Empirical & Molecular Formula Recommended PYQs (STRICTLY NCERT Based) Some Basic Concepts Of Chemistry Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

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

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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.	$\mathrm{K}_2 \mathrm{SO}_6 \cdot \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot12 \mathrm{H}_2 \mathrm{O}$

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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. $811.2 \mathrm{~g} \mathrm{~mol}^{-1}$

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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

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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

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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

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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. $C H_{3} N$

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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.	\(\mathrm{K}_2 \mathrm{SO}_6 \cdot \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot12 \mathrm{H}_2 \mathrm{O}\)

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