Which of the following symbols of elements are incorrect? Give their correct symbols
Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III).
(a) Ammonia
(b) Carbon monoxide
(c) Hydrogen chloride
(d) Aluminium fluoride
(e) Magnesium sulphide
Ans. (a) NH3; ratio N : H = 14 : 3
(b) CO; ratio C : O = 3 : 4
(c) HCl; ratio H : Cl = 1 : 35.5 or 2 : 71
(d) AlF3; ratio Al : F = 9 : 19
(e) MgS; ratio Mg : S = 3 : 4
