A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is :
(Given atomic mass of A = 64; B = 40; C = 32u)
1. ABC3
2. AB2C2
3. ABC4
4. A2BC2
Subtopic: Â Empirical & Molecular Formula |
Â 77%
From NCERT
NEET - 2024
Hints

4.74 g of an inorganic compound contains 0.39g of K, 0.27 g Al, 1.92 g of $$\mathrm{SO_4}$$ radicals and 2.16 g of water. If molar mass of the compound is $$948 \mathrm{~g} \mathrm{~mol}^{-1},$$ the molecular formula of the inorganic compound is:
 1 $$\mathrm{KAl}\left(\mathrm{SO}_4\right)_2 \cdot 12 \mathrm{H}_2 \mathrm{O}$$ 2 $$\mathrm{K}_2 \mathrm{Al}_2\left(\mathrm{SO}_4\right)_6 \cdot 12 \mathrm{H}_2 \mathrm{O}$$ 3 $$\mathrm{K}_2 \mathrm{SO}_4 \cdot \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot24 \mathrm{H}_2 \mathrm{O}$$ 4 $$\mathrm{K}_2 \mathrm{SO}_6 \cdot \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot12 \mathrm{H}_2 \mathrm{O}$$
Subtopic: Â Empirical & Molecular Formula |
Â 56%
From NCERT
NEET - 2024
Hints

Molar mass of a compound $$\text{(X)}$$ whose $$2.6 \mathrm{~mol}$$ weighs $$312 \mathrm{~g}$$ is:

1. $$312 \mathrm{~g} \mathrm{~mol}^{-1}$$
2. $$120 \mathrm{~g} \mathrm{~mol}^{-1}$$
3. $$60 \mathrm{~g} \mathrm{~mol}^{-1}$$
4. $$811.2 \mathrm{~g} \mathrm{~mol}^{-1}$$
Subtopic: Â Empirical & Molecular Formula |
Â 84%
From NCERT
NEET - 2024
Hints

An organic compound contains 80 % (by wt.) carbon and the remaining percentage of hydrogen. The empirical formula of this compound is:
[Atomic wt. of C is 12, H is 1]

 1 CH3 2 CH4 3 CH 4 CH2
Subtopic: Â Empirical & Molecular Formula |
Â 72%
From NCERT
NEET - 2021
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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:

 1 C3H13N3 2 CH2N 3 CH4N 4 CH6N
Subtopic: Â Empirical & Molecular Formula |
Â 72%
From NCERT
AIPMT - 2002
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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

Subtopic: Â Empirical & Molecular Formula |
Â 82%
From NCERT
AIPMT - 1999
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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. $C{H}_{3}N$

Subtopic: Â Empirical & Molecular Formula |
Â 76%
From NCERT
AIPMT - 1998
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch