Question : Aluminium salt commonly used to stop bleeding is:

Option 1: Aluminium nitrate

Option 2: Aluminium sulphate

Option 3: Aluminium chloride

Option 4: Potash alum

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 : Dry powder fire extinguishers contain:

Option 1: sand

Option 2: sand and sodium carbonate

Option 3: sand and potassium carbonate

Option 4: sand and sodium bicarbonate

Question : Nitrogen in water is commonly found in the form of:

Option 1: Nitrous oxide

Option 2: Nitrate

Option 3: Nitric oxide

Option 4: Nitrite

Question : The hardness of the water is commonly measured in terms of:

Option 1: calcium carbonate equivalents

Option 2: calcium sulphate equivalents

Option 3: magnesium carbonate equivalents

Option 4: magnesium sulphate equivalents