Chemistry
State one appropriate observation for each of the following:
(i) Concentrated sulphuric acid is added drop wise to a crystal of hydrated copper sulphate.
(ii) Copper sulphide is treated with dilute hydrochloric acid.
(iii) Excess of chlorine gas is reacted with ammonia gas.
(iv) A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed by addition of ammonium hydroxide solution.
(v) Electricity is passed through molten lead bromide.
Sulphuric Acid
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Answer
(i) When concentrated Sulphuric acid is added dropwise to the crystals of hydrated copper sulphate, it changes the colour of hydrated copper Sulphate from blue to white.
(ii) A colourless gas having smell of rotten eggs is given off. The gas evolved is H2S
CuS + 2HCl ⟶ CuCl2 + H2S
(iii) Colourless ammonia gas reacts with greenish yellow excess chlorine giving a yellow explosive liquid (Nitrogen trichloride).
NH3 + 3Cl2 [excess] ⟶ 3HCl + NCl3
(iv) Curdy white precipitate of silver chloride [AgCl] is obtained.
AgNO3 + HCl ⟶ AgCl ↓ + HNO3
(v) At cathode, a silvery grey deposit of lead is observed due to the discharge of lead ions (Pb2+) as neutral lead atoms.
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Related Questions
Write a balanced chemical equation for each of the following
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(ii) Ammonia burns in oxygen.
(iii) Sulphur reacts with conc. nitric acid.
(iv) Calcium hydrogen carbonate with HCl.
(v) Carbon with conc. H2SO4.
Give the structural formula of the following
(i) diethyl ether
(ii) 1-propanal
(iii) acetone
(iv) 1, 2, dichloroethane
(v) ethanoic acid
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(i) sodium propionate is heated with soda lime.
(ii) potassium sulphite is treated with dilute hydrochloric acid.
(iii) Sulphur is treated with concentrated nitric acid.
(iv) a few crystals of KNO3 are heated in a hard glass test tube.
(v) concentrated hydrochloric acid is made to react with manganese dioxide.
From the list given below, select the word(s) required to correctly complete blanks (i) to (v) in the following passage. The words from the list are to be used only once. Write the answers as (a) (i), (ii), (iii) and so on. Do not copy the passage.
[ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt, water]:
(i) A solution M turns blue litmus red, so it must contain (i) …………… ions; another solution O turns red litmus blue and hence, must contain (ii) …………… ions.
(ii) When solution M and O are mixed together, the products will be (iii) ……………and (iv) ……………
(iii) If a piece of magnesium was put into a solution M, (v) …………… gas would be evolved.