Question

Q1) a solution of a substance 'X'is used for white washing (i) Name the substance 'X' and write its formula (ii) weite the reaction of the substance 'X' named in (i) above with water [Q2) why is the amount of gas collected in one of the test tubes in activity 1.7 double of the amount collected in the other ? name this gas.​

Answer 1

The name of the substance is calcium oxide.

its formula is CaO.

The reaction with water

CaO + H2O   ------   Ca (OH)2  + heat

Answer 2

the substance X is a calcium its calcium formula is a CaO .calcium oxide react with water to form hydroxide CaO(s) +H2O(1) ----->Ca(COH)2 (aq)
calcium oxide quicklime + water--->calcium hydroxide