Explain the following: (1) Anhydrous `FeCl_(3)` cannot be obtained by heating hydrated `FeCl_(3)`
(2) The colour of mercurous chloride changes from white to black when treated with ammonia solution

Explain the following : (i). FeCl_3 and FeBr_3 are well known, but FeI_3 has doubtful existence. (ii). Anhydrous FeCl_3 cannot be obtained by heating hydrated ferric chloride.

Yellow coloured solution of FeCl_(3) changes in light green when

Which of the following will not form when NaHCO_(3) solution is added to aqueous FeCl_(3) solution ?

Explain the following in not more than two sentences A solution of FeCl_(3) in water gives a brown precipitate on standing .

Explain the following (i) A little acid is always added in the preparation of aqeous ferrous sulphate solution (ii) Aqueous solution of mercuric chloride and stannous chloride cannot exist together . (ii) Ferric iodide is very unstable but ferric chloride is not. (iv) Hg^(2+) and Hg_(2)^(2+) salts are colourless generaly .

Explain the following : When NaCl is added to AgNO_(3) solution, a white precipitate is formed.

When a small quantity of FeCl_(3) solution is added to the fresh precipitate of Fe(OH)_(3) , a colloidal sol is obtained. The process through which this sol is formed is known as

Explain the following reactions (a) Silicon is heated with methyl chloride at high temperature in the presence of copper, (b) Silicon dioxide is treated with hydrogen fluoride, (c) CO is heated with ZnO, (d) Hydrated alumina is treated with aqueous NaOH solution.

Identify(A) based on following facts : a. A reduces HgCl_(2) solution to white ppt. charging to grey . b. (A) turns FeCl_3 yellow colured solution to green . c. (A) give white ppt, with NaOH soluble in excess of NaOH . d. (A) gives yellow dirty ppt. on passing H_2S gas , soluble in yellow ammonium sulphjde (YAS). e. (A) gives chromyl chloride test .

Explain why : A blood red colouration is obtained on addition of FeCl_3 to Lassaigne's solution when the compound contains both N and S.