Question : Water gas is the combination of:

Option 1: CO and H₂

Option 2: CO₂ and H₂

Option 3: CO and H₂O

Option 4: CO₂ and CO

Question : Supersonic jets cause thinning of which layer?

Option 1: O₂ layer

Option 2: O₃ layer

Option 3: CO₂ layer

Option 4: SO₂ layer

Question : Which of the following pair of compound name – formulas is correct?
I. Calcium oxide – CaO
II. Aluminium oxide – Al₂O₃

Option 1: Only I

Option 2: Both I and II

Option 3: Neither I nor II

Option 4: Only II

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

Option 1: Ba₂O₂

Option 2: BaSO₄

Option 3: BaO

Option 4: BaO₂

Question : In which of the following ions, the colour is not due to d-d transition?

Option 1: [Ti(H₂O)₆]⁺³

Option 2: CoF₆³⁻

Option 3: MnO₄⁻

Option 4: [Cu(NH₃)₄]²⁺