Free Printable Mole concept

1.

How much calcium is present in the amount of $Ca\left(NO_3\right)_2$ that contains 20 g of nitrogen

a)

38.0 g Ca

b)

48.5 g Ca

c)

28.6 g Ca

d)

32.4 g Ca

2.

How much phosphorous is contained in 5 g of the compound $CaCO_3.3Ca_3(PO_4)_2$ ? (Ca = 40.08)

a)

0.9 g

b)

1.4 g

c)

1.9 g

d)

2.4 g

3.

Calculate the molecular mass of $(NH_4)_2SO_4.FeSO_4.6H_2O$

a)

362

b)

372

c)

382

d)

392

4.

The number of moles of Ca is 5g of sample $CaCO_3$ is

a)

0.125

b)

0.25

c)

0.05

d)

1

5.

Mass of 4 moles of Al atom is

a)

108 u

b)

108 g

c)

both A and B

d)

108

6.

What will be the volume of 1 gram Helium at NTP?

a)

6.5 litre

b)

7.5 litre

c)

5.6 litre

d)

4.6 litre

7.

The number of molecules in 100 ml each of $O_2,NH_3\ and\ CO_2$ at STP are

a)

$NH_3>O_2>CO_2$

b)

$NH_3<CO_2<O_2$

c)

$NH_3<O_2<CO_2$

d)

The same

8.

What weight of $CaCO_3$ (M.W. = 100) shall be neutralized by 100 ml of 0.1 M HCl?

a)

0.25

b)

0.5

c)

1

d)

0.75

9.

It has been found by experiments that if 100 grams of calcium carbonate are decomposed completely the amount of calcium oxide and carbon dioxide formed are

a)

56 gms $CaO$ , 44 gms $CO_2$

b)

55 gms $CaO$ , 45 gms $CO_2$

c)

44 gms $CaO$ , 56 gms $CO_2$

d)

45 gms $CaO$ , 55 gms $CO_2$

10.

The correct decreasing order of masses is:

a)

$3.012\times10^{24}$ molecules of water > 2.5 moles of water > 0.25 gm of water

b)

2.5 moles of water > 2.5 gm of water > $3.012\times10^{24}$ molecules of water

c)

25 gm of water > 2.5 moles of water > $3.012\times10^{24}$ molecules of water

d)

None of the above

11.

One atomic mass unit is defined as exactly

a)

one-sixth the mass of an atom of C-12

b)

one-twelfth the mass of an atom of C-12

c)

six times the mass of an atom of C-12

d)

twelve times the mass of an atom of C-12

12.

Atoms usually exist in the form of

a)

molecules

b)

ion

c)

both of them

d)

none

13.

The atomicity of noble gases is

a)

0

b)

1

c)

2

d)

8

14.

Moles of He constitute by $9.033\times10^{24}$ atoms of $He$ is

a)

5

b)

10

c)

15

d)

7.5

15.

Mass of single atom of X is $2.65\times10^{-23}$ g . X should be

a)

Carbon

b)

Nitrogen

c)

Oxygen

d)

Hydrogen

Mole concept

Total questions: 15

Worksheet time: 23mins

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