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

A nitrogen oxide contains 30.43% nitrogen by mass. Which of the following could be its molecular formula?

A

NO

B

N₂O

C

NO₂

D

N₂O₅

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :2 mins

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

Related Questions

A hydrocarbon contain , the vapour density of compound is 30, empirical formula of compound is

A

$C{H_3}$

B

${C_2}{H_6}$

C

${C_4}{H_{12}}$

D

${C_4}{H_8}$

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 :Vapour Density, Molecular Formula, Empirical Formula

An organic compound contains 78% (by wt.) carbon and the remaining percentage of hydrogen. What is the empirical formula of this compound? (Atomic wt. of C is 12, H is 1)

A

CH₄

B

C₂H₆

C

C₅H₁₇

D

C₆H₁₂

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

PYQ YEAR: 2021

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Stoichiometry, Empirical Formula

A hydrocarbon contains 82.76% carbon by mass. If 0.90 g of the hydrocarbon occupies a volume of 390 $cm^3$ at STP, what is its molecular formula?

A

$C_2H_5$

B

$C_3H_8$

C

$C_4H_{10}$

D

$C_5H_{12}$

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 :Empirical Formula, Molecular Formula, Stoichiometry, Molar Volume

A hydrated salt of magnesium sulfate, $MgSO_4 \cdot xH_2O$ , contains 51.2% water by mass. What is the value of 'x' in the formula?

A

5

B

6

C

7

D

8

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :2 mins

🔄Ncert Concepts :Hydrates, Empirical Formula, Percentage Composition

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

A compound has an empirical formula of CH and a molecular mass of 78 g/mol. What is its molecular formula?

A

C2H2

B

C4H4

C

C6H6

D

C8H8

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :1 mins

🔄Ncert Concepts :Empirical Formula, Molecular Formula

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

A compound has the molecular formula C $_2$ H $_4$ O $_2$ . What is its empirical formula?

A

C $_2$ H $_4$ O $_2$

B

CH $_2$ O

C

CHO

D

CH $_4$ O

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Understanding

🎯Difficulty :Easy

⚡ Time Required :1 mins

🔄Ncert Concepts :Empirical Formula, Molecular Formula

An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of C is 12, H is 1]

A

CH4

B

C2H6

C

C3H10

D

C2H4

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, mass percentage, mole concept

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

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