February 25, 2026

Mole Concept and stoichiometry-MCQ

All About Chemistry01 mins
Mole Concept and stoichiometry

The question paper consists of 10 Question. 10 Marks and will be of 30 mins. After completing the exam click the FINISH option.

 
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#1. An organic compound contains 12.67% carbon, 2.13% hydrogen and 85.11% of Br.[C=12,H=1,Br=80]. If the vapour density of the compound is 94. Calculate its molecular formula.

#2. An organic compound contains 14.4% carbon, 1.2% hydrogen and 84.5% chlorine.[C=12, H=1, Cl=35.5] If the molar mass of the compound is 168. Calculate its molecular formula.

#3. The % of C in C2H5N. [C=12,H=1, N=14]

#4. A hydrocarbon contains 80% Carbon, 20% Hydrogen. [C=12, H=1]. If the vapour density of the compound is 15. Calculate its molecular formula.

#5. In inorganic compound contains 47.9% K, Be=5.5% and 46.6% F.[K=39,Be=9,F=19] Calculate its molecular formula if its molecular weight is 163.

#6. A compound contains 4.8% carbon, 95.2% bromine.[C=12, Br=80] If its vapour density is 252. Calculate its molecular formula.

#7. An inorganic compound contains 16.8% Na, 4.2% carbon, 72.73% oxygen and 6.99% hydrogen.[Na=23,C=12,O=16,H=1] If the molecular weight of the compound is 284. Calculate its molecular formula.

#8. A binary compound contains 12.5% hydrogen and the rest nitrogen.[H=1, N=14] If the molar mass of the compound is 32. Calculate its molecular formula.

#9. A compound contains 40% Carbon, 6.7% Hydrogen and 53.3% Oxygen.[C=12,H=1,O=16] If the vapour density of the compound is 90. Calculate its molecular formula.

#10. Anhydrous dibasic acid has 2.25% hydrogen, 26.7% carbon and 71.15% oxygen.[C=12,H=1,O=16] Calculate its molecular formula if the vapour density of the compound is 45.

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