Question : The chemical formula of gypsum is ______.

Option 1: CaSO₄.2H₂O

Option 2: CaSO₄.H₂O

Option 3: CaSO₄

Option 4: CaSO₄.(1/2)H₂O

Question : The chemical formula of borax is

Option 1: Na₂B₅ O₇ .10H₂O

Option 2: Na₂B₄O_7.10H₂O

Option 3: Na₂B₄O₇.5H₂O

Option 4: Na₂B₄O₇.12H₂O

Question : Identify the chemical formula of Ammonium Hydroxide.

Option 1: NH₄OH

Option 2: NH₄O₂

Option 3: NH₃O

Option 4: NH₂OH

Question : Which of the following is known as ‘Plaster of Paris’?

Option 1: 2CaSO₄. 2H₂O

Option 2: 2MgSO₄.H₂O

Option 3: 2MgSO₄.7H₂O

Option 4: 2CaSO₄.H₂O

Question : The chemical formula of washing soda is ______.

Option 1: Na₂CO₃.10H₂O

Option 2: Na₂SO₄

Option 3: NaOH

Option 4: NaHCO₃