NCERT Question 5 - Chapter 3 Class 9 - Atoms And Molecules

Give the names of the elements present in the following

compounds.

(a) Quick lime

(b) Hydrogen bromide

(c) Baking powder

(d) Potassium sulphate.

Answer

(a) Quick lime

CaO (Calcium Oxide) is known as quick lime.

CaO has the following elements:

• Calcium (Ca)

• Oxygen (O)

(b) Hydrogen bromide

HBr (Hydrogen Bromide) has the following elements:

• Hydrogen (H)

• Bromine (Br)

(c) Baking powder

NaHCO 3 (Sodium Hydrogencarbonate) is known as baking powder

NaHCO 3 has the following elements:

• Sodium (Na)

• Hydrogen (H)

• Carbon (C)

• Oxygen (O)

(d) Potassium Sulphate

K 2 SO 4 (Potassium Sulphate)  has the following elements:

• Potassium (K)

• Sulphur (S)

• Oxygen (O)