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Worksheets

10th

Total questions: 101

Worksheet time: 1hrs 10mins

Name
Class
Date
1.

Jacob Berzelius put forward

a)

Vital force theory

b)

Law of mass action

c)

Both

d)

None

2.
static equilibrium
a)
condition of continuous, random movement of particles but no overall change in concentration of materials
b)
the reaction that forms reactants from products
c)
a condition where the reaction occurring in a system is completely halted and there exists no movement between the reactants and the products corresponding to the chemical reaction
d)
a measurement of how much solute exists within a certain volume of solvent or solution
3.
dynamic equilibrium
a)
condition of continuous, random movement of particles but no overall change in concentration of materials
b)
the process by which one or more substances change to produce one or more different substances
c)
a condition where the reaction occurring in a system is completely halted and there exists no movement between the reactants and the products corresponding to the chemical reaction
d)
a substance that takes part in and undergoes change in a chemical reaction
4.

What are the two factors to look for when determining if the reaction is at equilibrium?

a)

Forward reaction rate is faster than the reverse reaction rate and amounts of reactants are greater than the products

b)

Forward and reverse reaction rates are equal and amounts of reactants and products are constant

c)

Forward reaction rate is slower than the reverse reaction rate and amounts of reactants are greater than the products

d)

Forward reaction rate is faster than the reverse reaction rate and amounts of products are greater than the reactants

5.
When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in
a)
Chemical Equilibrium
b)
Chemical Balance
c)
Chemical Constant
d)
Chemical Reaction
6.

During equilibrium, the rates of the forward and the reverse reaction are ________

a)

equal

b)

unequal

c)

unequal for exothermic reactions

d)

unequal for endothermic reactions

7.

During equilibrium, the amount of the products and the amount of the reactants are __________.

a)

equal

b)

constant (unchanging)

c)

constantly increasing

d)

constantly decreasing

8.

In the equilibrium expression, K represents

a)

the reactants' concentration

b)

the products' concentration

c)

the rate constant

d)

the equilibrium constant

9.

Calculate the value of the equilibrium constant at 127°C for the following reaction:

2NH3(g)→ N2(g)+3H2(g)2NH_{3\left(g\right)}\rightarrow\ N_{2\left(g\right)}+3H_{2\left(g\right)}  

a)

3.8×1043.8\times10^4  

b)

3.8×1023.8\times10^2  

c)

8.5×10−18.5\times10^{-1}  

d)

3.1×1033.1\times10^3  

10.
For the reaction...
SO2 + O2  <−>  SO3
If the concentration of SO2 is increased, the equilibrium of the reaction will shift ___________.
a)
left
b)
right
c)
left and right 
d)
neither left nor right
11.
For the reaction...
H2 (g)  + Cl2 (g) <−>  2HCl (g)  +  heat
If the temperature is cooled, the _________ reaction will be favored.
a)
forward
b)
reverse
c)
forward and reverse
12.
For the reaction...
N2 (g) +  3 H2 (g) <−> 2 NH3 (g)

If the pressure in the system is increased,  which substance will increase in concentration?
a)
N2
b)
H2
c)
N2 and H2
d)
NH3
13.
What are the two factors to look for when determining if the reaction is at equilibrium?
a)
Forward reaction rate is faster than the reverse and concentrations are equal
b)
Forward and reverse reaction rates are equal and concentration is constant
c)
Forward and revers reaction rates are equal and concentration is equal
d)
Forward reaction rate is faster than the reverse and concentration is equal
14.

H2(g)+Cl2(g)⇌2HCl(g)

The forward reaction is exothermic. What will happen to the equilibrium if the temperature is increased?

a)

equilibrium shifts right

b)

equilibrium shifts left

c)

You cannot predict the effect

d)

no change

15.

For the following reaction: H2(g) + Cl2 (g) ↔ 2HCl(g), calculate the concentration of HCl when Keq= 2.3x10-5, [H2]= 0.0056mol, [Cl2]= 0.0048mol.

a)

6.2 x 10-10 M

b)

2.5 x 10-5 M

c)

1.1 M

d)

1.2 M

16.

1.       What happens when a solution of an acid is mixed with a solution of a base in a test tube?

a)

Temperature of the solution decreases

b)

Temperature of the solution increases.

c)

    Temperature of the solution remains the same

d)

None of the above

17.

In terms of acidic strength, which one of the following is in the correct increasing order?

a)

Water<Acetic acid<Hydrochloric acid

b)

Water<Hydrochloric acid<Acetic acid

c)

Acetic acid<Water<Hydrochloric acid

d)

Hydrochloric acid<Water<Acetic acid

18.

Methyl orange is:

a)

Pink in acidic medium, yellow in basic medium

b)

Yellow in acidic medium, pink in basic medium

c)

Colourless in acidic medium, pink in basic medium

d)

Pink in acidic medium, colourless in basic medium

19.

Na2CO3.10H2O is:

a)

Washing soda

b)

Baking soda

c)

Bleaching powder

d)

Tartaric acid

20.

Alkalis are:

a)

Acids, which are soluble in water

b)

Acids, which are insoluble in water

c)

Basses, which are insoluble in water

d)

Bases, which are soluble in water

21.

Which of the following statements is correct about an aqueous solution of an acid and of a base

Higher the pH, stronger the acid

Higher the pH, weaker the acid

Lower the pH, stronger the base

Lower the pH, weaker the base

 

a)

 (i) and (iii)  

b)

(ii) and (iii)

c)

(i) and (iv)

d)

(ii) and (iv)

22.

A strong acid :

a)

Completely gets ionized in water

b)

Partially gets ionized in water

c)

Do not get ionized in water

d)

All of these

23.

Sodium hydroxide is a:

a)

Weak base

b)

Weak acid

c)

Strong base

d)

Strong acid

24.

An aqueous solution turns red litmus solution blue, Excess addition of which of the following solution would reverse the change?

a)

Baking powder

b)

Lime

c)

Ammonium hydroxide solution

d)

Hydrochloric acid

25.

Sodium hydroxide turns phenolphthalein solution.

a)

Pink

b)

Yellow

c)

Colourless

d)

Orange

26.

Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of:

a)

Acetic acid

b)

Citric acid

c)

Lactic acid

d)

Oxalic acid

27.

Which of the given is a strong base?

a)

Calcium hydroxide

b)

Magnesium hydroxide

c)

Ammonium hydroxide

d)

Potassium hydroxide

28.
What is kerosene used for?
a)
Fuel for ships
b)
Fuel for lorries
c)
Fuel for airplanes
d)
Making roads
29.

What process is used to separate crude oil in hydrocarbons with different chain lengths?

a)

distillation

b)

fractional distillation

c)

cracking

d)

polymerisation

30.

Molecules collected at the bottom of the fractionating column tend to be...

a)

more viscous, less flammable and less volatile

b)

less viscous, more flammable and more volatile

c)

more viscous, more flammable and less volatile

d)

less viscous, less flammable and more volatile

31.

The most viscous fraction in the fractional distillation of crude oil

a)

kerosene

b)

fuel oil

c)

bitumen

d)

refinery gas

32.

For surfacing roads

a)

bitumen

b)

refinery gas

c)

petroleum

d)

diesel

33.

According to Mendeleev periodic law, the elements were arranged in the Periodic table in order of

a)

Increasing atomic number

b)

Decreasing atomic number

c)

Increasing atomic mass

d)

Decreasing atomic mass

34.

What type of hydrocarbon is saturated?

a)

Alkane

b)

Alkene

c)

Alkyne

d)

Aromatic

35.

What type of hydrocarbon contains a benzene ring?

a)

Alkane

b)

Alkene

c)

Alkyne

d)

Aromatic

36.

What type of hydrocarbon has the general formula CnH2n?

a)

Alkane

b)

Alkene

c)

Alkyne

d)

Aromatic

37.

What type of hydrocarbon has the general formula CnH2n-2?

a)

Alkane

b)

Alkene

c)

Alkyne

d)

Aromatic

38.

What type of hydrocarbon has the general formula CnH2n+2?

a)

Alkane

b)

Alkene

c)

Alkyne

d)

Aromatic

39.

What type of hydrocarbon is characterized by the presence of a double bond?

a)

Alkane

b)

Alkene

c)

Alkyne

d)

Aromatic

40.

How many Hydrogen atoms are needed in an alkane that has 4 carbon atoms?

a)

4

b)

6

c)

8

d)

10

41.

What is the chemical formula of an alkene that has 3 carbon atoms?

a)

C3H2

b)

C3H4

c)

C3H6

d)

C3H8

42.

If a mixture has uniform composition is called

a)

compound

b)

homogeneous

c)

heterogeneous

d)

combination

43.

Which of the following describes a noble gas?

a)

massless

b)

unreactive

c)

good heat conductors

d)

good electrical conductors

44.

Which of the following is best classified as a heterogeneous mixture?

a)

pizza

b)

tea

c)

water

d)

juice

45.

Which of the following symbols does not match the element name given?

a)

Al, Aluminum

b)

Co, Copper

c)

K, Potassium

d)

P, Phosphorus

46.

Up to which element,law of octaves found to be applicable

a)

Oxygen

b)

Calcium

c)

Cobalt

d)

Potassium

47.

In Mendeleev periodic table,gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic table later

a)

Germanium

b)

Chlorine

c)

Oxygen

d)

Silicon

48.

Which of the following is the outermost shell for elements of period 2 ?

a)

K

b)

L

c)

M

d)

N

49.

Which of the following is the outermost shell for elements of period 2 ?

a)

K

b)

L

c)

M

d)

N

50.

Name the compound with formula C2H4

a)

Methane

b)

Ethane

c)

Propane

d)

Ethene

51.

The lowest layer of the atmosphere

a)

troposphere

b)

mesosphere

c)

stratosphere

d)

exosphere

52.

The layer of the atmosphere that contains the Ozone Layer

a)

troposphere

b)

mesosphere

c)

thermosphere

d)

stratosphere

53.

a mixture of gases that surrounds the Earth

a)

air pressure

b)

green house effect

c)

atmosphere

d)

carbon dioxide

54.

Which layer contains the coldest temperatures in the atmosphere?

a)

Troposphere

b)

Exosphere

c)

Thermosphere

d)

Mesosphere

55.

What happens to temperatures in the Mesosphere?

a)

As altitude increases, temperatures decrease

b)

As altitude increases, temperatures increase

56.

The layer of the atmosphere that contains weather.

a)

Troposphere

b)

Stratosphere

c)

Mesosphere

d)

Thermosphere

57.

The thickest layer at the atmosphere is

a)

Stratosphere

b)

Mesosphere

c)

Exosphere

d)

Thermosphere

58.

Ozone in the stratosphere is formed in two steps. The first involves breaking down oxygen (O2) by

a)

particulates

b)

carbon dioxide

c)

ozone

d)

sunlight

59.

In which layer does weather occur?

a)

Stratosphere

b)

Troposphere

c)

Mesosphere

d)

Thermosphere

60.

The ozone layer is broken down by which of the following chemical?

a)

SOx & H2SO4

b)

NOx & VOCs

c)

CFCs and halons

d)

CO2, CH4,

61.

CFCs are made up of which three compounds

a)

Calcium, fluorine,

carbon

b)

Chlorine, Fluorine, Carbon

c)

Carbon, Bromine, Calcium

d)

Chromine, Fluoride, Carbon

62.

The ozone hole is over which place?

a)

Antartica

b)

South America

c)

Aftrica

d)

Arctic

63.
The ozone layer protects us from
a)
UV rays
b)
CFCs
c)
Increased atmospheric heat
d)
Decreased atmospheric heat
64.
The ozone layer is damaged by
a)
CFCs
b)
Increase in greenhouse gases
c)
Increased global temperatures
d)
Sulfuric and nitric acids
65.

Which of the following is a source of air pollution?

a)

Difficulty in breathing

b)

Factories

c)

Eye irritation

d)

Drinking water

66.

The depletion in the Ozone layer is caused by:

a)

Carbon dioxide

b)

Nitrous oxide

c)

Methane

d)

Chlorofluorocarbon

67.

Which of these sets of three items produce CFCs

a)

cars, factories, and cardboard

b)

spray cans, cardboard, insulation

c)

spray cans, refrigerant, cardboard

d)

spray cans, refrigerant, insulation

68.

Hardness in water is caused by the presence of:

a)

Sodium chloride

b)

Sodium carbonate

c)

Calcium chloride

d)

Potassium nitrate

69.

Permanent hardness in water is caused by the presence of:

a)

Calcium bicarbonate

b)

Magnesium sulphate

c)

Both of them

d)

None of them

70.

The process of removing extra common salt from water is called:

a)

Ionization

b)

Softening

c)

Disinfections

d)

Desalination

71.

The method that uses Na2CO3

a)

baking powder

b)

salination through baking soda

c)

desalination through washing soda

d)

none of the above

72.

Which of these do not cause temporary hardness in water?

a)

Ca(HCO3)2

b)

Magnesium Bicarbonate

c)

Calcium Chloride

d)

Mg(HCO3)2

73.

Which of these do not cause temporary hardness in water?

a)

Ca(HCO3)2

b)

Magnesium Bicarbonate

c)

Calcium Chloride

d)

Mg(HCO3)2

74.
Which end of the water molecule has a slightly positive charge?
a)
the oxygen end
b)
the hydrogen end
c)
both ends are slightly positive
d)
neither end is positive
75.

What is an intermolecular force?

a)

Forces around molecules

b)

Gravity

c)

Forces between molecules

d)

Forces within a molecule like a covalent or ionic bond

76.
The property where water can pull itself up tubes or through spaces in paper or fabrics.
a)
adhesion
b)
capillary action
c)
cohesion
d)
universal solvent
77.
Water is a universal solvent because it...
a)
It can be found anywhere
b)
It freezes when it gets cold
c)
floats when frozen
d)
Dissolves most substances
78.

What is the main ore of aluminum?

a)

Al2O3.n H2O

b)

Al2SO4.n H2O

c)

Al(OH)3.n H2O

d)

Al3O4.n H2O

79.

Sulphide ores are concentrated using ______ method.

a)

Wilfley Table

b)

Hydraulic Separation

c)

Magnetic Separation

d)

Froth Floatation

e)

Leaching

80.

Carbonate ores are first ____________ and converted into oxide ores.

a)

Roasted

b)

Calcinated

c)

Combusted

d)

Neutralized

81.

Identify the diagram:

a)

Separation based on gravity

b)

Magnetic separation

c)

Forth floatation

d)

Leaching

82.

Which one of the following is known thermite reaction?

a)

Fe2O3 + Al

b)

Al2O3 + Fe

c)

ZnS + O2

d)

Cu2S + Cu2O

83.

Among the following compounds identify the compound that has all three bonds (ionic, covalent and

     coordinate bond)

a)

 Ammonia

b)

Ammonium chloride

c)

Sodium hydroxide

d)

Calcium chloride

84.

Why do atoms share electrons in covalent bonds?

a)

 To increase their atomic numbers                      

b)

   To attain a noble-gas electron configuration

c)

   To become more polar                                              

d)

   To becomes ions and attract each other

85.

Alkalis are:

a)

Acids, which are soluble in water

b)

Acids, which are insoluble in water

c)

Basses, which are insoluble in water

d)

Bases, which are soluble in water

86.

Salts of normal elements [1 (IA) to 17 (VIIA)] are generally ……………

a)

Colourless

b)

Green

c)

White

d)

Blue

87.

An example of weak alkali solution is ……………….

a)

Sodium hydroxide

b)

Nitrogen dioxide

c)

Ammonium hydroxide

d)

Potassium hydroxide

88.

Calcium salts with sodium hydroxide give ……………… precipitates.

a)

Pink

b)

Blue

c)

White

d)

Green

89.

Oxides and hydroxides of certain metals such as …………….., ……………………, …………………. are amphoteric in nature.

a)

Zink, sodium, aluminium

b)

Zink, lead, copper

c)

Aluminium, copper, sodium

d)

Zink, lead, aluminum

90.

Electrolysis is the passage of ______________ through a liquid or a solution accompanied by a ___________  change.

a)

Chemical, electricity

b)

Electricity, chemical

c)

Electrons, chemical

d)

Electricity, physical

91.

The electrode where the current enters the electrolyte is called the _________

a)

Electric current

b)

Conductor

c)

Cathode

d)

Anode

92.

Painting a door is consider a chemical change.

a)

True

b)

False

93.

If a mixture has uniform composition is called

a)

compound

b)

homogeneous

c)

heterogeneous

d)

combination

94.

Which of the following is not a property of metals?

a)

malleabilty

b)

good conductor of electricity

c)

brittleness

d)

ductibility

95.

Which of the following describes a noble gas?

a)

massless

b)

unreactive

c)

good heat conductors

d)

good electrical conductors

96.

The element of Fe is a

a)

noble gas

b)

alkali metal

c)

transition metal

d)

halogen

97.

Matter that has a definite shape and volume

a)

liquid

b)

gas

c)

plasma

d)

solid

98.

Which of the following is best classified as a heterogeneous mixture?

a)

pizza

b)

tea

c)

water

d)

juice

99.

Which of the following is not a physical change?

a)

cutting paper

b)

breaking a glass

c)

cooking a cake

d)

melting butter

100.

Matter that has a definite shape and volume

a)

liquid

b)

gas

c)

plasma

d)

solid

101.

The following state of matter has the greatest kinetic energy___________.

a)

solid

b)

liquid

c)

gas

d)

plasma

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