Formula of cupric oxide
Cu2O
CuO
FeO
Fe2O3
Example for basic radical is
Magnesium
Bromide
Chloride
Silicate
Which is the variable valency of Iron
1,2
2,3
1,3
2,4
Example for anion ?
Barium
Aluminum
Arsenic
Carbonate
Which is a balanced chemical equation?
Pb (NO3)2 → PbO + 2NO2 + O2
K2Cr2O7+HCI → KCl + CrCl3 + H2O +Cl2O2
2KNO3 → 2KNO2 +O2
H2O + Cl2 → HCl + O2
Which of the following molecular formula denotes sodium carbonate?
CH3COOH
Na2CO3
K2CO3
Na2SiO3
Which element represented by symbol " K "
Copper
Krypton
Sodium
Potassium
Barium is _______ type of electro positive
Monovalent electro positive
Divalent electro positive
Trivalent electro positive
Tetravalent electro positive
What is the chemical symbol of calcium?
Ca
Cu
C
Kr
Whose method about symbol system is considered as the basic of modern system of chemical symbols and formulae?
Dalton
Avogadro
Johann Berzelius
Al chemists