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Class 10 Chemical equations and reaction MCQ (Multiple Choice Questions)

In this page we have chemical reactions and equations class 10 mcq (multiple choice questions).It includes assertion and reason type also. Hope you like them and do not forget to like and share the page.

Question 1.
Which of the following reactions involves the combination of two elements :-
(a)CaO + CO₂ -> CaCO₃
(b)4Na + O₂ -> 2Na₂O
(c)SO₂ +(1/2)O₂ -> SO₃
(d)NH₃ + HCI -> NH₄CI

Question 2.
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphate is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of :-
(a)A combination reaction
(b)A displacement reaction
(c)A decomposition reaction
(d)A double decomposition reaction

Question 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

Question 4.
A student added dilute HCI to a test tube containing zinc granules and made following observations :-
(a)The zinc surface became dull and black
(b)A gas evolved which burnt with a pop sound
(c)The solution remained colorless
(d)The solution becomes green in color.

Question 5.
A dilute solution of sodium carbonate was added to two test tubes one containing dilute HCI (A) and the other containing dilute NaOH (B). the correct observation was :-
(a)A brown colored gas liberated in test tube A
(b)A brown colored gas liberated in test tube B
(c)A colorless gas liberated in test tube A
(d)A colorless gas liberated in test tube B

Question 6.
A balanced chemical equation is in accordance with
(a)Avogadro’s law
(b)Law of multiple proportion
(c)Law of conservation of mass
(d)Law of gaseous volumes

Question 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

Question 8.
Zn + H₂SO₄(dil) ->ZnSO₄ + H₂
Above reaction is
(a)Decomposition reaction
(b)Single displacement reaction
(c)Combination reaction
(d)Synthesis reaction

Question 9.
The reaction in which two compounds exchange their ions to form two new compounds is
(a)A displacement reaction
(b)A decomposition reaction
(c)An isomerization reaction
(d)A double displacement reaction

Question 10.
When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction is
SO₂ + 2H₂S -> 2H₂O + 3S. here hydrogen sulphide is acting as
(a)An oxidizing agent
(b)A reducing agent
(c)A dehydrating agent
(d)A catalyst

Question 11.
CuO + H₂ ->H₂O + Cu, reaction is an example of
(a)Redox reaction
(b)Synthesis reaction
(c)Neutralization
(d)Analysis reaction

Question 12.
A substance which oxidized itself and reduces other is known as
(a)Oxidizing agent
(b)Reducing agent
(c)Both of these
(d)None of these

Question 13.
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

Question 14.
In the following equation:
Na₂CO₃ + xHCI -> 2NaCI +CO₂ + H₂O, the value of x is
(a)1
(b)2
(c)3
(d)4

Question 15.
In the equation, NaOH + HNO₃ -> NaNO₃ + H₂O nitric acid is acting as
(a)An oxidizing agent
(b)An acid
(c)A nitrating agent
(d)A dehydrating agent

Question 16.
Fe₂O₃+ 2AI₂O₃ + 2Fe
The above reaction is an example of a
(a)Combination reaction
(b)Double displacement reaction
(c)Decomposition reaction
(d)Displacement reaction

Question 17.
White silver chloride in sunlight turns to
(a)Grey
(b)Yellow
(c)Remain white
(d)Red

Question 18.
Black and white photography uses
(a)Decomposition of silver chloride
(b)Decomposition of silver bromide
(c)Both
(d)None of these

Question 19.
When copper powder is heated it gets coated with
(a)Black copper oxide
(b)Yellow copper oxide
(c)Red copper oxide
(d)None of these

Question 20.
Combination of phosphorus and oxygen is an example of
(a)Oxidation
(b)Reduction
(c)Rancidity
(d)None of these

Question 21.
Rusting of an iron is an example of
a)Reduction
b)Ionization
c)Oxidation
d)Dissociation

Question 22.
Which of the following does not corrode when exposed to the atmosphere-
(a)Iron
(b)Copper
(c)Gold
(d)Silver
Question 23.
Take about 1.0g CaCO₃ in a test tube. Heat it over a flame, when a colorless gas comes out. The reaction is called a
(a)Decomposition reaction
(b)Displacement reaction
(c)Double decomposition reaction
(d)Double displacement reaction
Question 24.
Hydrogen sulphide (H₂S) is a strong reducing agent. Which of the following reactions shows its reducing action
(a)Cd(NO₃)₂ + H₂S -> CdS + 2HNO₃
(b)CuSO₄ + H₂S -> CuS + H₂SO₄
(c)2FeCl₃ + H₂S -> 2FeCl₂ + 2HCI + S
(d)Pb(NO₃)₂ +H₂S -> PbS + 2CH₃COOH
Question 25.
When P reacts with caustic soda, the products are PH₃ and NaH₂PO₂. This reaction is an example of
(a)Oxidation
(b)Reduction
(c)Oxidation and reduction (redox)
(d)Neutralization

Question 26.
2CuI-> Cu + CuI₂, the reaction is
(a)Redox
(b)Neutralization
(c)Oxidation
(d)Reduction

Question 27.
When copper turning are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because, copper
(a)Displaces silver from the solution
(b)Forms a blue colored complex with AgNO3
(c)Is oxidized to $Cu_2+$
(d)Is reduced to $Cu_2+$

Question 28.
Zn²⁺ (aq) +2e -> Zn(s). this is
(a)Oxidation
(b)Reduction
(c)Redox reaction
(d)None of these
Question 29.
Assertion (A): In a chemical reaction, the total mass of the reactants is always equal to the total mass of the products.
Reason (R): This is because of the law of conservation of mass.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question 30.
Assertion (A): In a displacement reaction, a more reactive element displaces a less reactive element from its compound.
Reason (R): This is because the more reactive element has a higher affinity for the other part of the compound.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question 31.
Assertion (A): In a combination reaction, two or more substances combine to form a single substance.
Reason (R): This is because the substances react with each other to form a new compound.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question 32.
Assertion (A): Rusting of Iron is endothermic in nature.
Reason (R): As the reaction is slow, the release of heat is barely evident.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question 33.
Assertion (A): Silver bromide decomposition is used in black and white photography.
Reason (R): Light provides energy for this exothermic reaction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Answer

1. b) Except (b) all other reactions involve compounds.
2. (d) CuSO₄ +H₂S -> CuS + H₂SO₄
It is a Double decomposition
3.(c) Iron is more reactive than copper, hence Cu will not displace iron from iron sulphate, hence no reaction will take place.
4.(b) Zn + 2HCl -> ZnCl₂ + H₂
5.(c) Na₂CO₃+ 2HCI -> 2NaCI + H₂O + CO₂
6.(c)
7.(c) Cu +4HNO₃ -> Cu(NO₃)₂ + 2NO₂ + 2H₂O
8.(b)
9.(d)
10.(b) Here H₂S is oxidizing in to H₂O, hence behave as a reducing agent.
11.(a)
12.(b)
13.(d)
14. (b) Na₂CO₃ + 2HCI ->2NaCI + CO₂ + H₂O
15.(b) The reaction represents a neutralization reaction in which base (NaOH) reacts with an acid (HNO₃) to form salt (NaNO₃) and water (H₂O).
16.(d)
17.(a) Write silver chloride in sunlight turns to grey.
18.(b)
19.(a) 2Cu + O₂ -> 2CuO
Black
20.(a) 4P + 3O₂ ->2P₂O₃
(Oxidation)
Or 4P + 5O₂ ___ 2P₂O₅
(Oxidation)
21.(c) During rusting iron get oxidized to form rust (Fe₂O₃ x H₂O)
22.(c) Gold is very least reactive hence does not corrode at all.
23.(a)
24.(c)
N the given reaction H2 is undergoing oxidation, hence behave as reducing agent.
25.(c)
It shows oxidation and reduction (redox) properties.
26.(a) Oxidation and reduction both occur so the reaction is redox.
27.(c) Cu is above of Ag in electrochemical series and thus
Cu + 2Ag+-> Cu2+ + 2Ag reaction occurs.
28.(b) reduction.
29.(a)
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. Therefore, the total mass of the reactants will always be equal to the total mass of the products.
30.(a)
Assertion: Displacement reactions involve an element being displaced from a compound by a more reactive element.
Reason: In the reaction Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s), iron displaces copper from copper sulphate solution because it is more reactive.
Explanation: In a displacement reaction, a more reactive element displaces another element from its compound. The given reaction is an example of a displacement reaction where iron displaces copper from copper sulphate solution because it is more reactive.
31.(a)
Assertion: Combination reactions involve two or more substances combining to form a single product.
Reason: In the reaction CaO(s) + H2O(l) → Ca(OH)2(aq), calcium oxide and water combine to form a single product, calcium hydroxide.
Explanation: In a combination reaction, two or more substances combine to form a single product. The given reaction is an example of a combination reaction where calcium oxide and water combine to form a single product, calcium hydroxide.
32.(d)
33.(c)

Summary

This Chemical reactions and equations class 10 mcq (multiple choice questions) is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.

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