Chemistry: Chemical Reaction And Equation Questions!
There are two changes that can be observed when we mix substances together and this is either physical or chemical changes. A chemical reaction involves the rearrangement of the molecular structure of a substance. Test out your understanding of chemical reactions by taking up the quiz below. All the best and come back for more quizzes like these to aid in your revision.
- 1.
What are the coefficients of the correctly balanced equations? ----Fe2O3 + ----CO ----Fe + ---CO2
- A.
0,2,2,3
- B.
1,3,2,3
- C.
1,2,2,2
- D.
2,6,4,3
Correct Answer
B. 1,3,2,3Explanation
The coefficients of the correctly balanced equation are 1, 3, 2, and 3. This means that in order to balance the equation, we need 1 molecule of Fe2O3, 3 molecules of CO, 2 molecules of Fe, and 3 molecules of CO2.Rate this question:
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- 2.
CaO- calcium Oxide reaction with water is regarded as exothermic. A student mixes these two products in a test tube and touches its side surface. Which of the following statement correctly describes the student’s observation?
- A.
The test tube becomes cold due to release of heat energy
- B.
The test tube becomes hot due to release of heat energy
- C.
The test tube becomes hot due to absorption of heat energy
- D.
The test tube becomes cold due to absorption of heat energy
Correct Answer
B. The test tube becomes hot due to release of heat energyExplanation
When calcium oxide (CaO) reacts with water, it undergoes an exothermic reaction, meaning that heat energy is released. When the student mixes these two products in a test tube and touches its side surface, they would observe that the test tube becomes hot. This is because the heat energy released during the exothermic reaction is transferred to the test tube, causing it to increase in temperature.Rate this question:
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- 3.
Which one is a double displacement reaction?
- A.
BaCl2 + Na2SO4Â Â --------> BaSO4 + 2NaCl
- B.
CaO + H2O ------------> Ca(OH)2
- C.
2Pb(NO3)2 Â Â Â Â Â Â Â Â Â --------> 2PbO + 4NO2 + O2
- D.
Zn + 2AgNO3Â Â Â Â Â ----------> Zn(NO3)2 + 2Ag
Correct Answer
A. BaCl2 + Na2SO4Â Â --------> BaSO4 + 2NaClExplanation
The reaction BaCl2 + Na2SO4 -> BaSO4 + 2NaCl is a double displacement reaction because the cations and anions in the reactants exchange places to form new compounds. Ba2+ from BaCl2 combines with SO42- from Na2SO4 to form BaSO4, and Na+ from Na2SO4 combines with Cl- from BaCl2 to form NaCl. This type of reaction is also known as a precipitation reaction because one of the products, BaSO4, is insoluble and forms a precipitate.Rate this question:
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- 4.
Which of the following are exothermic processes-
- Reaction of water with quick lime
- Dilution of an acid
- Evaporation of water
- Sublimation of camphor crystals
- A.
(i) and (ii)
- B.
(ii) and (iii)
- C.
(i) and (iv)
- D.
(iii) and (iv)
Correct Answer
A. (i) and (ii)Explanation
The reaction of water with quick lime is exothermic because it releases heat energy. This is because the reaction between water and quick lime is highly exothermic and produces calcium hydroxide as a product. Dilution of an acid is also exothermic because it releases heat energy. When an acid is diluted with water, it releases heat due to the exothermic nature of the reaction. Therefore, both (i) and (ii) are exothermic processes.Rate this question:
- 5.
Zinc + Sulphuric acid → Zinc sulphate + (X) What will be the product “X”?
- A.
Hydrogen
- B.
ZnO
- C.
Zinc Sulphite
- D.
Nitrogen
Correct Answer
A. HydrogenExplanation
When zinc reacts with sulphuric acid, it displaces hydrogen from the acid to form zinc sulphate and hydrogen gas. Therefore, the product "X" in this reaction will be hydrogen.Rate this question:
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- 6.
Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) → 2Pb(s) + CO2 (g) i. Lead is getting reduced. ii. Carbon dioxide is getting oxidized. iii. Carbon is getting oxidized. iv. Lead oxide is getting reduced.
- A.
(i) and (ii)
- B.
(i) and (iii)
- C.
(i), (ii) and (iii)
- D.
(iv) only
Correct Answer
A. (i) and (ii)Explanation
In the given reaction, lead oxide (PbO) is being reduced to lead (Pb) and carbon (C) is being oxidized to carbon dioxide (CO2). Therefore, statement (i) is correct as lead is indeed getting reduced. Similarly, statement (ii) is correct as carbon dioxide is indeed getting oxidized. Therefore, the correct answer is (i) and (ii).Rate this question:
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- 7.
Which of the following is not a balanced equation?
- A.
H2 + O2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â H2O
![Chemistry: Chemical Reaction And Equation Questions! - Quiz]()
- B.
Mg + CuSO2 Â Â Â Â Â Â MgSO4 + Cu
![Chemistry: Chemical Reaction And Equation Questions! - Quiz]()
- C.
NaOH + HCl     NaCI + H2O
![Chemistry: Chemical Reaction And Equation Questions! - Quiz]()
- D.
Zn + SÂ Â Â Â Â Â Â Â Â Â Â Â Â Â ZnS
![Chemistry: Chemical Reaction And Equation Questions! - Quiz]()
Correct Answer
A. H2 + O2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â H2O -
- 8.
Aluminum reacts with copper sulphate to produce
- A.
Cu and Al2(SO4)3
- B.
CuO and Al2(SO4)3
- C.
Cu, Al2S3 and SO2
- D.
CuO, Al2S3 and SO2
Correct Answer
A. Cu and Al2(SO4)3Explanation
When aluminum reacts with copper sulphate, the copper ions in the copper sulphate solution are reduced to copper metal, while the aluminum is oxidized to form aluminum sulfate (Al2(SO4)3). Therefore, the products of the reaction are Cu and Al2(SO4)3.Rate this question:
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- 9.
What happens when dilute HCl is added to iron filings? Tick the correct answer.
- 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.
Correct Answer
A. Hydrogen gas and iron chloride are produced.Explanation
When dilute HCl is added to iron filings, a chemical reaction occurs. The HCl (hydrochloric acid) reacts with the iron (Fe) to form iron chloride (FeCl2) and hydrogen gas (H2). This is a typical example of a metal-acid reaction, where the metal displaces the hydrogen in the acid, resulting in the formation of a salt (iron chloride) and the evolution of hydrogen gas.Rate this question:
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- 10.
Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed ? i. It is an endothermic reaction ii. It is an exothermic reaction iii. The pH of the resulting solution will be more than seven iv. The pH of the resulting solution will be less than seven
- A.
(i) and (ii)
- B.
(ii) and (iii)
- C.
(i) and (iv)
- D.
(iii) and (iv)
Correct Answer
B. (ii) and (iii)Explanation
The slaking of lime, which is the reaction between solid calcium oxide and water, is an exothermic reaction because heat is liberated during the process. This means that it releases energy in the form of heat. Additionally, the resulting solution, calcium hydroxide or lime water, will have a pH higher than seven. This indicates that it is alkaline or basic in nature. Therefore, the correct answer is (ii) and (iii).Rate this question:
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- 11.
Which among the following are endothermic processes? i. Reaction of quick lime with water ii. Dilution acid with water iii. Evaporation of water iv. Sublimation of solid ammonium chloride
- A.
(i) and (ii)
- B.
(ii) and (iii)
- C.
(i) and (iv)
- D.
(iii) and (iv)
Correct Answer
D. (iii) and (iv) -
- 12.
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium choloride. Which of the following correctly represents the type of the reaction involve? i. Displacement reaction ii. Precipitation reaction iii. Combination reaction iv. Double displacement reaction
- A.
(i) , (iii)
- B.
(ii), (iii)
- C.
(iii)
- D.
(ii), (iv)
Correct Answer
D. (ii), (iv)Explanation
The given reaction involves the formation of a solid precipitate (barium sulphate) and the exchange of ions between the reactants (barium chloride and ammonium sulphate). This type of reaction is known as a precipitation reaction. Additionally, since the ions from both reactants switch partners to form new compounds, it can also be classified as a double displacement reaction. Therefore, the correct answer is (ii), (iv).Rate this question:
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- 13.
A dilute ferrous sulpahte solution was gradually added to the beaker containing acidified KMnO4 solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
- A.
KMnO4 is oxidizing agent, it oxidizes FeSO4
- B.
FeSO4 acts as an oxidizing agent and oxidizes KMnO4
- C.
The color disappears due to dilution: no reaction is involved
- D.
KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colorless compound.
Correct Answer
A. KMnO4 is oxidizing agent, it oxidizes FeSO4Explanation
KMnO4 is a strong oxidizing agent and can oxidize FeSO4. The light purple color of KMnO4 solution is due to the presence of MnO4- ions, which are reduced to Mn2+ ions during the oxidation reaction. As FeSO4 is oxidized, it loses its ability to produce the light purple color, resulting in the fading and disappearance of the color of the solution.Rate this question:
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- 14.
Which of the following reactions is used in which washing of walls?
- A.
2Ca+O2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2CaO
![Chemistry: Chemical Reaction And Equation Questions! - Quiz]()
- B.
Ca(OH)2 heat        CaO+ H2O
![Chemistry: Chemical Reaction And Equation Questions! - Quiz]()
- C.
Ca(OH)+CO2Â Â Â CaCO3+H2O
![Chemistry: Chemical Reaction And Equation Questions! - Quiz]()
- D.
CaO+H2OÂ Â Â Â Â Â Â Â Ca(OH)2
![Chemistry: Chemical Reaction And Equation Questions! - Quiz]()
Correct Answer
C. Ca(OH)+CO2Â Â Â CaCO3+H2OExplanation
This reaction is used in the washing of walls to remove carbon dioxide (CO2) from the air and form calcium carbonate (CaCO3) and water (H2O).Rate this question:
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- 15.
The electrolytic decomposition of water gives H2 and O2 in the ration of
- A.
1:2 by volume
- B.
2:1 by volume
- C.
8:1 by mass
- D.
1:2 by mass
Correct Answer
B. 2:1 by volumeExplanation
The electrolytic decomposition of water produces hydrogen and oxygen gases. According to Avogadro's law, equal volumes of gases at the same temperature and pressure contain an equal number of molecules. Since the molecular formula of water is H2O, it means that for every molecule of water decomposed, two molecules of hydrogen gas (H2) and one molecule of oxygen gas (O2) are produced. Therefore, the ratio of hydrogen to oxygen gases produced by volume is 2:1.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Oct 30, 2013Quiz Created by
Tanmay Shankar
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