An experiment showed that in a lead chloride solution 6.21g of lead combined with 4.26g of chlorine. What is the empirical formula of this chloride? (Pb =207, Cl=35.5)

Name the ore of zinc containing its sulphide.

23.

In the process of extracting zinc, the above-named ore is roasted. Write the equation for the reaction which takes pace when the sulphide ore is roasted.

Name the substance used to reduce the roasted ore. Write the equation for the reaction.

Iron is removed from a blast furnace as a liquid. State how zinc leaves a furnace?

Write te equations for the reaction of zinc with each of the following:
Sodium hydroxide solution

Write the equations for the reaction of zinc with each of the following:

Dilute sulphuric acid.

Write the equations for the reaction of zinc with each of the following:

Copper sulphate solution

A flask contains 3.2 g of sulphur dioxide. Calculate the following:
i) The moles of sulphur  dioxide present in the flask.
ii) The number of molecules of sulphur dioxide presents in the flask.
iii) The volume occupied by 3.2g of sulphur dioxide at S.T.P.
(S=32, O=16)

The reaction of potassium permanganate (VII) wit acidified iron (II) sulphate is given below: 
2KmNO₄ +10FeSO₄ + 8H₂SO₄ ---> K₂SO₄ +2MnSO₄ +5Fe₂(SO₄)₃ +H₂O
if 15.8g of potassium permanganate (VII) was used in the reaction, calculate the mass of iron (II) sulphate used in the above reaction.
(K=39, Mn=55. Fe =56, S=32, O=16)