Percentage of C, H & N of a compound is given as follows:
C=40%, H=13.33%, N=46.67%
The empirical formula of the compound will be:

1. $C{H}_{2}N$

2. $C_2{H}_{4}N$

3. $C{H}_{4}N$

4. $C{H}_{3}N$

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)

The number of moles of $KMn{O}_4$ reduced by one mole of KI in an alkaline medium is:

1. One

2. Two

3. Five

4. One fifth

The number of significant figures in the following numbers is:
 

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

0.33%  of iron (by weight) is present in hemoglobin (Molecular wt = 67200).
The number of iron atom(s) in one molecule will be:

1.  1
2.  2
3.  3
4.  4

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

When one mole ammonia and one mole oxygen are taken:
1.  Oxygen is completely consumed
2.  Ammonia is completely consumed
3.  Both (1) and (2) are correct
4.  None of the above options is correct

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

1. 1 : 1
2. 2 : 1
3. 4 : 1
4. 1 : 2

A compound contains C, H, and O. If C = 40% and H = 6.67% and rest is oxygen, then the empirical formula of the compound will be:

1. $C{H}_{2}O$

2. $C{H}_{4}O$

3. $C{H}_4{O}_2$

4. CHO

The maximum number of molecules is present in: