In this article, you will be able to get MCQ questions for Class 10 Science Chemistry Chapter 1 Chemical Reaction and Equations. These MCQs are prepared on the basis of CBSE syllabus for Class 10 Science for Academic session 2021-22. You will find all activities solutions with explanations which will be very helpful for you.
As you all know in the First Term exam,
all questions will be Multiple Choice Questions so given questions will be very
helpful to you.
MCQ Questions for Class 10 Science Chemistry Chapter 1
Chemical Reactions and Equations
Correct answers with Explanation are also
given so that you can better understand the basic concept of questions.
For detailed and thorough study you can
also check NCERT Solution of Class 10 Science Chapter 1 Chemical Reactions and
Equations.
The students can download MCQ Questions
for Class 10 Science Chemistry Chapter 1in PDF format from the link given
below.
Multiple
Choice Questions
Put (√) mark against correct answer:
1. Mg+O2→MgO is a
(a) Skeletal equation
(b)balanced chemical equation
(c)Word equation
(d)all the above
Correct answer – (a)
Explanation-
In the above reaction atoms of reactants and products are not balanced at both
left and right side so it is called a skeletal equation.
2.The balanced
chemical equation in the following is
(a) 2Fe+3H2O→Fe2O3+H2
(b) 2Fe+H2O→Fe2O3+H2
(c) 2Fe+3H2O→Fe2O3+3H2
(d) 2Fe+H2O→Fe2O3+3H2
Correct answer – (c)
Explanation- in the option (c ) No. of atoms of reactants
and products are balanced so this is the correct answer.
3.Symbol (↑)is used to
represent
(a) Aqueous state
(b) gaseous state
(c) Liquid state
(d) Solid state
Correct answer – (b)
Explanation- all gases go upward so an up-arrow (↑) is
used to represent a gaseous state.
4. Burning of coal is a / an
(a) Exothermic reaction
(b) Oxidation reaction
(c) Combination reaction
(d) All the above
Correct answer – (d)
Explanation- In the above reaction, heat is produced so
it is an exothermic reaction. Coal ( C) combines with Oxygen so it is an
oxidation reaction and combination
reaction.
5. KClO3→2KCl +3O2 is a
(a) Isomerization reaction
(b)Displacement reaction
(c)Combination reaction
(d)Decomposition reaction
Correct answer – (d)
Explanation- In the above reaction, KCl3
breaks down into KCl and O2 in the presence of Heat so it is a decomposition reaction.
6.2H2 + O2→2H2Ois a
(a) Isomerization reaction
(b) Displacement reaction
(c) Combination reaction
(d)Decomposition reaction
Correct answer – (c)
Explanation- In the above reaction, Hydrogen combines
with Oxygen to produce water so it is a combination reaction.
7.2Fe+3H2O→Fe2O3+3H2.↑ is a
(a) Combination equation
(b) Decomposition reaction
(c) Isomerization reaction
(d) Displacement reaction
Correct answer – (d)
Explanation- In the above reaction, Fe displaces Hydrogen
from water and forms Fe2O3.
8. Metal more reactive than
copper is
(a) Fe
(b) Zn
(c) Pb
(d) All the above
Correct answer – (d)
Explanation- According to the reactivity series Fe, Zn, Pb
are more reactive than copper.
9. When zinc pieces are
added to dilute sulphuric acid, a.................... reaction takes place.
(a) Displacement
(b) Double displacement
(c) Decomposition
(d)Combination
Correct answer – (a)
Explanation-
10. When barium chloride is
added to sodium sulphate solution, a reaction takes place.
(a) Displacement
(b)Double displacement
(c) Combination
(d)Decomposition
Correct answer – (b)
11. The reaction in which
heat is absorbed is called
(a) Isomerization reaction
(b) Endothermic reaction
(c) isothermic reaction
(d) Exothermic reaction
Correct answer – (b)
Explanation- In endothermic reaction heat is absorbed
during a chemical reaction.
12. The reaction in which
heat is produced is called
(a) isomerisation reaction
(b) Endothermic reaction
(c) Isothermic reaction
(d)Exothermic reaction
Correct answer – (d)
Explanation- In the exothermic reaction, heat is liberated.
13. For decomposition
reaction, energy is required in the form of
(a) Heat
(b)Light
(c) Electricity
(d)All the above
Correct answer – (d)
Explanation
– In the decomposition reaction energy is required and heat, light and
electricity are the forms of energy.
14. A reaction in which a
substance combines with oxygen, is called as
(a) Endothermic reaction
(b) Exothermic reaction
(c) Oxidation reaction
(d) Reduction reaction
Correct answer – (c)
Explanation
– when Oxygen is added to a substance, it is called an oxidation reaction.
15. A reaction in which a
substance combine with hydrogen is called as
(a) Endothermic reaction
(b)Exothermic reaction
(c)Oxidation reaction
(d)Reduction reaction
Correct answer – (d)
Explanation
– When a substance combines with hydrogen, it receives electron and gets
reduced.
16.On passing a gas, lime
water becomes milky, the passed gas is
(a) Argon
(b) Carbon monoxide
(c) Carbon
dioxide
(d) Hydrogen
Correct answer – (c)
17. Rancidity occurs when
fats and oils are
(a) Oxidation reaction
(b) Reduction reaction
(c) Decomposition
reaction
(d) Displacement reaction
Correct answer – (d)
Explanation
– Fats and oils react with atmospheric
oxygen, they become rancid and it is an Oxidation reaction.
18.The example of a physical
change is
(a)milk is left at room
temperature is summers
(b)an iron tawa is heated
(c)iron tawa is left exposed
to humid air
(d)food is cooked
Correct answer – (b)
Explanation
– because on heating iron tawa or other
iron articles are heated, there is no chemical change occurs so it an example
of physical change.
19.Which of the following is
a double displacement reaction
(a) C+O2 →CO2
(b)CuSO4 +Fe →FeSO4
+Cu
(c) CH4 +2O2
→CO2 +2H2O
(d) Na2SO4+baCl2
→BasO4+2NaCl
Correct answer – (d)
20.Which of the following is / are exothermic processes
(i) Sublimation of ammonium chloride
(ii) Quick lime is added to water
(iii) Evaporation of water
(iv) Dilution of an acid
(a) (i) and (ii)
(b) (ii)
and (iii)
(c) (iii) and (iv)
(d) (ii)
and (iv)
Correct answer – (d)
Explanation
– when quick lime is added to water,
heat is produced and heat is also liberated when acid is diluted.
21.Fe2O3 + 2Al →Al2O3+2Fe is a
(i) Combination reaction
(ii) displacement reaction
(iii) redox reaction
(iv) double displacement reaction
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d)(ii)
and (iv)
Correct answer – (b)
22. Silver bromide, on
exposure to sunlight turns grey due to
(a) Formation of silver by its decomposition
(b) Oxidation of silver
bromide
(c) Sublimation of silver
bromide
(d) Decomposition of bromine
gas from silver bromide
Correct answer – (a)
Explanation
– when Silver bromide (AgBr) is kept in sunlight, it gets decomposed into
silver and bromine
Sunlight
AgBr
→Ag +Br
23.Water on electrolysis
decomposes to hydrogen and oxygen. The mole ratio of hydrogen and oxygen is
(a) 1:2
(b) 1:1
(c) 2:1
(d) 4:1
Correct answer – (c)
24.A dilute ferrous sulphate
solution is added to acidified permanganate solution. The light purple colour
of the solution fades and finally disappears. It is due to
(a) KMnO4 is an oxidising agent and oxidation of FeSO4
occurs
(b) Colour appears due to
dilution and no reaction takes place
(c) FeSO4 acts as an oxidising
agent
(d) KMnO4 is an
unstable compound and decomposes to a colourless compound.
Correct answer – (a)
25. Which of the following
is (are) an endothermic reaction (s)
(a) Sublimation of camphor
(b) Evaporation of water
(c) Condensation of water
vapour
(d) Dilution of acid
Correct answer – (a)
26. Which of the following
gases can be used for storage of fresh sample of an oil for a long time
(a) Nitrogen and oxygen
(b) CO2 and
helium
(c) CO2 and
oxygen
(d) Nitrogen and helium
Correct answer – (d)
Explanation
– Nitrogen and Helium both are inactive gases so they stop the Oxidation
process of any foodstuff containing oil.
27.100 mL of water was taken
in beakers A, B and C. A small amount of CuSO4, NaOH and NaCI were added to beakers A, B and C
respectively. The temperature of beakers A and B increased where in beaker C
decreases. The correct statement (s) is / are
(i) In beaker C exothermic process has occurred
(ii) In beakers A and B,
exothermic process has occurred
(iii) In beakers A and B
endothermic process has occurred
(iv) In beaker C endothermic
process has occurred
(a) (i) and (ii)
(b)(ii) and (iii)
(c) (iii) and (iv)
(d)(ii)
and (iv)
Correct answer – (d)
28. Chemical formula of rust
is
(a) Fe2O3
(b) FeCO3
(c) Fe2O3.xH2O
(d)FeCO3.xH2O
Correct answer – (c)
29. For rusting of iron, the
essential requirement is
(a) Air
(b) Water
(c) Open
surface of metal
(d) All the above
Correct answer – (d)
30. Rusting is a / an
(a) Oxidation reaction
(b) Reduction reaction
(c) Decomposed
(d)None of the above
Correct answer – (a)
Explanation- During the rusting, iron combines with atmospheric oxygen so it
an oxidation reaction.
31.A student while heating
solid lead nitrate taken in a test tube would observe
(a). Yellow residue of PbO
(b) White residue of PbO2
(c) Green residue of NO2
(d) Brown residue of NO
Correct answer – (d)
32.Chemical changes
are…………………
(a) Always accompanied with
exchange of light
(b) Temporary,
reversible and a new substance is
produced
(c ) Permanent, irreversible and a new
substance is produced
(d) Never accompanied with
exchange of light and heat energy
Correct answer – (c)
33.Magnesium + Oxygen
→Magnesium oxide is an example of
(a) Double displacement
reaction
(b) Simple displacement
reaction
(c) Combination reaction
(d) Decomposition reaction
Correct answer – (c)
34.Which of the following
will be required to identify the gas evolved when dilute hydrochloride acid
reacts with Zinc metal
(a) red litmus
(b) blue litmus
(c) a burning splinter
(d) lime water
Correct answer – ( c)
Explanation
– In the above reaction Hydrogen gas evolves and it is an inflammable gas so with
the help of a burning splinter, it can be identified.
35. Which among the following
is not a physical change?
(a) Liquification of gases
into liquids
(b) Vaporization of liquids
into gases
(c) Melting of solids to
liquids
(d) Decay of matter
Correct answer – (d)
Explanation
– After the decay of matter, new substances are formed and it is an irreversible
process so it is not a physical change.
36. Breaking of lead bromide
into lead and bromine is an example of …….
(a) Displacement reaction
(b) Decomposition reaction
(c) Combination reaction
(d) Neutralization reaction
Correct answer – (b)
37. NaCl +AgNO3→AgCl+ NaNO3 is
an example of ……
(a) Decomposition reaction
(b) Double displacement
reaction
(c) Combination reaction
(d) Displacement reaction
Correct answer- (a)
38.The main cause of rancidity in food
items is…..
(a) Antioxidants
(b) Oxidation of the fats present in food
items
(c) Bacteria
(d) Proteins present in the food items
Correct answer- (b)
39.Rancidity can be prevented by
(a) Storing food away from light
(b) Adding antioxidants
(c) Keeping food in refrigerator
(d) All of these
Correct answer- (d)
40. what is the chemical name of slaked
lime?
(a) Calcium oxide
(b) Calcium Hydroxide
(c) Calcium dioxide
(d) Carbon mono oxide
Correct answer- (b)
Watch the Video for MCQ Explanation
Class 10 science chapter 1 fill in the blanks
Here you are provided with Important Class
10 Science Chapter 1 fill in
the blanks which are also very useful in the context of a new pattern of CBSE
Class Board Exams 2021-22. You can prepare Multiple Choice Questions using the following fill in the blanks yourself.
Chemical Reaction and Equations fill in the blanks
1. When an atom or group of atoms
displaces the other atom or group of atoms, reaction is called......................................
reaction.
2. In a skeletal equation, number of atoms
is not......................................
3. Combination with ......................................,
is called an oxidation reaction.
4. When magnesium ribbon burns in air, it forms......................................
5. Presentation of word equation using
formulae of substances is a...................................... equation.
6.In a chemical reaction new
...................................... are formed rearranging the existing
atoms.
7.Reaction between calcium oxide and
water is a ...................................... reaction.
8.When one substance changes into two or
more substances, the reaction is ......................................
reaction.
9.In a balanced equation number of atoms
of each element is ...................................... on both the sides.
10.A skeleton chemical equation is
...................................... chemical equation.
11. Symbol (aq) shows
...................................... state of the substance.
12. Reaction of quick lime with water is a
...................................... reaction.
13. Decomposition reactions require energy
either in the form of heat, ...................................... or
electricity.
14. When a nail is dipped in a copper
sulphate solution, ...................................... of copper takes
place.
15. In displacement reaction ......................................
active element displaces the other element.
16. Digestion of food is a
...................................... reaction.
17. Heating of limestone is a
...................................... reaction.
18. Silver bromide decomposes in ......................................
19. Combustion of fuels is an
....................................... reaction.
20. Rust is mainly
.......................................
21. When fats and oils are
......................................., they become rancid.
22. At home food items are placed in a refrigerator to prevent their .......................................
23.Mutual exchange of ions takes place in
....................................... reaction.
24.Energy is .......................................
is endothermic reaction.
25.Energy is
....................................... in exothermic reaction.
- MCQ Questions for Class 10 Science Chemistry Chapter 2
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