35. What happens when sodium sulphate and barium chloride solutions are mixed together ? Write reaction with
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A-35) When solutions of barium chloride and sodium sulphate are mixed together, then an insoluble precipitate of barium sulphate and solution of sodium chloride is obtained. Hence, this reaction is a precipitation (a kind of double displacement reaction) reaction. The chemical equation for reaction between barium chloride and sodium sulphate is represented as follows
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
A-38) Pure water is very weakly ionised and hence does not conduct electricity very well. Sulphuric acid basically increases the conductivity of water, and thereby speeds up the process of electrolysis. However it does not affect the chemical composition of the reactant or products, it only increases the speed of the reaction. Thus it plays the role of a catalyst.
A-44) The said compound is lead nitrate. It is white in colour. When lead nitrate is heated, it decomposes to give lead oxide, nitrogen dioxide and oxygen. Nitrogen dioxide is a brown coloured gas. The chemical equation involved in the reaction is :