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

Which of the following is the molality of a 20% (by mass) \(\mathrm{CaCO_3}\)solution?
\((\text{Given: Density of the solution} = 1.2\ \text{g mL}^{-1})\)

If 0.5 mole of BaCl₂ reacts with 0.2 mole of Na₃PO₄, what is the maximum number of moles of Ba₃(PO₄)₂ that can be formed?

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

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

Calculate the mass of iron obtained when 200 kg of Fe₂O₃ ore containing 20%
impurities is completely reduced by CO.

1. 84 kg

2. 200 kg

3. 56 kg

4. 112 kg

Which of the following gases would have a mass of 4.4 g for a volume of 2.24 L at NTP?

How many gram-molecules of oxygen are present in 6.02 × 10²⁴ molecules of CO?

1. 10 g molecules

2. 5 g molecules

3. 1 g molecules

4. 0.5 g molecules

An organic compound has the following composition by mass: C = 40.687%, H = 5.085%, O = 54.228%. Given vapour density = 59, find its molecular formula.

1. C₄H₆O₄

2. C₄H₆O₂

3. C₄H₄O₂

4. None of the above

(Given - Atomic wt ,Ca = 40, C= 12, O=16)