4 + 2H2O + 2CO2
2KHCO3 + H2SO4 ⟶ K2SO4 + 2H2O + 2CO2
(d) Zinc carbonate is heated strongly.
(e) a piece of moist blue litmus paper is introduced in a jar of chlorine.
(f) paper soaked in potassium permanganate solution — is introduced in each case into a jar of sulphur dioxide.
(g) When moist starch iodide paper is introduced into chlorine gas.
Complete the following table and write your observations.
Hydrogen sulphide Ammonia Sulphur dioxide Hydrogen chloride Shake the gas with red litmus solution Shake the gas with blue litmus solution Apply a burning splint to the gas State giving reasons if:
(a) zinc and aluminium can be distinguished by heating the metal powder with concentrated sodium hydroxide solution.
(b) calcium nitrate and lead nitrate can be distinguished by adding ammonium hydroxide solution to the salt solution.
Identify the substance 'R' based on the information given below :
The pale green solid 'R' turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids.