A mixture containing 6.4 g of sulfur dioxide and 3.2 g of oxygen undergoes the reaction 2SO₂ + O₂ → 2SO₃, assuming complete reaction, calculate the mass of sulfur trioxide produced:

1. 32 g
2. 16 g
3. 8 g
4. 4 g

The molality of a 20% (by mass) CaCO₃ solution is : 
(Given: Density of solution is 1.2 gm/ml)

1 gm butane (C₄H₁₀) is burnt with excess of O₂ to form CO₂. What mass of CO₂ is produced?

1. 1gm

2. 2gm

3. 3gm

4. 4gm

If 0.5 moles of BaCl₂ is reacted with 0.2 moles of Na₃PO₄ then the maximum moles of Ba₃(PO₄)₂ formed is:

2 gm Iron pyrite (FeS₂) is burnt with O₂ to form Fe₂O₃ and SO₂. The mass of SO₂ produced is (Fe=56, S=32, O=16)

1. 2 gm

2. 2.13 gm

3. 4 gm

4. 4.26 gm

What is the correct ascending order of masses for the following (I to IV)?
(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
 

Codes
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]: