NEET Chemistry MCQ: NCERT Empirical & Molecular Formula | NEET.Guide Questions

A compound contains 40% carbon, 6.67% hydrogen, and 53.33% oxygen. Its empirical formula is:

A

CH2O

B

C2H4O2

C

CHO

D

C2H4O

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :Empirical Formula, Percentage Composition

Related Questions

The empirical formula of naphthalene is:

A

${\rm{C}}{{\rm{H}}_2}$

B

${{\rm{C}}_5}{{\rm{H}}_4}$

C

${{\rm{C}}_2}{\rm{H}}$

D

${{\rm{C}}_n}{{\rm{H}}_{2n}}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :2 mins

🔄Ncert Concepts :empirical formula, molecular formula, ratio of atoms

The empirical formula of glucose is CH $_2$ O. If its molecular weight is 180, what is the molecular formula of glucose?

A

C $_3$ H $_6$ O $_3$

B

C $_4$ H $_8$ O $_4$

C

C $_5$ H $_{10}$ O $_5$

D

C $_6$ H $_{12}$ O $_6$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :Empirical Formula, Molecular Formula, Molecular Weight

A Carbon compound contains 12.8 % Carbon, 2.1 % Hydrogen and 85.1 % of Bromine. The molecular weight of the compound is 187.9. Its molecular formula is (at. Wt. of Br = 80)

A

$C{H_3}\,\,Br$

B

$C{H_2}\,\,B{r_2}$

C

${C_2}{H_4}\,\,B{r_2}$

D

${C_2}{H_3}\,\,B{r_3}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :3 mins

🔄Ncert Concepts :Empirical Formula, Molecular Formula, Percentage Composition, Atomic Weight

An oxide of metal M contains 70% of the metal (atomic mass = 56u) and 30% oxygen (atomic mass = 16u). Determine the empirical formula of the metal oxide.

A

MO

B

M2O3

C

MO2

D

M3O2

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

PYQ YEAR: 2024

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Stoichiometry, Empirical Formula

An organic compound contains 40% carbon, 6.67% hydrogen, and 53.33% oxygen. Its vapour density is 30. What is its molecular formula?

A

CH2O

B

C2H4O2

C

C3H6O3

D

CH4O

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Empirical Formula, Molecular Formula, Percentage Composition, Vapour Density

The formula of a compound which gives simple whole number atomic ratio in one molecule of a compound is called:

A

Structure formula

B

Molecular formula

C

Empirical formula

D

Projection formula

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Remembering

🎯Difficulty :Medium

⚡ Time Required :1 mins

🔄Ncert Concepts :Empirical formula, Molecular formula, Chemical formulas

An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of compound is

A

C₃H₅O₂

B

C₆H₁₀O₄

C

C₅H₁₂O₃

D

C₄H₈O₆

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :3 mins

🔄Ncert Concepts :Percentage composition, Empirical formula, Molecular formula, Vapour density, Molecular weight

An organic compound contains 90% Carbon and 10% Hydrogen by mass. Its empirical formula is

A

${C_2}{H_4}$

B

${C_3}{H_6}$

C

${C_3}{H_8}$

D

${C_3}{H_4}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Easy

⚡ Time Required :2 mins

🔄Ncert Concepts :Empirical Formula, Percentage Composition, Mole Ratio

A hydrocarbon contains 85.7% carbon. Its molecular mass is 42. The molecular formula of the compound is:

A

C2H4

B

C3H6

C

C4H8

D

C2H6

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Empirical Formula, Molecular Formula, Percentage Composition

Which of the following pairs has the same empirical formula?

A

C2H6 and C4H12

B

CH3OH and CH3CH2OH

C

H2O and H2O2

D

N2O3 and NO

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Understanding

🎯Difficulty :Medium

⚡ Time Required :1 mins

🔄Ncert Concepts :Empirical Formula

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