What is the chemical symbol of calcium?
Ca
Cu
C
Kr
Which is the variable valency of Iron
1,2
2,3
1,3
2,4
Whose method about symbol system is considered as the basic of modern system of chemical symbols and formulae?
Dalton
Avogadro
Johann Berzelius
Al chemists
Variable valency of gold is
3,5
Empirical formula of Hydrogen peroxide .
CH
C6H6
H2O2
OH
Valency of Mg in Magnesium chloride
2+
5
2-
3+
Which element represented by symbol " K "
Copper
Krypton
Sodium
Potassium
Formula of cupric oxide
Cu2O
CuO
FeO
Fe2O3
Example for cation
Ammonium
Acetate
Sulphate
Fluoride
Example for monovalent electro positive
Barium
Aluminium
Zinc