(i) Write one use of the following alloys:
(a) Bronze
(b) Fuse metal

(ii) Draw the electron dot structure for the following:
(a) Ammonium ion
(b) A molecule of nitrogen
[At. No.: N =7, H = 1]

(iii) Give a balanced chemical equation for the following conversions with conditions:
(a) Ethene from ethanol
(b) Ethyne from calcium carbide
(c) Monochloromethane from methane

(iv) Study the following ohservations and name the anions present in each of the reactions.
(a) When a crystalline solid 'P' is wamed with concentrated H₂SO₄ and copper turnings a reddish brown gas is released.
(b) When few drops of dilute sulphuric acid is added to Salt 'R' and heated, a colourless gas is released which turns moist lead acetate paper silvery black.
(c) When few drops of barium nitrate solution is added to the salt solution 'Q', a white precipitate is formed which is insoluble in HCl.

Solution

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