What volume of  oxygen gas (O₂) measured at $0°\mathrm{C}$ and 1 atm, is needed to burn completely 1L of  propane gas (C₃H₈) measured under the same conditions?

1. 7L 

2. 6L

3. 5L

4. 10L

1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel. Which reactant is left in excess and how much?

(At. weight of Mg = 24, O=16)

1. Mg, 0.16g

2. O₂, 0.16g

3. Mg, 0.44g

4. O₂, 0.28g

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (at. mass of Al = 27)

1. 180 kg

2. 270 kg

3. 540 kg

4. 90 kg

In the reaction, 4NH₃(g)+ 5O₂(g) $\to$4NO(g) +6H₂O(l)

When 1 mole of ammonia and 1 mole of O₂ are made to react to completion, then

1. 1.0 mole of H₂O is produced 

2. 1.0 mole of NO will be produced

3. all the oxygen will be consumed

4. all the ammonia will be consumed

12 g of Mg (atomic mass=24) will react completely with an acid to give:

1. one mole of H₂ 

2. half mole of H₂

3. one mole of O₂

4. none of these