Language of chemistry class 8

The symbol for carbon is

• C

• Ca

• none

the short hand representation of element is

• symbol

• atomic no.

• none

The valency of hydrogen is

• 1

• 2

• 3

Elements with variable valencies

• Iron

• Copper

• both

the formula for copper oxide is

• CuO

• CO

• none

The valency of chlorine in Calcium chloride is

• 1

• 2

• 3

The symbol for oxygen is

• O

• K

• N

Variable valency

• Iron

• calcium

• none

Monovalent is

• sodium

• potassium

• both

The molecular formula of Magnesium chloride is

• MgCl₂

• MgO

• none