Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 22

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11th CBSE

IMPORTANT

Earn 100

If $1 mL$ of water $(density = 1 g {mL}^{- 1})$ contains $20$ drops, then number of molecules in a drop of water is

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Important Questions on Some Basic Concepts of Chemistry

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 23

Which has the maximum number of molecules among the following?

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 24

The number of water molecules is maximum in

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 25

In which case is the number of molecules of water maximum

(density = 1 g {cm}^{3})

?

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 26

Which one of the following is the lightest?

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Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 27

50 mL 10 N H_{2} {SO}_{4}

,

25 mL 12 N HCl

and

40 mL 5 N {HNO}_{3}

were mixed together and the volume of the mixture was made

1000 mL

by adding water. The normality of the resultant solution will be:

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 28

A

0.1 M

basic solution is required from

Ca (OH)_{2}

which is

40

percent ionized. Analytical molarity of

Ca (OH)_{2}

should be

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Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 29

0.3 g

of an acid is neutralized by

40 {cm}^{3}

of

0.125 N

NaOH

. Equivalent mass of the acid is

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IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 30

25.3 g

of sodium carbonate,

({Na}_{2} {CO}_{3})

is dissolved in enough water to make

250 mL

of solution. If the sodium carbonate dissociates completely, molar concentration of sodium ions,

{Na}^{+}

and carbonates ions,

{CO}_{3}^{2 -}

are respectively (Molar mass of

{Na}_{2} {CO}_{3} = 106 g {mol}^{- 1}

).