Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]

Which of these alloys contains copper?

If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density.

Sieving is a technique used to separate mixtures containing solid particles of

3H\(_{2(g)}\)+ N\(_{2(g)}\)⇔ 2NH\(_{3(g)}\) ; H= -ve
In the reaction above, lowering of temperature will