Assertion (A):	The number of molecules in 2 moles of NH3 is equal to the number of molecules in 4 moles of CH4.
Reason (R):	Both are chemically similar species.

 

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

Percentage of C, H & N in 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 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:

One mole of carbon atom weights 12 g, the number of atoms in it is equal to:
(Mass of carbon – 12 is $1.9926\times {10}^{-23}$ $g$)

1. $1.2\times {10}^{23}$

2. $6.022\times {10}^{22}$

3. $12\times {10}^{22}$

4. $6.022\times {10}^{23}$

Calculate the mass percentages of sodium (Na), sulfur (S), and oxygen (O), respectively, in sodium sulfate (Na₂SO₄).

1. 32.4%, 45.05% and 22.6%

2. 22.6%, 45.05% and 32.4%

3. 32.4%, 22.6% and 45.05%

4. 45.05%, 32.4% and 22.6%

In a reaction A + B₂ → AB_2, 
A will act as a limiting reagent if :

 
Choose the correct option:

If 10 volumes of H₂ gas react with 5 volumes of O₂ gas, the volumes of water vapor produced would be:

1. 9

2. 8

3. 10

4. 11

The molar mass of naturally occurring Argon isotopes is: