Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 31

EASY

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IMPORTANT

Earn 100

A $10 g$ sample of a mixture of calcium chloride and sodium chloride is treated with ${Na}_{2} {CO}_{3}$ to precipitate calcium as calcium carbonate. This ${CaCO}_{3}$ is heated to convert all the calcium to $CaO$ and the final mass of $CaO$ is $0.56 g .$ Calculate the mass of $NaCl$ in the original mixture approximated to nearest integer.

Important Questions on Some Basic Concepts of Chemistry

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 34

Calculate the molarity of the following solutions :
(a)

40 g

of caustic soda is dissolved in

200 mL

of the solution.
(b)

53 g

of anhydrous sodium carbonate is dissolved in

100 mL

of solution.
(c)

3.65 g

of pure

HCl

gas is dissolved in

50 mL

of solution.

EASY

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 35

10 mL

of a mixture of

CO, {CH}_{4},

and

N_{2}

exploded with excess of oxygen gave a contraction of

6.5 mL .

There was a further contraction of

7 mL,

when the residual gas treated with

KOH .

What is the volume of the following in original mixture? (i)

CO,

(ii)

{CH}_{4},

(iii)

N_{2}

EASY

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 36

When

100 mL

of a

O_{2} - O_{3}

mixture was passed through turpentine, there was reduction of volume by

20 mL .

If

50 mL

of such a mixture is heated, what will be the increase in volume?

EASY

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 37

How many

g

of element are present in

35.125 g

atom of

Si

. (Given at. wt. of

Si = 28 .

)

EASY

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 38

If the no. of molecules in a drop of water weighing

0.07 g

are

x \times 10^{21}

then find

x

.

EASY

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 39

Calculate the mass of

{NaClO}_{3}

containing

18.06 \times 10^{23}

atom of

O

.

EASY

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 41

Calculate the number of moles in

5.75 g

of sodium. (Atomic mass of sodium

= 23 .)

EASY

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-3>Q 43

The density of liquid mercury is

13.6 g {cm}^{- 3} .

How many moles of mercury are there in

1

litre of the metal? (Atomic mass of

Hg = 200

)