State one observation each for the following: Manganese dioxide is heated with conc. HCI.

State the observation for each of the following: Iron[II] sulphide is heated with dilute sulphuric acid and the gas evolved passed through lead acetate solution.

State one function of each of the following: Diaphragm

State one observation each for the following: Silver nitrate solution is added to dilute hydrochloric acid.

State one observation for the following Conentrated nitric acid is reacted with - sulphur.

State your observation in the following case: When calcium hydroxide is heated with ammonium chloride crystals.

State one observation for each of the following: Sodium hydroxide solution is added to ferric chloride solution first drop by drop and then in excess.

State one observation for each of the following: Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.

State your observations in each of the following: Ammonium sulphate is heated with sodium hydroxide soln. and the gas evolved bubbled through copper sulphate solution

State your observations in each of the following: 1,2, dibromoethane is boiled with hot conc. alcoholic caustic potash and the gas evolved bubbled through ammoniacal cuprous chloride solution.

State one observation for the following: Lead nitrate is heated strongly in a test tube.