Chemistry MCQ Set 4

Question : Epsom is an ore of

1. Calcium
2. Magnesium
3. Zinc
4. Strontium

Question : Marble mainly contains

1. Calcium
2. Barium
3. Aluminum
4. Beryllium

Question : Formula of washing soda is

1. Na₂SO₃
2. Na₂CO₃H₂O
3. Na₂CO₃5H₂O
4. Na₂CO₃10H₂O

Question : The color of KMnO₄ is

1. Blue
2. Yellow
3. Dark purple
4. Green

Question : Corrosion of a metal produces

1. Chloride
2. Sulphate
3. Oxide
4. Nitrite

Question : We use tetracthyl lead Pb(C₂H5)₄ in gasoline (motor fuel) to

1. Reduce the consumption of fuel.
2. Reduce the price of fuel.
3. Reduce the octane number.
4. Reduce the knocking of the fuel.