Chemistry · JEE

Online Practice: Mole concept, molar mass, percentage composition, empirical and molecular formulae for JEE

7+ syllabus-aligned questions available

Quick answer

Goodmarks provides free online JEE practice for Mole concept, molar mass, percentage composition, empirical and molecular formulae with 7+ MCQs, instant answer checking, and full solutions. Sign up to unlock the complete question bank and topic-wise filters.

Sharpen your chemistry preparation with interactive online practice for Mole concept, molar mass, percentage composition, empirical and molecular formulae. Goodmarks offers 7+ JEE-style MCQs mapped to the official syllabus, each with detailed explanations so you learn from every attempt.

Free sample questions

Attempt 7 free MCQs for Mole concept, molar mass, percentage composition, empirical and molecular formulae. Unlock the full bank with Pro.

Unlock full bank

Q1ChemistryUnit 1: Some Basic Concepts in Chemistry

What is the density of wet air with

75 \%

relative humidity at 1 atm and

300 \mathrm{K}

? Given : vapour pressure of

H_{2} O

is 30 torr and average molar mass of air is

29 g / m o l

Q2ChemistryUnit 1: Some Basic Concepts in Chemistry

Calculate the volume occupied by 40 g. of a

C H_{4}

\mathrm{S.T.P}

if its

\mathrm{V} . \mathrm{D}

. is 8

Q3ChemistryUnit 1: Some Basic Concepts in Chemistry

1.00 \mathrm{g}

of a hydrated salt contains

0.2014 \mathrm{g}

of iron,

0.1153 \mathrm{g}

of sulphur

0.2301 \mathrm{g}

of oxygen and 0.4532 g of water of crystallisation. If its empirical formula

(\boldsymbol{F e}=\mathbf{5 6} ; \boldsymbol{S}=\mathbf{3 2} ; \mathbf{0}=\mathbf{1 6})

F e S O_{x} \cdot y H_{z} O,

then find the value of

x, y

and

z

Q4ChemistryUnit 1: Some Basic Concepts in Chemistry

The formula that gives the symbolic representation of the actual number of atoms of various elements present in one molecule of the compound, is called:

Q5ChemistryUnit 1: Some Basic Concepts in Chemistry

A compound of sodium does not give

C O_{2}

when heated but it gives

C O_{2}

when treated with dilute acids. A crystalline compound is found to have 37.1\% Na and 14.52\%

\boldsymbol{H}_{\mathbf{2}} \boldsymbol{O}

. Hence, the compound is :

Q6ChemistryUnit 1: Some Basic Concepts in Chemistry

The composition of a sample of Wustite is

F e_{0.93}

O. What is the percentage of iron present as

F e^{3+}

in total iron?

Q7ChemistryUnit 1: Some Basic Concepts in Chemistry

A solution is prepared by adding 2 g of substance

A

to 18 g of water. The mass percent of the solute is:

Want unlimited Mole concept, molar mass, percentage composition, empirical and molecular formulae practice?

Pro unlocks the full question bank, topic filters, and attempt history.

Get started free View Pro plans

Frequently asked questions

How do I practice Mole concept, molar mass, percentage composition, empirical and molecular formulae online for JEE?

Open this page, attempt the free sample MCQs, then sign up on Goodmarks to access the full Mole concept, molar mass, percentage composition, empirical and molecular formulae question bank with topic filters and detailed explanations.

How many Mole concept, molar mass, percentage composition, empirical and molecular formulae questions are available?

Goodmarks currently has 7+ JEE-aligned MCQs for Mole concept, molar mass, percentage composition, empirical and molecular formulae, with more added regularly.

Is this aligned with the JEE Main syllabus?

Yes. All Chemistry questions on Goodmarks are organised by official JEE Main units and subtopics, including Mole concept, molar mass, percentage composition, empirical and molecular formulae.

Do I get solutions after each question?

Every question includes the correct answer and a step-by-step explanation. Free users can practise a random mix; Pro unlocks full subject and topic filters.