21.

Write the equation for the following reaction:

Magnesium sulphate solution is mixed with barium chloride solution.

Write the equation for each of the following reaction;

zinc oxide is treated with sodium hydroxide solution.

LPG stands for liquefied petroleum gas. Varieties of LPG are marketed including a mixture of propane (60%) and butane (40%). If 10 litre of this mixture is burnt find the total volume of carbon dioxide gas is added to the atmosphere. Combustion

C₃H₈(g) +5O₂(g)----> 3CO₂(g) +4H₂O(g)

2C₂H_10(g) +13O₂(g) -------> 8CO₂(g) +10H₂O (g)

Calculate the percentage of nitrogen and oxygen in ammonium nitrate. (relative molecular mass of ammonium nitrate is 80, H=1, N=14, O=16.)

Three different electrolytic cells A, B, and C are connected in separate circuits. Electrolytic cell A contains sodium. When the circuit has completed a bulb in the circuit glows brightly. Electrolytic cell B contains an acetic acid solution and in this case, the bulb in the circuit glows dimly. The electrolytic cell C contains sugar solution and the bulb does not glow. Give a reason for each of this observation.

Name the main constituent metal in the following alloys:

Duralumin 

Name the main constituent metal in the following alloys:

Brass

Name the main constituent metal in the following alloys:

Stainless steel. 

State your observation for the following cases:

Glass rod dipped in ammonium hydroxide is brought near the mouth of the concentrated hydrochloric acid bottle.

The diagram shows simple arrangement of the fountain experiment:

(i)Name the two gases you have studied which can be used in this experiment.

(ii) What is the common property demonstrated by this experiment?