A black colour substance X is hard and porous when it is burnt in the presence of air it produces against why which turns limewater milky name X and Y and the equations involved.chapter coal and petroleum

A black colour substance X is hard and porous when it is burnt in the

1.	A black colour substance X is hard and porous when it is burnt in the presence of air it produces against why which turns limewater milky name X and Y and the equations involved.chapter coal and petroleum
Answer» X is coal Y is carbondioxide C + O2 = CO2