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X - Chemical Reactions and Equations

Total questions: 43

Worksheet time: 1hrs 5mins

Name
Class
Date
1.

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

2.
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)
3.

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

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

4.

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

5.

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

6.

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

7.

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

8.

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

9.

Chemical formula of quick lime is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

10.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

11.

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

12.

A redox reaction is one in which :

a)

Both the substance are reduced

b)

Both the substance are oxidized

c)

An acid is neutralized by the base

d)

One substance is oxidized while the other is reduced

13.

Which of the following does not corrode when exposed to the atmosphere-

a)

Fe

b)

Cu

c)

Au

d)

Mg

14.

In the following equation:

Na2CO3 + xHCI -> 2NaCI +CO2 + H2O, the value of x is

a)

1

b)

2

c)

3

d)

4

15.

7.The equation

Cu + xHNO3 -> Cu(NO3)2 + yNO2 + 2H2O

The values of x and y are

a)

3 and 5

b)

8 and 6

c)

4 and 2

d)

7 and 1

16.

3.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

17.

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

a)

1:1

b)

2:1

c)

4:1

d)

1:2

18.

What are the products of decomposition of PbCO3

a)

PbO + CO2

b)

Pb + CO2 + O2

c)

PbO + C

d)

Pb + C + O2

19.

When dil. sulphuric acid is added to pieces of iron sulphie, hydrogen sulphide gas is produced and soluble ferrous sulphate is produced. The type of chemical reaction involved is :

a)

Decomposition reaction

b)

Combination reaction

c)

Displacement Reaction

d)

Double displacement reaction

20.

When ethane reacts with oxygen present in air it produces CO2 and water. In this reaction how many moles of oxygen is used?

a)

3

b)

5/2

c)

2

d)

7/2

21.

A powdered salt X was heated in a dry test tube and evolution of brown fumes of nitrogen dioxide and a yellow residue of lead oxide is formed. The salt X is :

a)

Magnesium Carbonate

b)

Lead nitrate

c)

Ammonium Sulphate

d)

Calcium carbonate

22.

Which of the following processes involve chemical reactions

a)

Storing of oxygen gas under pressure in a gas cylinder

b)

Liquification of air

c)

Keeping petrol in a china dish in open

d)

Heating copper wire in the presence of air at high temperature

23.

Which of the following is not a chemical reaction ?

a)

Formation of salt solution

b)

Milk turns sour in hot weather

c)

Burning of match stick

d)

Contamination of food

24.

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

25.

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

26.

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

27.
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
28.
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)
29.

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.

30.

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

31.

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

32.

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

33.

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

34.

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

35.

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

36.

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

37.

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

38.

H2+O2  =  H2OH_2+O_2\ \ =\ \ H_2O  Is an example of which reaction?

a)

Decomposition

b)

Double displacement

c)

Dispalcement

d)

Combination

39.

A solution of substance ‘X’ is used for whitewashing. Which among the following is the correct formula of ‘X’?

a)

Ca (OH)2

b)

Zn (OH)2

c)

Mg (OH)2

d)

NaOH

40.

What happens when dilute hydrochloric acid is added to iron fillings? Select correct option.

a)

Hydrogen gas and iron chloride are produced

b)

Chlorine gas and iron hydroxide are produced

c)

No reaction takes place

d)

) Iron salt and water are produced

41.

Magnesium burns with air to produce?

a)

Pop sound

b)

Dazzling white flame

c)

Golden flame

d)

Apple green flame

42.

What type of salt is Barium sulphate?

a)

Soluble salt

b)

Insoluble salt

c)

Double salt

d)

Complex salt

43.

Which of the following is correct with respect to oxidation reaction?

a)

Gain of electrons

b)

Gain of oxygen atom

c)

Gain of hydrogen atom

d)

loss of oxygen atom

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