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Practical Work
State one relevant observation for each of the following:
i) When a crystal of copper nitrate is heated in a test tube.
iii) When hydrogen sulphide gas is passed through lead acetate solution.
i)
a) When a crystal of copper nitrate is heated, it releases reddish brown gas NO2 turns freshly prepared ferrous sulphate solution brown.
b) The residue left is a black copper oxide.
iii) When hydrogen sulphide gas is passed through lead acetate solution, then yellow lead acetate paper turns greyish black with hydrogen sulphide gas due to the formation of lead (II) sulphide.
Identify the anion present in each of the following compounds;
i) A salt M on treatment with concentrated sulphuric acid produces a gas which fumes in the moist air gives dense fumes with ammonia.
ii) A salt D on treatment with dilute sulphuric acid produces a gas which turns lime water milky but has no effect on acidified potassium dichromate solution.
iii) When barium chloride solution is added to salt solution E a white precipitate insoluble in dilute hydrochloric acid is obtained.
i) M =Chloride (Cl) -
ii) D = Carbonate (CO32-)
iii) E = Sulphate (SO42-)
Q7. (c) from the list of the following salts choose the salt that most appropriately fits the description given in the following:
[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3,Ca(NO3)2]
i) A deliquescent salt
ii) An insoluble chloride
iii) On heating, this salt gives a yellow residue when hot and white when cold.
iv)On heating this salt, a brown coloured gas is evolved.
i) A deliquescent salt MgCl2
ii) An insoluble chloride - AgCl
iii) ZnCO3
iv) Ca(NO3)2
Write a balanced chemical equation for the preparation of the following salts:
Copper carbonate
3Cu +2HNO3 → 3CuO + H2O + 2NO
CuO + H2SO4 → CuSO4 + H2O
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Mock Test Series
Mock Test Series