Feb 11, 2019

GK science questions for ARMY CLERK Exam 2019

            

common gk science questions 2019, latest gk questions for army clerk exam 2019
Gk Science questions 2019


                Metals and Their Valency

* The valency of all metals is positive +

METAL
VALENCY
Alumunium
3
Antimony
3
Barium
2
Bismuth
3
Cadmium
2
Calcium
2
Chromium
2,3,6
Cobalt
2
Copper
2
Gold
3
Iron
2,3
Lead
2
Magnesium
2
Manganese
2,3
Mercury
2
Nickel
2,3
Platinum
4
Potassium
1
Radium
2
Silver
1
Sodium
1
Strontium
2
Thorium
4
Tin
4
Tungsten
6
Uranium
6
Zinc
2



           Non-Metals and their Valency

* The valency of all non-metals is Negative -




NON-METAL
VALENCY
Arsenic
3,5
Boron
3
Bromine
5
Carbon
4
Chlorine
1
Fluorine
1
Hydrogen
1
Iodine
1
Nitrogen
3
Oxygen
2
Phosphorus
5
Sulphur
6