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Language of Chemistry-IX

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

The short form abbreviation for the name of an element that represents one atom of an element is _____

a)

symbol

b)

formula

c)

equation

d)

valency

2.

The short form abbreviation for a compound that represents one molecule of a compound is _____

a)

symbol

b)

chemical formula

c)

equation

d)

valency

3.

The symbolic representation of a chemical equation having same mass of reactants and products is _____

a)

balanced chemical equation

b)

chemical formula

c)

chemical equation

d)

valency

4.

The number of electrons gained or shared by an atom of an element during a chemical change is _____

a)

balanced chemical equation

b)

chemical formula

c)

chemical equation

d)

valency

5.

Which all elements have variable valency?

(more than one option might be correct)

a)

iron

b)

copper

c)

lead

d)

tin

6.

2 H and H2 stands for ___ and ___ respectively of hydrogen

a)

2 atoms

b)

2 atoms and 2 molecules

c)

2 atoms and 1 molecule

d)

2 molecules

7.

The formula of phosphine and ammonia is

a)

PH3 and NH3

b)

PH3 and H2S

c)

H2S and NH3

d)

PH3 and NH4

8.

What is the formula of calcium nitride?

a)

Ca3N2

b)

(CH3COO)2Pb

c)

Mg3PO4

d)

Cr2(SO4)3

9.

What is the formula of lead acetate?

a)

Ca3N2

b)

(CH3COO)2Pb

c)

Mg3PO4

d)

Cr2(SO4)3

10.

What is the formula of magnesium phosphate?

a)

Mg3(PO4)2

b)

(CH3COO)2Pb

c)

Mg3PO4

d)

Cr2(SO4)3

11.

What is the formula of chromium sulphate?

a)

Ca3N2

b)

(CH3COO)2Pb

c)

Mg3PO4

d)

Cr2(SO4)3

12.

Na2ZnO2 is the formula of

a)

sodium zinc oxide

b)

sodium zinte

c)

sodium zincate

d)

zinc natrium ate

13.

NaClO3 is the formula of

a)

sodium hypochlorite

b)

sodium perchlorate

c)

sodium chlorite

d)

sodium chlorate

14.

A group of atoms having a charge is called ___ and it is of two types positive is called ____ and negative is ____

a)

radical ,acid radical, basic radical

b)

radical ,basic radical, acid radical

c)

ion, anion, cation

d)

atom, proton, electron

15.

Co and CO stands for ____ and ____ respectively.

a)

cobalt and carbon monoxide

b)

carbon monoxide and cobalt

c)

copper and cobalt

d)

carbon and cobalt

16.

The valency of nitrogen in NO2 is

a)

1

b)

2

c)

3

d)

4

17.

___ PbO + ____ NH3 -----> ____ Pb + ____ H2O + N2. Balance this eqn. Select the numbers in correct order as in question

a)

3, 2, 3, 3

b)

3, 1 , 2 , 2

c)

3,1, 3, 3

d)

2, 3, 2, 3

18.

___ P + ____ HNO3 -----> ____ NO2 + ____ H2O + H3PO4 . Balance this eqn. Select the numbers in correct order as in question

a)

1, 5, 5, 1

b)

1, 1 , 2 , 2

c)

1,1, 3, 3

d)

1, 5, 2, 3

19.

___ S + ____ HNO3 -----> ____ NO2 + ____ H2O + H2SO4 . Balance this eqn. Select the numbers in correct order as in question

a)

1, 6, 6, 2

b)

1, 6 , 2 , 2

c)

1,4, 3, 3

d)

1, 2, 2, 3

20.

___ NH3 + ___O2 -----> ____ NO + ____ H2O

Balance this eqn. Select the numbers in correct order as in question

a)

4, 5, 4, 6

b)

2, 5, 2, 6

c)

4, 5, 4, 4

d)

1, 2, 2, 3

21.

___ ZnS + ___O2 -----> ____ ZnO + ____ SO2

Balance this eqn. Select the numbers in correct order as in question

a)

4, 5, 4, 6

b)

2, 3, 2, 2

c)

4, 5, 4, 4

d)

2, 2, 2, 3

22.

It is the 1/12 th of the mass of one atom of Carbon-12 isotope.

a)

1 a.m. u

b)

1 g

c)

1 mole

d)

chemical amount

23.

Find the relative molecular mass of NH4NO2.

N-14 H-1 O-16

a)

64

b)

32

c)

60

d)

30

24.

Find the relative molecular mass of CuSO4.5H2O

Cu-64 H-1 O-16 S-32

a)

250

b)

249

c)

252

d)

240

25.

What is the percentage of nitrogen in NH2CONH2

N-14 C-12 O-16 H-1

a)

46.7%

b)

45%

c)

23.3%

d)

52.2%

26.

Find the percentage of water of crystallization in Na2CO3.10H2O

Na-23 C-12 O-16 H-1

a)

62%

b)

62.9%

c)

60%

d)

59.8%

27.

Find the percentage of oxygen in (NH4)2SO4

N-14 S-32 O-16 H-1

a)

48.5%

b)

62.9%

c)

60%

d)

59.8%

28.

The simplest formula of a compound which gives the simplest ratio of atoms of each element present in one molecule of a compound is called ___

a)

formula

b)

empirical formula

c)

molecular formula

d)

skeletal formula

29.

Write the empirical formula of H2O2

(a)  

30.

Write the empirical formula of C6H6

(a)  

31.

In water, oxygen to hydrogen mass ratio is

a)

1:8

b)

8:1

c)

1:1

d)

1:2

32.

The empirical formula of CH3COOH is

a)

CHO

b)

CH2O

c)

C2H4O2

d)

CHO2

33.

A chemical equation needs to be balanced due to law of conservation of ____

a)

energy

b)

chemicals

c)

mass

d)

momentum

34.

Find the molecular mass of CaCO3

Ca-40 C-12 O-16

a)

100

b)

100g

c)

100 a.m.u

d)

all of these

35.

The number of atoms present in one molecule of an element is called ____

a)

valency

b)

atomic number

c)

atomicity

d)

symbol

36.

Which is/are monoatomic.

(More than one option might be correct)

a)

Helium

b)

Krypton

c)

Xenon

d)

Argon

e)

Neon

37.

Which is/are diatomic.

(More than one option might be correct)

a)

oxygen

b)

chlorine

c)

hydrogen

d)

nitrogen

e)

ozone

38.

Which is tetra atomic?

a)

ozone

b)

Sulphur

c)

phosphorous

d)

tin

39.

H2SO3 is

a)

sulphuric acid

b)

sulphurous acid

40.

HNO2 is

a)

nitric acid

b)

nitrous acid

41.

Acid radicals are otherwise called as

a)

cations

b)

anions

42.

The formula of Tin (IV) oxide is

a)

SnO

b)

SnO2

c)

Sn2O

d)

Sn2O4

43.

Sulphur atomicity is

a)

3

b)

4

c)

6

d)

8

44.

CaCO3 + 2HCl -----> CaCl2 + H2O + CO2

Ca-40 C-12 O-16 H-1 Cl-35.5.

find total mass of reactants .

a)

100

b)

73

c)

136.5

d)

173

45.

Which of the following is a promoter in reaction

N2 + 3H2 ----> 2NH3

a)

Fe

b)

Cu

c)

Mo

d)

Nitrogen

46.

Which of the following is a catalyst in reaction

N2 + 3H2 ----> 2NH3

a)

Fe

b)

Cu

c)

Mo

d)

Nitrogen

47.

Which is the formula of baking soda.

a)

NaHCO3

b)

Na2CO3

48.

Which is the formula of sand.

a)

SiO4

b)

SiO3

c)

SiO

d)

SiO2

49.

If the valency of A is 3 and B is 2 then formula of compound between A and B is

a)

AB

b)

A3B2

c)

A2B3

d)

AB3

50.

If the formula of a sulphate of a metal M is MSO4 What will be the formula of chloride of metal M?

a)

MCl

b)

MCl2

c)

MCl3

d)

M2Cl

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