Question

1.Parminder said to Sukhwinder that there are two important elements present in molecule of water. Name the elements present in water
a. Hydrogen and Oxygen

b. Hydrogen and Chlorine

c. Hydrogen and Sodium

d. Hydrogen and Nitrogen​

Answer 1

Answer:

( b ) hydrogen and oxygen

Explanation:

as it's formula is H2O

Answer 2

Answer:

Explanation:

Compound  Chemical Formula Elements present  

Quick lime CaO Calcium, Oxygen

Hydrogen bromide  HBr Hydrogen, Bromine

Baking powder NaHCO  

3

​  

 Sodium, Hydrogen, Carbon, Oxygen  

Potassium sulphate K  

2

​  

SO  

4

​  

  Potassium, Sulphur, Oxyge