In the laboratory preparation, HCl gas is dried by passing through: [1]Dilute nitric acidConcentrated sulphuric acidDilute sulphuric acidAcidified water

State a relevant reason for the following: [2](a) Hydrogen chloride gas cannot be dried over quick lime.(b) Ammonia gas is not collected over water.

Match the Column A with Column B: [5]Column AColumn B(a) Sodium chloride1. has two shared pair of electrons(b) Methane2. has high melting and boiling points(c) Hydrogen chloride gas3. a greenhouse gas(d) Oxidation reaction4. has low melting and boiling points(e) Water5. Zn − 2e− ⟶ Zn2+6. S + 2e− ⟶ S2−

The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is: [1]Fe(OH)2Cu(OH)2Ca(OH)2Fe(OH)3

The nitrate which on thermal decomposition leaves behind a residue which is yellow when hot and white when cold: [1]Lead nitrateAmmonium nitrateCopper nitrateZinc nitrate

The acid which does not form acid salt by a basic radical: [1]H2CO3H3PO4H2SO4CH3COOH

An example of a cyclic organic compound is: [1]PropenePenteneButeneBenzene

The hydrocarbon formed when sodium propanoate and soda lime are heated together: [1]MethaneEthaneEthenePropane

The indicator which changes to pink colour in an alkaline solution is: [1]Blue LitmusMethyl OrangeRed LitmusPhenolphthalein

The general formula of hydrocarbons with single covalent bonds is: [1]CnH2n+2CnH2nCnH2n−2CnH2n−6

Which of the following reactions takes place at the anode during the electroplating of an article with silver? [1]Ag − 1e− ⟶ Ag1+Ag + 1e− ⟶ Ag1−Ag − 1e− ⟶ AgNone of the above

The salt formed when concentrated sulphuric acid reacts with KNO3 above 200°C: [1]K2SO4K2SO3KHSO4KHSO3