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Worksheets

Basic concepts of chemistry

Total questions: 20

Worksheet time: 5mins

Name
Class
Date
1.

Calculate the molecular mass of acetone (CH3COCH3 )

a)

46 g mol-1

b)

64 g mol-1

c)

58 g mol-1

2.

------- is considered as standard for atomic mass.

a)

6C12

b)

7C12

c)

6C13

3.

1 mole = ?

a)

60.23 x 1023

b)

6.23 x 1023

c)

6.023 x 1023

4.

Volume occupied by 1 mole of any gaseous substance at 273 K and 1 bar pressure is ------

a)

22.71 litres

b)

22.4 litres

c)

24.5 litres

5.

Equivalent mass of a reducing agent = Molar mass of reducing agent / ?

a)

no.of electrons gained by 1 mole

b)

no.of electrons lost by 1 mole

6.

What is the molecular formula of Lactic acid ( Empirical formula CH2O ) if n=3,

a)

CH2O

b)

C4H6O6

c)

C3H6O3

7.

mass / molar mass = number of moles (n)

a)

true

b)

false

8.

n x mass(m) = molar mass

a)

true

b)

false

9.

nx molar mass = mass(m)

a)

true

b)

false

10.

volume / 22.4 litres = n (no of moles)

a)

true

b)

false

11.

n x 22.4 litres = volume

a)

true

b)

false

12.

calculate X from the following expression

3 moles of hydrogen produces 2 moles of ammonia,

then how much of

X moles of hydrogen will produce 10 moles of ammonia

a)

3/5 moles of hydrogen

b)

10 moles of hydrogen

c)

15 moles of hydrogen

13.

Oxidation is -----

a)

gain of electrons

b)

loss of electrons

14.

Reduction is -----

a)

gain of electrons

b)

loss of electrons

15.

Reduction is -----

a)

addition of oxygen and removal of hydrogen

b)

addition of hydrogen and removal of oxygen

16.

Oxidation is -----

a)

addition of oxygen and removal of hydrogen

b)

addition of hydrogen and removal of oxygen

17.

Oxidation no. of a free element is ----

a)

0

b)

1

c)

+1

18.

Oxidation no. of hydrogen is ----

a)

0

b)

+1

c)

-1

19.

Oxidation no. of Flourine is ----

a)

0

b)

+1

c)

-1

20.

Oxidation no. of alkaline earth metals is ----

a)

+1

b)

-1

c)

-2

d)

+2