Rearrange the following (I to IV) in the order of increasing masses and choose answer from (1), (2), (3) and (4) (Atomic mass : N=14, O=16 Cu = 63)

I. 1 molecule of oxygen

II. 1 atom of nitrogen

III. 1 x 10^-10g molecule-weight of oxygen

IV. 1 x 10^-10g atom-weight of copper

1. II < I < III < IV

2. IV < III < II < I

3. II < III < I < IV

4. III < IV < I < II

What is the ratio of the number of atoms in 2.2 g of CO₂ and in 1.7 g of NH₃?

How many moles of FeC₂O₄ are required to reduce one mole of KMnO₄ in acidic medium?

1. 3/5

2. 1/5

3. 5/3

4. 5

Which of the following pairs of gases contains the same number of molecules:-

(1) 16g of O₂ and 14g of N₂ 

(2) 8g of O₂ and 22g of CO₂ 

(3) 28g of N₂ and 22g of CO₂ 

(4) 32g of O₂ and 32g of N₂ 

Calculate the number of ions present in 2L of a solution of 1.6 M K₄[Fe(CN)₆]:

The mass of CO₂ that shall be obtained by heating 10 kg of 80 % pure limestone (CaCO₃) is:

1. 4.4 kg

2. 6.6 kg

3. 3.52 kg

4. 8.8 kg

How many protons are present in 1.8g of ${{\mathrm{NH}}_4}^{+}$ :-

1. N_A

2. 1.2 N_A

3. 1.1 N_A

4. 11 N_A

When 1L of CO₂ is heated with graphite,the volume of the gases collected is 1.8L. What will be the number of moles of CO produced at STP?

1. 0.0357

2. 0.0714

3. 0.0803

4. 14

On reduction with CO, 200 kg of iron ore (Fe₂O₃) containing 20% impurities gives iron. The amount of iron produced will be-

1. 84 kg

2. 200 kg

3. 56 kg

4. 112 kg

At STP the moles of oxygen atoms in 2.8 L of CO₂ gas is:-

1. 0.125

2. 0.25

3. 0.5

4. 1