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

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

Related Questions

If the empirical formula of a compound is CH and its molecular weight is 78, what is its molecular formula?

A

C $_2$ H $_2$

B

C $_4$ H $_4$

C

C $_6$ H $_6$

D

C $_8$ H $_8$

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 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

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

What is the empirical formula of a compound having 40% carbon, 6.66% hydrogen and 53.34% oxygen?

A

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

B

${{\rm{C}}_2}{{\rm{H}}_4}{\rm{O}}$

C

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

D

${\rm{CHO}}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :3 mins

🔄Ncert Concepts :empirical formula, mole concept, atomic mass

A hydrocarbon contains 82% carbon by weight. If the atomic weight of carbon is 12 and hydrogen is 1, what is its empirical formula?

A

CH4

B

C2H6

C

C3H8

D

C4H10

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

What is the empirical formula of a compound containing 80% carbon and 20% hydrogen?

A

CH

B

CH $_2$

C

CH $_3$

D

CH $_4$

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

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 having molecular mass 60 is found to contain C=20%, H=6.67% and N=46.67% while rest is oxygen. On heating it gives ${\rm{N}}{{\rm{H}}_3}$ along with a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound is

A

${\rm{C}}{{\rm{H}}_3}{\rm{C}}{{\rm{H}}_2}{\rm{CON}}{{\rm{H}}_2}$

B

${\left( {{\rm{N}}{{\rm{H}}_2}} \right)_2}{\rm{CO}}$

C

${\rm{C}}{{\rm{H}}_3}{\rm{CON}}{{\rm{H}}_2}$

D

${\rm{C}}{{\rm{H}}_3}{\rm{NCO}}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:Some Basic Concepts in Chemistry

🎯Topic:Emprirical Formula & Molecular Formula

🎓 Ncert Level:Analyzing

🎯Difficulty :Medium

⚡ Time Required :3 mins

🔄Ncert Concepts :Empirical formula, Molecular formula, Reactions of amides, Biuret test

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

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

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