Question

Q1 A compound X used in whitewashing. when it reacts with H2O to form y. when carbon dioxide is passed through y it forms Z .then Z is heated strongly it again forms x.
○identify x y and z
○write chemical reaction for all its conversion
○what happens when excess carbon dioxide is passed through y?

Q2 a white colour compound X gives brown flames of Y on heating
○identify X and Y
○write complete reaction
○identify the type of reaction

Answer these 2 questions class 10 ch 1 sc

Answer 1

Answer:

1.calcium oxide is compound X

when CaO reacts with H20 ,Ca(OH)2 I.e compound y is formed.

compound Z is calcium carbonate.

when excess CO2 is passed thru y milky white appears bcoz calcium carbonate is insoluble in water

2. Pb(NO3)2 Lead Nitrate is compound X

brown flames of Y is nitrogen

It is a decomposition reaction (heat)