(4) who is x
`(HCOO)_2Ca rarr x +CaCO_3`

Temporary hardness is due to bicarbonates of Mg^(2+) and Ca^(2+) . It is removed by addition of CaO as follows: Ca(HCO_(3))_(2) + Cao rArr 2CaCO_(3) + H_(2)O Mass of CaO required to precipitate 2g CaCO_(3) is:

CaCO_(3)(g) overset(Delta)rarr A (s)+B(g) , A(s) +D(s) rarr E(s)+F(g) H(s)+H_(2)O (steam) rarr CaCO_(3)+X (g) In the above reactions, shape of molecule X is:

N_(2)+AI_(2)O_(3) overset("coke")underset(Delta)rarr X +CO uarr , X overset(H_(2)O)rarr Y uarr +Z, CaNCN +H_(2)O rarr Y uarr +CaCO_(3) then X =_____, Y=________, Z = ______

CaCO_(3)(g) overset(Delta)rarr A (s)+B(g) , A(s) +D(s) rarr E(s)+F(g) H(s)+H_(2)O (steam) rarr CaCO_(3)+X (g) H+D mixture is called

CaCO_(3)(g) overset(Delta)rarr A (s)+B(g) , A(s) +D(s) rarr E(s)+F(g) H(s)+H_(2)O (steam) rarr CaCO_(3)+X (g) In the above reactins, 'F' is:

CaCO_(3) overset (Heat) (rarr) CaO + CO_(2) is known as

The atomic mass of Ca is 40 and the molecular mass of CaCO_(3) is 100 . What is the percentage of Ca in CaCO_(3) ?