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Worksheets

basic concepts of chemistry

Total questions: 50

Worksheet time: 29mins

Name
Class
Date
1.

Short hand representation for the atom of a specific element

a)

element

b)

atom

c)

symbol

2.

Symbol of copper is

a)

Co

b)

Cu

c)

Ca

3.

The valency of Chlorine in AlCl3 is

a)

1

b)

3

c)

2

4.

Sulphur shows valencies

a)

2

b)

4

c)

both

5.

The molecular formula for Ammonium carbonate is

a)

(NH4 )2CO3

b)

(NH4 )CO3

c)

(NH4 )2CO

6.

Name the elements present in Ammonia

a)

nitrogen

b)

hydrogen

c)

both nitrogen and hydrogen

7.

Most suitable element and most widely accepted standard unit for the measurement of atomic mass

a)

Oxygen

b)

Carbon

c)

Nitrogen

8.

The molecular formula for Nitric acid

a)

HNO3

b)

HNO2

c)

HNO

9.

Molecular formula for the oxide of calcium is

a)

CaO

b)

Ca2O

c)

none

10.

The symbol and valency of ammonium is

a)

NH4 , valency is 1

b)

NH3, valency is 1

c)

NH3 , valency is 2

11.

What is the name of 13th element

(a)  

12.

Is Zn²+ a monovalent

a)

True

b)

False

c)

Don't know

d)

Can't said anything

e)

Not studied

13.

Choose the bivalent

a)

Mg²+

b)

D²+

c)

Cu²+

d)

All of the above

14.

Atomic mass of neon

a)

20.18

b)

10.81

c)

14.4

d)

All are wrong

15.

Atomic mass of carbon

a)

12

b)

20.14

c)

3.3

d)

20.22

16.

Formula of baking soda

a)

NaHCO3

b)

Nacl

c)

H2SO4

17.

In correct position tell first ten elements

a)

H,He,Li,Be,B,C,N,O,F,Ne

b)

H,He,Li,Be,B,C,N,O,F,Na

c)

H,He,Li,B,Be,C,N,O,F,Ne

d)

All are correct

18.

Greek name of Antimony

(a)  

19.

Latin name of Aluminium

(a)  

20.

Latin name of Aluminium

(a)  

21.

Symbol of lead

(a)  

22.

The formula for Silver [I] chloride is:

a)

AgCl

b)

SiCl

c)

AgCl2

d)

AgCl2

23.

State the possible valencies for Iron:

a)

1 and 2

b)

2 and 3

c)

4 and 2

d)

3 and 5

24.

State the possible valencies for Iron:

a)

1 and 2

b)

2 and 3

c)

4 and 2

d)

3 and 5

25.

The term used for substances which are formed as a result of chemical reaction

a)

Reactants

b)

Catalyst

c)

Products

d)

Precipitate

26.

The chemical name for Nitric oxide (NO) is:

a)

Nitrogen peroxide

b)

Nitrogen Monoxide

c)

Dinitrogen oxide

d)

None of the above

27.

With reference to Atomic structure of an element given, select all the correct options from below:

a)

It is a non- metal

b)

it is solid in nature

c)

Its valency is 2-

d)

Its atomic number is 9

28.

Which out of these is a rare gas?

a)

Hydrogen

b)

Boron

c)

Silicon

d)

Argon

29.

Choose the elements whose valency is 2+

a)

Oxygen

b)

Magnesium

c)

Sodium

d)

Beryllium

30.

Which out of these will form an anion?

a)

Ammonium

b)

Chlorine

c)

Nickel

d)

Iron

31.

What is the valency for Zincate radical?

a)

3+

b)

4+

c)

2+

d)

1-

32.

The chemical formula for Magnesium Nitride is:

a)

MgNO4

b)

(Mg)2NO3

c)

MnN2

d)

Mg3N2

33.

The valency of copper in CuO is:

a)

3+

b)

2+

c)

1+

d)

none of the above

34.

Lead Sulphate+Ammonium Hydroxide → Ammonium sulphate +Lead hydroxide.

Choose the correct Chemical equation for the above mentioned word equation.

a)

PbSo4 + Nh4OH → NH4SO4 + Pb(OH)2

b)

PbSO4 + NH4OH → NH4(SO4)2 + Pb(OH)2

c)

PBSO4 + NH4OH → NH4SO4 + PB(OH)2

d)

PbSO4 + NH4OH → (NH4)2SO4 + Pb(OH)2

35.

What is the valency of lead ?

a)

1,2

b)

5,7

c)

2,4

d)

1,4

36.

True or False: Law of conservation of energy states that matter can neither be created nor destroyed

a)

True

b)

False

37.

The valency of Chlorine in AlCl3 is

a)

1

b)

3

c)

2

38.

The molecular formula for Ammonium carbonate is

a)

(NH4 )2CO3

b)

(NH4 )CO3

c)

(NH4 )2CO

39.

What is the name of 13th element

(a)  

40.

How many valence electrons are in an atom of Ar?

a)

2

b)

8

c)

4

d)

1

41.
valency of chloride ion is
a)
0
b)
+1
c)
-1
d)
2
42.

What is the molecular formula of acetic acid

(a)  

43.

sugar formula ?

a)

K2CO3

b)

Na3PO4

c)

C12H22O11

44.
What is the mass number defined as?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
45.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
46.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

47.

Which subatomic particle has a negative charge in the atom?

a)

proton

b)

neutron

c)

electron

d)

quark

48.
nitrate ion contains 
a)
nitrogen and oxygen
b)
Nitrogen only
c)
Nitrogen ,hydrogen and oxygen
d)
Sodium and nitrogen
49.

The representation for nitrate ion is ——-

(a)  

50.

The representation for sulphate ion is

a)

SO42-

b)

SO3-

c)

SU2-

d)

All

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