Chemistry
Give one significant observation when:
(a) a solution of barium chloride is added to zinc sulphate solution.
(b) lead nitrate is heated in a test tube.
(c) chlorine gas is passed over moist starch iodide paper.
Related Questions
Justify the following statements:
(a) Anode is known as the oxidizing electrode.
(b) Graphite electrodes are preferred in the electrolysis of molten lead bromide.
The reaction between concentrated sulphuric acid and magnesium can be represented by the equation given below:
Mg + 2H2SO4 ⟶ MgSO4 + 2H2O + SO2
If 60 g of magnesium is used in the reaction, calculate the following:
(a) The mass of sulphuric acid needed for the reaction.
(b) The volume of sulphur dioxide gas liberated at S.T.P.
[Atomic weight: Mg=24, H=1, S=32, O=16]A gas cylinder can hold 150 g of hydrogen under certain conditions of temperature and pressure. If an identical cylinder with the same capacity can hold 450 g of gas ‘G’ under the same conditions of temperature and pressure, find:
(a) the vapour density of the gas ‘G’.
(b) the molecular weight of gas ‘G’.