Question

1) by squeezing lemon on a piece of rock the gas liberated turns lime water milky which compound is present in the rock

2) the label on the bottle of chemical is spoiled how will you find whether the chemical is acidic or not???

Answer 1

1) carbon-di-oxide is present in the rock.

2) count the number of hydrogens present before and after the reaction. If the number increases it is acidic.