The mole fraction of the solute in one molal aqueous solution is:

1. 0.027

2. 0.036

3. 0.018

4. 0.009

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminum metal from bauxite by the Hall process is:

1. 90 kg

2. 540 kg

3. 180 kg

4. 270 kg

(Atomic mass : Al = 27)

How many moles of KMnO₄ are reduced by 1 mole of KI in an alkaline medium?

1. One

2. Two

3. Five

4. One-fifth

How many significant figures are present in the following numbers?

1. 3, 3, 3
2. 3, 4, 3
3. 3, 2, 3
4. 3, 4, 4

A hemoglobin molecule has a molecular weight of 67,200g/mol and contains 0.33% iron (Fe) by weight. Calculate the total number of iron atoms present in a single molecule of hemoglobin:

$4N{H}_3$ $+$ $5O_2$ $\to$ $6H_{2}O$ $+$ $4NO$

When 1 mole of ammonia (NH₃) reacts with 1 mole of oxygen (O₂), which of the following outcomes occurs regarding the consumption of the reactants?

The mole ratio of H₂ and O₂ gas is 8:1. The ratio of their weight will be:

A compound is composed of carbon, hydrogen, and oxygen. The percentage composition by mass is 40% carbon and 6.67% hydrogen, with the remaining percentage being oxygen. Determine the empirical formula of the compound:

1. $C{H}_{2}O$

2. $C{H}_{4}O$

3. $C{H}_4{O}_2$

4. $C{H}_{\mathrm{}}O$

The maximum number of molecules is present in:

Which of the following options incorrectly describes the possible range of values for the mole fraction (x) of a component in a mixture?

1. x < 1
2. – 2 ≤ x ≤ 2
3. 0 ≤ x ≤ 1
4. x is always non-negative