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Grade-10 chem

Total questions: 101

Worksheet time: 1hrs 17mins

Name
Class
Date
1.

The digestion of food in the body is an example of

(a)   reaction.

2.

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

3.

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

4.

The oxidizing agent in the following reaction is (a)  

CuO + H2 -->Cu + H2O

5.

a copper penny turning greenish after a few years.

a)

Physical change

b)

Chemical change

6.

Balance the following chemical equation:

___NaBr + ___Cl2 ----> ____NaCl + ___Br2

Enter the values serially

(a)  

7.

What is the molecular formula for barium chloride?

a)

BaCl2

b)

BaCl

c)

Ba2Cl

d)

BaCl3

8.

Both CO2 and H2 gases are

a)

heavier than air

b)

colourless

c)

acidic in nature

d)

soluble in water

9.

Chemically rust is

a)

hydrated ferrous oxide

b)

only ferric oxide

c)

hydrated ferric oxide

d)

none of these

10.

A redox reaction is one in which-

a)

both the substance are reduced

b)

both the substance are oxidised

c)

an acid is neutralised by the base

d)

one substance is oxidised while the other is reduced

11.

On passing CO₂ gas through the product formed by the reaction between CaO and H₂O, solution becomes which colour?

a)

black

b)

red

c)

pink

d)

white

12.

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

13.

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

14.

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

15.

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

16.

(a)   of electrons is oxidation.

17.

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

18.

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

19.

The oxidizing agent in the following reaction is (a)  

CuO + H2 -->Cu + H2O

20.

Rusting of iron is a physical change.

a)

True

b)

False

21.

CaO + H2O --> Ca(OH)2

This is an example of

a)

Combination reaction

b)

Decomposition reaction

c)

Displacement reaction

d)

None of the above

22.

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

23.

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.

24.

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.

25.

Corrosion of iron is known as (a)   .

26.

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 increases 
b)
temperature of the solution decreases
c)
temperature remains constant
d)
no reaction
27.

Which of the following values would represent the pH of a strong base?

a)

1

b)

8

c)

7

d)

13

28.

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the statement is true about the gas evolved

a)
it turns lime water milky
b)
it burns with a pop sound
c)
it changes the soln colorless
d)
it has a pungent smell
29.

Complete the definition below:

Acids are....

a)

hydrogen donors.

b)

hydrogen acceptors.

c)

proton donors.

d)

proton acceptors.

30.

A substance has a pH value of 8. It is most likely to be what?

a)

Strong acid

b)

Weak acid

c)

Strong base

d)

Weak base

31.

Which indicator is colourless in acid and pink in alkali?

a)

Litmus

b)

Phenolphthalein

c)

Universal Indicator

d)

Methyl Orange

32.

What is made when a proton reacts with a hydroxide ion?

a)

Water

b)

An acid

c)

An alkali

d)

A salt

33.

1. An example of an acidic oxide is:

a)

MgO

b)

CO2

c)

BaO

d)

Na2O

34.

A lighted splint was held over a flask in which a gas was given off. The splint went out with a pop. Which gas was given off?

a)

hydrogen

b)

chlorine

c)

oxygen

d)

ammonia

35.

________________ is an example of an amphoteric oxide

a)

aluminium oxide

b)

carbon dioxide

c)

sulphur dioxide

d)

copper oxide

36.

Found in vinegar

a)

acetic acid

b)

sulphuric acid

c)

tartaric acid

d)

carbonic acid

37.

In a sample of solution, when methyl orange is added as an indicator, the solution turns yellow in colour , then resulting solution could be

a)

HCl

b)

Salt

c)

NaOH

d)

water

38.

When acids react with metal carbonate they give -

a)

CO2

b)

Salt

c)

Hydronium ion + Salt

d)

Salt + H2O + CO2

39.

If a few drops of concentrated acid accidentally spills over the hand of a student, what should be done

a)
wash the hand with saline solution
b)
wash the hand immediately with plenty of water and apply a soln of sodium hydrogen carbonate
c)
after washing apply soln of sodium hydroxide
d)
neutralise the acid wih a strong alkali
40.
Neutralization reactions
a)
formed from joining positive and negative ions 
b)
increases OH ions
c)

forms a salt and water

d)
increases H2O ions
41.

Which type of ions are produced by bases when they are mixed with water?

a)

OH-

b)

H+

c)

H2O

d)

HCl

42.

Anything with a pH of 7 is a(n)

a)

neutral substance

b)

acid

c)

base

d)

chemical salt

43.

A weak base will have a pH close to

a)

8

b)

6

c)

0

d)

14

44.

A very strong acid will have a pH of

a)

0

b)

14

c)

5

d)

9

45.
How are metal oxides formed?
a)
When metals react with oxide.
b)
When metals react with water.
c)
When metals react with air.
d)
When metals react with oxygen.
46.

Which of the following values would represent the pH of a strong base?

a)

1

b)

8

c)

7

d)

13

47.

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

a)

baking powder

b)

lime

c)

ammonium hydroxide solution

d)

HCL

48.
If a few drops of concentrated acid accidentally spills over the hand of a student,what should be done
a)
wash the hand with saline solution
b)
wash the hand immediately with plenty of water and apply a soln of sodium hydrogen carbonate
c)
after washing apply soln of sodium hydroxide
d)
neutralise the acid wih a strong alkali
49.

Sodium hydrogen carbonate when added to acetic acid evolves a gas . Which of the statement is true about the gas evolved?

a)

it turns lime water milky

b)

it burns with a pop sound

c)

it changes the solution colourless

d)

it has a pungent smell

50.

Which indicator is colourless in acid and pink in alkali?

a)

Litmus

b)

Phenolphthalein

c)

Universal Indicator

d)

Methyl Orange

51.

Complete this equation:

sulphuric acid + potassium hydroxide -->

a)

potassium oxide + hydrogen

b)

potassium chloride + water

c)

potassium sulfate + hydrogen

d)

potassium sulfate + water

52.

An example of an acidic oxide is:

a)

MgO

b)

CO2

c)

BaO

d)

Na2O

53.

________________ is an example of an amphoteric oxide

a)

aluminium oxide

b)

carbon dioxide

c)

sulphur dioxide

d)

copper oxide

54.

Found in vinegar

a)

acetic acid

b)

sulphuric acid

c)

tartaric acid

d)

carbonic acid

55.

Which one of the following types of medicines is used for treating indigestion?

a)

Antibiotic

b)

Analgesic

c)

Antacid

d)

Antiseptic

56.

Which of the following salts does not contain water of crystallization?

a)

Copper sulphate

b)

Baking soda

c)

Washing soda

d)

Gypsum

57.

Plaster of Paris is obtained by heating:

a)

Gypsum

b)

Limestone

c)

Sodium chloride

d)

Acetic acid

58.

Metal hydrogen carbonates react with acids to give

a)

salt ,water , chlorine

b)

salt , water and carbon di oxide

c)

salt and carbon di oxide

d)

salt , hydrogen and carbon dioxide

59.
To protect tooth decay we are advised to brush our teeth regurlarly.The toothpaste is
a)
acidic
b)
neutral
c)
basic
d)
corrosive
60.

A metal high in the reactivity series.....

a)

Forms unstable compounds.

b)

Can be obtained by the reduction of the ore with the carbon.

c)

Readily gains electrons.

d)

Burns to form basic oxides.

e)

Reacts readily with cold water to form Hydrogen.

61.
When an object changes shape when struck by a hammer.
a)
luster
b)
malleable
c)
brittleness
d)
ductile
62.

This picture illustrates copper's

a)

brittleness

b)

malleability

c)

ductility

63.
What is the formula for aluminum fluoride?
a)
AlF
b)
Al2F3
c)
AlF3
d)
Al3F2
64.
The name for CrN:
a)
Chromium nitride
b)
Chromium (I) nitride
c)
Chromium (III) nitride
d)
Chromium nitride (III)
65.

The metal that will release hydrogen gas on reacting with Dilute nitric acid will be:

a)

Sodium

b)

Iron

c)

Magnesium

d)

Zinc

66.

In this reactivity series, which of the following is the most reactive element?

a)

Gold

b)

Calcium

c)

Zinc

d)

Potassium

67.

What type of reaction is shown by this word equation?

lead nitrate + sodium → sodium nitrate + lead

a)

Decomposition

b)

Thermite

c)

Displacement

d)

Neutralisation

68.

In a displacement reaction, it is the ____________ reactive metal that is displaced from a compound.

a)

Heaviest

b)

Least

c)

Most

d)

Worst

69.

Complete the word equation:

lithium + silver nitrate →

a)

lithium + silver nitrate

b)

lithium + silver nitrite

c)

silver + lithium nitrate

d)

silver + lithium nitrite

70.
Complete the sentence.
A substance that is more basic has a _____ pH than a substance that is acidic.
a)
lower
b)
higher
c)
the same
d)
none of the above
71.

Zinc was placed into copper nitrate solution. Based on the picture, which is more acitve, copper or zinc?

a)

copper

b)

zinc

c)

sulfate

d)

they are equally reactive

72.

Which of the following does not react with water?

a)

Lithium

b)

Magnesium

c)

Lead

d)

Calcium

73.

How many bonds will a C atom form?

a)

1

b)

2

c)

3

d)

4

74.

Covalent compounds

a)

have high melting and boiling point

b)

are mostly soluble in water

c)

are formed between atoms of metals and non-metals

d)

are formed by the sharing of electrons in the bonding atoms.

75.

Which of the following is true for all hydrocarbon?

a)

They have carbon and hydrogen atoms only in the molecule.

b)

They have carbon, oxygen and hydrogen atoms in the molecule.

c)

They are in the same homologous series.

d)

They are saturated compounds.

76.

Which of the following is the most important source of organic carbon compounds?

a)

Plants

b)

Animals

c)

Coal

d)

Petroleum

77.

Which of the following is an alkane?

a)

C3H6

b)

C4H8

c)

C5H12

d)

C6H12

78.

What are the products formed when propane is burnt in excess oxygen?

a)

Carbon and hydrogen

b)

Carbon dioxide and water

c)

Carbon monoxide and water

d)

Carbon monoxide and hydrogen

79.

Which of the following compound is saturated hydrocarbon?

I CH3CH2CH2CH3

II CH3CHC(CH3)2

III CH3CH2CH(CH3)2

IV CH3CHCHCH3

a)

I and III

b)

II and IV

c)

I, II and III

d)

I, III and IV

80.

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:

a)

The food is not cooked completely

b)

The fuel is not burning completely

c)

The fuel is wet

d)

The fuel is burning completely

81.

Cation is formed when

a)

Atom gains electrons

b)

Atom loses electrons

c)

Proton is lost by the atom

d)

Atom shares electrons

82.

Which of the following is the molecular formula of cyclobutane?

a)

C4H10

b)

C4H6

c)

C4H8

d)

C4H4

83.

The property of self-linkage among identical atoms to form long chain compounds is known

a)

Superposition

b)

Catenation

c)

Isomerisation

d)

Halogenation

84.

Which of the followings is the major constituent of the liquefied petroleum gas?

a)

Ethane

b)

Methane

c)

Propane

d)

Butane

85.

From which of the following substance pencil lead is formed?

a)

Charcoal

b)

Wood

c)

Lead

d)

Graphite

86.

-Methane is a major constituent of

a)

CNG

b)

Bio-gas

c)

Natural Gas

d)

All the above

87.

Covalent bonds

a)

has low melting and boiling point

b)

are generally poor conductors of electricity

c)

has weak inter-molecular forces

d)

All of the above

88.

Atomic No. of Carbon,No. of Electron,No. of Proton,No of electron is

a)

12

b)

7

c)

6

d)

4

89.

Benzene Formula is

a)

C6H12

b)

C6H8

c)

C8H6

d)

C6H6

90.

Allotrope of carbon and their state are

a)

Graphite,Hydrogen/Solid and Liquid

b)

Diamond and Graphite/Amorphous and Liquid

c)

Graphite and Diamond/Crysalline and Amorphous

d)

Diamond and Graphite/Amorphous and Chlorised

91.

General formula of Alkane is

a)

CnH2n+4

b)

CnH2n+2

c)

CnH2n

d)

CnH2n-2

92.

Prefix But is used when no. of carbon are

a)

1

b)

3

c)

4

d)

5

93.

Which formula represents a saturated hydrocarbon?

a)

A

b)

B

c)

C

d)

D

94.
If an alkane has 20 carbon atoms, how many hydrogen atoms will it have?
a)
20
b)
22
c)
40
d)
42
95.

In which of the following compounds, — OH is the functional group?

a)

Butanone

b)

Butanal

c)

Butanoic acid

d)

Butanol

96.

1. Which one is the correct structure of the given carbon compounds?

2-Chloro-3,4-Di-Methyl-Hexan-2-ol

a)
b)
97.

Prefix 'prop' is used when no. of carbon are

a)

1

b)

3

c)

4

d)

5

98.
The molecular formula for Heptane is
a)
C4H10
b)
C8H18
c)
C5H12
d)
C7H16
99.

Hydrocarbon is an organic compound containing only

a)

carbon and oxygen

b)

hydrogen dan carbon

c)

hydrogen and oxygen

d)

oxygen and nitrogen

100.

Covalent compound

a)

has low melting and boiling point

b)

is generally poor conductors of electricity

c)

has weak inter-molecular forces

d)

All of the above

101.

Buckministerfullerance found in

a)

combined state

b)

free state

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