Chemistry · JEE

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

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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:

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