The number of moles of KMnO₄ reduced by one mole of KI in alkaline medium is 

(a) one fifth 

(b) five

(c) one

(d) two

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?

(a) 7L 

(b) 6L

(c) 5L

(d) 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)

(a) Mg, 0.16g

(b) O₂, 0.16g

(c) Mg, 0.44g

(d) O₂, 0.28g

Number of moles of Mn${\mathrm{O}}_4^{-}$ required to oxidise one mole of ferrous oxalate completely in acidic medium will be 

(a) 0.6 mole

(b) 0.4 mole

(c) 7.5 moles

(d) 0.2 mole

Assuming fully decomposed, the volume of CO₂ released at STP on heating 9.85g of BaCO₃ [at. mass of Ba = 137] will be

(a) 1.12L

(b) 0.84L

(c) 2.24L

(d) 4.96L

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

(a) 1.0 mole of H₂O is produced 

(b) 1.0 mole of NO will be produced

(c) all the oxygen will be consumed

(d) all the ammonia will be consumed

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

(a) one mole of H₂ 

(b) half mole of H₂

(c) one mole of O₂

(d) none of these

A sample of pure Cu (3.18g ) heated in a stream of oxygen for some time gains in mass with the formation of black oxide of copper (CuO). The final mas is 3.92 g. What per cent  of copper remains unoxidised?

1.$\approx$6.5 

2.$\approx$6.9

3. $\approx$7.6

4. $\approx$7.9

Versene, a chelating agent having chemical formula C₂H₄N₂(C₂H₂O₂Na)₄. If each mole of this compound could bind 1 mole of Ca²⁺, then the rating of pure versene expressed as mg of CaCO₃ bound per g of chelating agent is:

(a) 100 mg

(b) 163 mg

(c) 200 mg

(d) 263 mg