Chemistry · JEE

Mole concept, molar mass, percentage composition, empirical and molecular formulae Mock Test for JEE

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Syllabus context

Part of Some Basic Concepts in Chemistry in JEE Main Chemistry.

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Q1ChemistryUnit 1: Some Basic Concepts in Chemistry

What is molecular formula of oleum?

Q2ChemistryUnit 1: Some Basic Concepts in Chemistry

The volume of 0.5 moles of a gas at 273

\mathrm{K}

and

380 \mathrm{mm}

pressure is:

Q3ChemistryUnit 1: Some Basic Concepts in Chemistry

The number of significant figures in

N_{0}=6.022 \times 10^{23}

i.e., Avogadro's number, is :

Q4ChemistryUnit 1: Some Basic Concepts in Chemistry

380 \mathrm{mL}

of a gas at

27^{0} \mathrm{C}, 800 \mathrm{mm}

\mathrm{Hg}

weight

0.455 \mathrm{g} .

the mol.wt.of gas is:

Q5ChemistryUnit 1: Some Basic Concepts in Chemistry

Which of the following contains maximum number of atoms?

Q6ChemistryUnit 1: Some Basic Concepts in Chemistry

A metal M of atomic weight 54.94 g has a density of 7.42 g/cc. The apparent volume occupied by one atom of the metal will be:

Q7ChemistryUnit 1: Some Basic Concepts in Chemistry

If repeated measurements give values close to one another, the number is:

Q8ChemistryUnit 1: Some Basic Concepts in Chemistry

The number of moles of sodium oxide in 620 g of it is:

Q9ChemistryUnit 1: Some Basic Concepts in Chemistry

Percentage composition of fibroin and sericin in silk is

Q10ChemistryUnit 1: Some Basic Concepts in Chemistry

Calculate the

\%

composition of Carbon in

C O_{2} .

Molar mass is 44.01

Q11ChemistryUnit 1: Some Basic Concepts in Chemistry

Oil

A

is at

300^{\circ}

C whereas oil

B

is at

530^{\circ}

F. Which one is hotter?

Q12ChemistryUnit 1: Some Basic Concepts in Chemistry

Approximately what percent of the universe is believed to consist of hydrogen?

Q13ChemistryUnit 1: Some Basic Concepts in Chemistry

Mass of one molecule of glucose is(in

\operatorname{grams}

Q14ChemistryUnit 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

Q15ChemistryUnit 1: Some Basic Concepts in Chemistry

An organic compound has

C

and

H

percentage in the ratio 6: 1 by mass and

\mathrm{C}

and 0 percentage in the ratio 3: 4 by mass. The compound is:

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