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Ch-1,4 Shreyas

Total questions: 125

Worksheet time: 1hrs 24mins

Name
Class
Date
1.

(a)   of electrons is oxidation.

2.

Electrolysis of water is a decomposition reaction. The molar ratio of hydrogen and oxygen gases liberated during electrolysis of water is:

a)

1:1

b)

2:1

c)

1:2

d)

4:1

3.

What is observed when a solution of potassium iodide is added to silver nitrate solution?

a)

No reaction takes place

b)

White precipitate of silver iodide is formed

c)

Yellow precipitate of AgI is formed

d)

AgI is soluble in water

4.

The oxidizing agent in the following reaction is (a)  

CuO + H2 -->Cu + H2O

5.

Rusting of iron is a physical change.

a)

True

b)

False

6.

CaO + H2O --> Ca(OH)2

This is an example of

a)

Combination reaction

b)

Decomposition reaction

c)

Displacement reaction

d)

None of the above

7.

The process of wasting away of metals on exposure to moist air is called (a)   .

8.

Assertion: AgBr is used on photographic and X – ray film.

Reason: AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.

a)

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

b)

The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

c)

Assertion is true but the reason is false.

d)

The statement of the Assertion is false but the Reason is true.

9.

Assertion: Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.

Reason: Zinc reacts with oxygen to form zinc oxide.

a)

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

b)

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

c)

Assertion is true but the reason is false.

d)

The statement of the Assertion is false but the Reason is true.

10.

Corrosion of iron is known as (a)   .

11.

when does a chemical reaction take place ?

a)

when a physical change occurs

b)

when a chemical change occurs

c)

both a and b

d)

none of the above

12.

What are the substances on the left side called and right side of the chemical equation called respectively ?

a)

products and reactants

b)

groups and electrons

c)

nothing

d)

reactants and products

13.

Which of the following is not a physical change?

a)

(a) Boiling of water to give water vapour

b)

(b) Melting of ice to give water

c)

(c) Dissolution of salt in water

d)

(d) Combustion of Liquefied Petroleum Gas (LPG)

14.

Which of the following statements about the given reaction are correct?

3Fe(s) + 4H2O(g) => Fe3O4(s) + 4H2(g)

(i) Iron metal is getting oxidised

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as oxidising agent

a)

(a) (i), (ii) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (i), (ii) and (iv)

d)

(d) (ii) and (iv)

15.

which of the following observations helps to determine that a chemical reaction has taken place ?

a)

change in state

b)

change in color

c)

change in temperature

d)

all of the above

16.

A solution of X is used for white washing walls. it reacts slowly with Y in air to form a thin layer of B on walls which gives walls a shiny finish. which of the following options correctly represents X,Y and B ?

a)

X =slaked lime , Y = nitrogen , B=calcium oxide

b)

X =Calcium Hydroxide, Y=Oxygen, B = Calcium carbonate

c)

X= slaked lime, Y=Carbon oxide,B= calcium chloride

d)

X= slaked lime,Y=Carbon dioxide,B=Calcium carbonate

17.

What is the process that is happening in this image ? And also give the name of the two gas that are present in two test tubes and the ratio they(gases) are present in .

a)

process= thermal decomposition,

gases present=hydrogen,carbon dioxide, ratio=2:1

b)

process=corrosion,

gases present=oxygen,hydroxide, ratio=2:1

c)

process=electrolysis of hydrogen polyoxide

gases present=hydrogen,oxygen, ratio=2:1

d)

process=electrolysis of water

gases present=hydrogen,oxygen,ratio=4:2

18.

Choose the correct balanced equation of barium chloride and aluminium sulphate.

a)

3BaCl2+Al2(SO4)3→3BaSO4+2AlCl3

b)

2BaCl2+Al2(SO4)3→2BaSO4+2AlCl3

c)

6BaCl2+2Al2(SO4)3→6BaSO4+4AlCl3

d)

none of the above

19.

Choose the incorrect statement from the following options about saving foods from rancidity.

a)

keep food items in air tight containers

b)

flushing food items with carbon dioxide

c)

flushing food items with nitrogen

d)

keep food items in air loose containers

20.
The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction
a)
(i) and (iv)
b)
(ii) and (iii)
c)
(i) and (iii)
d)
(iii) and (iv)
21.

Silver article turns black when kept in open for a few days due to formation of

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

22.

A chemical equation should be balanced to :

a)

show conservation of energy

b)

show conservation of mass

c)

to make equation attractive

d)

All of the above

23.

In which of the following process a chemical reaction has taken place?

a)

Ice melts into water

b)

A wet shirt got dried in sunlight

c)

A brown layer is formed over iron rod kept in air

d)

sugar getting dissolved in water

24.
Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride
a)
(a) (i) only
b)
(i) and (iii)
c)
(c) (ii) and (iii)
d)
(d) (iv) only
25.
Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid(iii) Evaporation of water (iv) Sublimation of camphor (crystals)
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(i) and (iv)
d)
(iii) and (iv)
26.

The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:

a)

Exothermic process

b)

Endothermic process

c)

Reversible process

d)

Physical process

27.

A chemical reaction does not involve:

a)

Formation of new substances having entirely different properties than that of the reactants

b)

Breaking of old chemical bonds and formation of new chemical bonds

c)

Rearrangement of the atoms of reactants to form new products

d)

Changing of the atoms of on element into those of another element to form new products

28.

One of the following processes does not involve a chemical reaction. That is:

a)

Melting of candle wax when heated

b)

Burning of candle wax when heated

c)

Digestion of food in our stomach

d)

Ripening of banana

29.

It is necessary to balance a chemical equation in order to satisfy the law of:

a)

Conservation of motion

b)

Conservation of momentum

c)

Conservation of energy

d)

Conservation of mass

30.

When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

a)

Blue to green.

b)

Green to blue.

c)

Green to brown.

d)

Green to yellow.

31.

The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

a)

Copper granules

b)

Magnesium ribbon

c)

Sodium pellets

d)

Aluminium dust

32.

The neutralization reaction between an acid and a base is a type of:

a)

Double displacement reaction

b)

Displacement reaction

c)

Addition reaction

d)

Decomposition reaction

33.

Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

a)

Make the ribbon surface shinier

b)

Remove the layer of magnesium oxide from the ribbon surface

c)

Remove the layer of magnesium carbonate from the ribbon surface

d)

Remove the moisture from the ribbon surface

34.

What happens when copper rod is dipped in iron sulphate solution :-

a)

Copper displaces iron

b)

Blue color of copper sulphate solution is obtained

c)

No reaction takes place

d)

Reaction is exothermic

35.

What is the another name of quick lime?

a)

Calcium hydroxide

b)

Calcium oxide

c)

Carbon dioxide

d)

Sodium oxide

36.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All of the above

37.

Which of the following product is formed when calcium oxide reacts with water?

a)

Slaked lime

b)

Carbon dioxide

c)

Calcium oxide

d)

Oxygen gas

38.

What happens when silver chloride is put under sunlight?

a)

Silver metal and chlorine gas are formed

b)

Silver metal and hydrogen gas are formed

c)

Only silver metal is formed

d)

Only hydrogen gas is formed

39.

What happens when carbon dioxide is passed in lime water?

a)

Lime water turns milky because of formation of calcium carbonate

b)

Lime water turns milky because of formation of water

c)

Lime water turns red because of formation permanganate

d)

Lime water turns red because of formation of copper sulphate

40.

What happens when sodium sulphate solution is mixed with the solution of barium chloride?

a)

No reaction takes place

b)

Barium sulphate is formed

c)

Sulphur dioxide gas is formed

d)

Sodium sulphate is formed

41.

Why are articles made of iron painted to prevent rust?

a)

Paint makes articles made of iron beautiful

b)

Paint prevents iron articles to come in contact with moisture present in air.

c)

Paint prevents iron articles to getting sticky

d)

All of the above

42.

Which of the following is termed as rancidity?

a)

Reduction of oxygen present in food

b)

Oxidation of sugar present in food

c)

Oxidation of oil present in food

d)

All of the above

43.

How rancidity can be prevented?

a)

By adding antioxidants in food

b)

By adding more oxygen to food

c)

By keeping food items in open

d)

All of the above

44.

Which of the following is termed as exothermic reaction?

a)

Reaction in which heat is evolved

b)

Reaction in which heat is absorbed

c)

Reaction in which there is loss of oxygen

d)

Reaction in which there is gain of hydrogen

45.

Which of the following termed as reducing agent?

a)

Which gives oxygen

b)

Which removes oxygen

c)

Which removes hydrogen

d)

All of the above

46.
Which type of elements are used in computer chips, lasers, and transistors?
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Metals and Metalloids
47.

Identify the correct group of soft metals from the following

a)

Sodium, Alluminium and Copper

b)

Sodium, Potassium and Lithium

c)

Copper, Manganese and Magnesium

d)

Zinc, Barium and Lithium

48.

Zn, Fe, Al and Mg. When we arrange these elements in the ascending order of their

reactivity series we get

a)

Mg < Al < Zn < Fe

b)

Al < Mg < Fe < Zn

c)

Zn < Al < Mg < Fe

d)

Fe < Zn < Al < Mg

49.
Where are the non-metallic elements found in the periodic table?
a)
In the middle
b)
In the top rows
c)
On the left-hand side
d)
On the right-hand side
50.
Which of the following is a property of a non-metal?
a)
Conducts electricity and heats well
b)
Can be hammered into thin sheets
c)
Is brittle and breaks easily
d)
Has a shiny, metallic luster
51.
The list which contains only metals is .......
a)
aluminium, copper, nitrogen
b)
iron, oxygen, hydrogen
c)
iron, silver, aluminium
d)
iron, sulphur, copper
52.

_____ is used in vulcanization of rubber

a)

Sodium

b)

Chlorine

c)

Sulphur

d)

Iodine

53.

_______ are used in match sticks heads

a)

Nickel and Phosphorus

b)

Phosphorus and Neon

c)

Gold and Sulfur

d)

Phosphorus and Sulfur

54.

The solution of ash of magnesium ribbon is

a)

acidic      

b)

basic             

c)

neutral     

d)

all of these

55.

  Which of the following metal is generally extracted by electrolysis ?

a)

Zn

b)

Al

c)

Fe                     

d)

Cu

56.

Amphoteric oxides react with both acids and alkali to form salt and water. Pick the amphoteric oxide (s)

a)

Aluminium oxide

b)

calcium oxide

c)

zinc oxide

d)

Both aluminium and zinc oxide

57.

Of these, the metals which occur  in free state as well as combined state are

a)

Na, Mg                   

b)

Mg, Au               

c)

Zn, K

d)

Cu, Ag

58.

Which of the following is not a metalloid?

a)

Rhenium

b)

Germanium

c)

Tellurium

d)

Silicon

59.

The colour of PbO2 is

a)

Dark Brown

b)

Yellow

c)

White

d)

Light Blue

60.

Select the correct statement:

a)

All ores are minerals

b)

All minerals are ores

61.

Which one of the following gas burns with the "pop" sound?

a)

Oxygen

b)

Hydrogen

c)

Chlorine

d)

Hydrogen Sulphide

62.

MgO +H2O =

a)

MgOH

b)

Mg2O

c)

Mg(OH)2

d)

Mg(O)2

63.

Potassium + Oxygen gives

a)

2K2O

b)

2CaO

c)

2mgO

d)

2N2O

64.

Which one of the following metal reacts vigorously with oxygen and water?

a)

Sodium

b)

Potassium

c)

Calcium

d)

Magnesium

65.

When MgO is dissolved in water, Mg(OH)2 is obtained. The solution thus obtained is _______________ in nature.

a)

Amphoteric

b)

Alkaline

c)

Neutral

d)

Acidic

66.

Identify the non-metal which exists in a liquid state in room temperature 25∘C.

a)

Aluminium

b)

Mercury

c)

Iodine

d)

Bromine

67.

What is the chemical formula of copper sulphate?

a)

CuSO4

b)

CuCO3

c)

CuCI2

d)

CuO

68.

When magnesium reacts with water and oxygen, what can we observe?

a)

Coated with black layer

b)

Does not burn

c)

Burns with a yellow flame

d)

Burns with a brilliant white flame.

69.

Zinc + Sulphuric = Zinc Sulphate + ______________

a)

Oxygen

b)

Hydrogen Gas

c)

Nitrogen

d)

Hydrogen Sulphate

70.

Metals react with acids to produce _____________.

a)

Oxygen

b)

Smoke

c)

Hydrogen

d)

Nitrogen

71.

Metal react with oxygen to produce _________ oxides and non-metal react with oxygen to produce_________ oxides.

a)

Acidic, Basic

b)

Basic, Acidic

c)

Basic, Basic

d)

Acidic, Acidic

72.

The presence of _________ and _________ are necessary for iron to rust.

a)

Air, Water

b)

Rust, Water

c)

Air, Rust

d)

Hydrogen, Water

73.

Chemical name of Potassium is :

a)

Pu

b)

K

c)

Po

d)

Ks

74.

Chemical name of Sodium is :

a)

Su

b)

So

c)

S

d)

Na

75.

Mercury is more reactive than Sodium.

a)

True

b)

False

76.

Potassium is highly reactive while Platinum is least reactive.

a)

True

b)

False

77.

The element which is stored under kerosene is-

a)

Sulphur

b)

Phosphorus

c)

Sodium

d)

Silicon

78.

Which of the following metal exist in liquid state in room temperature?

a)

Mercury

b)

Bromine

c)

Aluminium

d)

Sodium

79.

Corrosion of copper is-

a)

Brown in colour

b)

Black in colour

c)

Green in colour

d)

Blue in colour

80.

Non- metal which is kept in water to prevent reaction with oxygen-

a)

Phosphorus

b)

Sodium

c)

Potassium

d)

Sulphur

81.

Potassium + Oxygen gives

a)

2K2O

b)

2CaO

c)

2mgO

d)

2N2O

82.

MgO +H2O =

a)

MgOH

b)

Mg2O

c)

Mg(OH)2

d)

Mg(O)2

83.

Which one of the following gas burns with the "pop" sound?

a)

Oxygen

b)

Hydrogen

c)

Chlorine

d)

Hydrogen Sulphide

84.

Which one of the following gas burns with the "pop" sound?

a)

Oxygen

b)

Hydrogen

c)

Chlorine

d)

Hydrogen Sulphide

85.

Which one of the following metal reacts vigorously with oxygen and water?

a)

Sodium

b)

Potassium

c)

Calcium

d)

Magnesium

86.

When MgO is dissolved in water, Mg(OH)2 is obtained. The solution thus obtained is _______________ in nature.

a)

Amphoteric

b)

Alkaline

c)

Neutral

d)

Acidic

87.

Identify the non-metal which exists in a liquid state in room temperature 25∘C.

a)

Aluminium

b)

Mercury

c)

Iodine

d)

Bromine

88.

What is the chemical formula of copper sulphate?

a)

CuSO4

b)

CuCO3

c)

CuCI2

d)

CuO

89.

Zinc + Sulphuric = Zinc Sulphate + ______________

a)

Oxygen

b)

Hydrogen Gas

c)

Nitrogen

d)

Hydrogen Sulphate

90.

Metals react with acids to produce _____________.

a)

Oxygen

b)

Smoke

c)

Hydrogen

d)

Nitrogen

91.

Chemical name of Potassium is :

a)

Pu

b)

K

c)

Po

d)

Ks

92.

Chemical name of Sodium is :

a)

Su

b)

So

c)

S

d)

Na

93.

Mercury is more reactive than Sodium.

a)

True

b)

False

94.

Potassium is highly reactive while Platinum is least reactive.

a)

True

b)

False

95.

The element which is stored under kerosene is-

a)

Sulphur

b)

Phosphorus

c)

Sodium

d)

Silicon

96.

Corrosion of copper is-

a)

Brown in colour

b)

Black in colour

c)

Green in colour

d)

Blue in colour

97.

Non- metal which is kept in water to prevent reaction with oxygen-

a)

Phosphorus

b)

Sodium

c)

Potassium

d)

Sulphur

98.
What is an ore?
a)
a solid metal
b)
a rock cantaining a metal combined with other elements
c)
an element
d)
an object used to row a boat
99.
What is the removal of oxygen from a substance called?
a)
reduction
b)
extraction
c)
electrolysis
d)
oxidation
100.
Which element cannot be extracted from its ore by reduction with carbon?
a)
iron
b)

magnesium

c)
copper
d)
lead
101.
What is the name of the process that uses electricity to separate the elements in a compound?
a)
reduction
b)
electrolysis
c)
extraction
d)
mining
102.
How could you extract sodium from molten sodium chloride?
a)
reduction by carbon
b)
electrolysis
c)
decomposition
d)
oxidation
103.
How would you best extract iron from haematite (iron ore)?
a)
reduction by carbon
b)
electrolysis
c)
decomposition
d)
oxidation
104.
Name a metal that could be extracted from its metal oxide by heating with carbon.
a)
iron
b)
aluminium
c)
gold
d)
magnesium
105.
A method of extracting metals from their ores that are more reactive than carbon.
a)
carbon extraction
b)
fractional distillation
c)
electrolysis
d)
cracking
106.

How would you extract Silver?

a)

Heating with coke

b)

Electrolysis

c)

The blast furnace

d)

Silver is found uncombined

107.

What method would be used in order to extract potassium?

a)

Heating with Carbon

b)

The blast furnace

c)

Potassium is found uncombined

d)

Electrolysis

108.

Choose all the inert electrodes:

a)

iron

b)

nickel

c)

graphite

d)

platinum

109.

The electrolytic deposition of a superior metal on a baser metal is:

a)

electro-refining

b)

electro-plating

c)

electro-metallurgy

d)

electrolysis

110.

Which of the following are strong electrolytes?

a)

NH4OH

b)

HBr

c)

HI

d)

Mg(OH)2

111.

In the process of electrolysis, the ions are discharged as ______ _____ at the respective electrodes.

(a)  

112.

Ions discharged in electrolysis depends on the factor:

a)

relative electrode potential

b)

concentration of ions

c)

relative electrode charge

d)

density of electrolyte

113.

The passage of electricity through an electrolyte causes the metallic ions to migrate towards the _______ and the non-metallic ions to migrate towards the _______. (use and in between to separate the answers)

(a)  

114.

Which is the correct electrochemical series?

a)

Na, Al, Fe, Mg, Zn

b)

Mg, Fe, Zn, Na, Al

c)

Na, Mg, Al, Zn, Fe

d)

Fe, Zn, Na, Mg, Al

115.

The preferential discharge of ions present in an electrolyte at the respective electrodes is also known as: (type all in lowercase)

(a)  

116.

Choose all the correct reasons for electroplating:

a)

Improves the electrical conductivity of the article.

b)

Prevents corrosion or rusting of the base metal.

c)

Makes the article dull.

d)

Makes the article attractive.

117.

During electroplating an article with silver, the electrolyte used is:

a)

silver nitrate solution

b)

silver cyanide solution

c)

sodium argentocyanide solution

d)

nickel sulphate solution

118.

Which pair of electrolytes is not inert?

a)

mercury and carbon

b)

mercury and sodium

c)

silver and carbon

d)

copper and silver

119.

Cations are negatively charged ions.

a)

True

b)

False

120.

The blue colour of aq. Copper[II] sulphate solution ________ during electrolysis of aq. CuSO4 using copper electrodes, but ______ when platinum electrodes are used.

a)

remains unchanged ; fades

b)

remains unchanged; remains unchanged

c)

fades ; fades

d)

None of the above

121.

The particles in weak electrolytes are:

a)

molecules only

b)

ions and unionised molecules

c)

ions only

d)

All of the above

122.

The anode is the _______ electrode while the cathode is the ______ electrode. (use and in between to separate the answer)

(a)  

123.

Which metal is used in electroplating cans to store food?

a)

nickel

b)

tin

c)

chromium

d)

silver

124.

The preferential discharge of the ions depends on its position in the (a)   series.

125.

_____ ____ are essential for conducting electricity. (type all in lowercase)

(a)  

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