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 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 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

The volume of CO₂ obtained by the complete decomposition of 9.85 grams of BaCO3 is:

1. 2.24 lit.

2. 1.12 lit.

3. 0.84 lit.

4. 0.56 lit

1 M, 2.5 litre NaOH solution is mixed with another 0.5 M and 3 litre NaOH solution. The molarity of the resultant solution will be:

Which among the following has the maximum number of molecules?

1. 7 gm N₂

2. 2 gm H₂

3. 16 gm NO₂

4. 16 gm O₂

The percentages of C, H, and N in an organic compound are 40%, 13.3%, and 46.7% respectively.
The empirical formula of the compound is:

Find the molarity of liquid HCl if the density of liquid HCl is 1.17 g/cc.

Molecular mass of  (i) ${\mathrm{H}}_2\mathrm{O}$ (ii) ${\mathrm{CO}}_2$ (iii) ${\mathrm{CH}}_4$ are respectively:

1. 18u,16u ,44u

2. 18u,44 u,16u

3. 16u,18u,44u

4. 44u,16u,18u