Please answer fast.. its kinda urgent! :)

1. which gas is evolveswhen acid is added to lime water?

2. does decomposition takes place only on heating?

3. name the reactive which forms insoluble salts?

4. write all your observations when the following substances are heated strongly in a boiling tube.

(i) ferrous sulphate crystals.

(ii) lead nitrate crystals

5. a solution of copper sulphate was kept in an iron vessel. after a few days, the iron vessel was found to have a no. of holes in it. explain giving relevant chemical equation.

6. identify which substance is getting oxidised and reduced in the following:

(i) 2H₂S + 3O₂ (GIVE RISE TO) 2SO₂ + 2H₂O

(II) MnO₂ + 4HCl (GIVE RISE TO) MnCl₂ + 2HCl + Cl₂

7. TRUE OR FALSE

a) green crystals of ferrous sulphate become dirty white upon strong heating.

b) rancidity of eatables is due to oxidation

c) ionic reactions taking place in aqueous solution are generally fast.

d) silver can displacecopper from an aqueous solution of copper sulphate

e) an oxidation reaction can proceed only in the company of a reduction reaction.

f) the precipate of copper sulphide is red in colour

g) in chemical reactions, reactant species simply exchange partners

h) the chemical formula of aluminium phosphate is Al(PO₄)₃

i)a reducing agent undergoes reduction in a redox reaction.

j) the milkiness of lime water on passing carbon dioxide is due to the formation of calcium hydrogen carbonate.

8. what type of reactions are represented by the following equations?

a) NH4NO2 (GIVE RISE TO) N2 + 2H2O

b)CuSO₄ + 2NaOH (GIVE RISE TO) Cu(OH)₂ + H₂SO₄