Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 25

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IMPORTANT

Earn 100

Mole fraction of $A$ in $H_{2} O$ is $0.2$ . The molarity of $A$ in $H_{2} O$ is:

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Important Questions on Mole Concept - 1

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 26

What is the molarity of

H_{2} {SO}_{4}

solution that has a density of

1.84 g / cc

and contains

98 %

by mass of

H_{2} {SO}_{4}

?

(

Given atomic mass of

S = 32)

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 27

The molarity of the solution containing

2.8 %

(mass / volume) solution of

KOH

is : (Given atomic mass of

K = 39

) is :

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 28

Four

1 - 1

litre flasks are separately filled with the gases

H_{2}, He, O_{2}

and

O_{3}

at the same temperature and pressure. The ratio of total number of atoms of these gases present in different flask would be:

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 29

Which of the following expressions is correct

(n =

number of moles of the gas,

N_{A} =

Avogadro constant,

m =

mass of

1

molecule of the gas,

N =

number of molecules of the gas

)

?

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 30

The volume of

1 mol

of a gas at standard temperature and pressure is:

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 31

2

moles of nitrogen atoms at

NTP

occupies a volume of:

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 32

Under the same conditions, two gases have the same number of molecules. They must

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 33

3 g

of a hydrocarbon on combustion in excess of oxygen produces

8.8 g

of

{CO}_{2}

and

5.4 g

of

H_{2} O

. The data illustrates the law of :