Atoms and Molecules

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1. One of the forms of a naturally occurring solid compound P is usually used for making the. floors of house.On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HC1 to P. Gas Q is said to cause global wanning whereas solid R is used for white-washing.