Question : What is the correct formula for calcium hydroxide?

Option 1: CaOH

Option 2: Ca(OH)₄

Option 3: Ca(AlOH)₄

Option 4: Ca(OH)₂

Question : What is the name of the 1,3-isomer (or meta-isomer) of benzenediol with the chemical formula C₆H₄(OH)₂?

Option 1: m-Cresol

Option 2: Resorcinol

Option 3: Catechol

Option 4: Glycerol

Question : What is the chemical formula of "quartz"?

Option 1: SiO₃

Option 2: SiO₅

Option 3: SiO

Option 4: SiO₂

Question : Which of the following is the formula of barium peroxide?

Option 1: Ba₂O₂

Option 2: BaSO₄

Option 3: BaO

Option 4: BaO₂

Question : Supersonic jets cause thinning of which layer?

Option 1: O₂ layer

Option 2: O₃ layer

Option 3: CO₂ layer

Option 4: SO₂ layer