Chemical Reactions Class-8th Goyal Brothers ICSE Chemistry Solutions Ch-6(Chemical Reactions) Unit-1(Chemical Reactions). We Provide Step by Step Answers of Objectives, True and False, Incorrect and Correct , Definitions , Match the followings and Short/Long Question Type answers of Ch-6(Chemical Reactions) Unit-1(Chemical Reactions). Visit official Website CISCE for detail information about ICSE Board Class-8
Chemical Reactions Class-8th Goyal Brothers ICSE Chemistry Solutions Ch-6 Unit-1
| Board | ICSE |
| Class | 8th |
| Subject | Chemistry |
| Book Name | Goyal Brothers |
| Chapter-6 | Chemical Reactions |
| Unit-1 |
Chemical Reactions |
| Topic | Solution of exercise questions |
| Session | 2023-24 |
OBJECTIVE TYPE QUESTIONS
Chemical Reactions Class-8th Goyal Brothers ICSE Chemistry Solutions ch-6 unit-1
Que: A. Fill in the blank spaces by choosing the correct words from the list given below :
List : decomposition, neutralisation, combination, precipitation, displacement
1. The reaction between the hydrogen gas and chlorine gas is a chemical combination reaction.
2. The decomposition of mercuric chloride on heating is a chemical decomposition reaction.
3. The reaction between iron and copper sulphate solution is a chemical displacement reaction.
4. The reaction between an acid and a base is called neutralisation reaction.
5. The reaction between sodium carbonate solution and copper sulphate solution is a precipitation reaction.
Que: B. Statements given below are incorrect. Write the correct statements :
Question: 1. Charcoal burns in air with producing a pop sound along with sparkles.
Answer: Charcoal burns in air with producing a crackling sound along with sparkles.
Question: 2. Red lead oxide on heating strongly forms lead dioxide and oxygen.
Answer: Red lead oxide on heating strongly forms lead dioxide and oxygen.
Question: 3. The reaction between magnesium and oxygen is an endothermic reaction.
Answer: The reaction between magnesium and oxygen is an exothermic reaction.
Question: 4. The decomposition of sodium bicarbonate is an example of exothermic reaction.
Answer: The decomposition of sodium bicarbonate is an example of endothermic reaction.
Question: 5. The reaction between an acid and a base is called precipitation reaction.
Answer: The reaction between an acid and a base is called neutralisation reaction.
Que: C. Match the statements in Column A, with those in Column B :
| Column A | Column B |
| 1. An oxide exhibits acidic as well as basic also. | (a) Precipitation reaction |
| 2. Decomposition of copper carbonate on heating to form copper oxide and carbon dioxide. | (b) Displacement reaction |
| 3. The chemical reaction between silver nitrate solution and sodium chloride solution. | (c) Endothermic reaction |
| 4. A reaction in which zinc metal dissolves in dilute sulphuric acid. | (d) Amphoteric |
| 5. A chemical reaction proceeds with the absorption of heat energy. | (e) Decomposition reaction |
Answer:
| Column A | Column B |
| 1. An oxide exhibits acidic as well as basic also. | (a) Amphoteric |
| 2. Decomposition of copper carbonate on heating to form copper oxide and carbon dioxide. | (b) Decomposition reaction |
| 3. The chemical reaction between silver nitrate solution and sodium chloride solution. | (c) Precipitation reaction |
| 4. A reaction in which zinc metal dissolves in dilute sulphuric acid. | (d) Displacement reaction |
| 5. A chemical reaction proceeds with the absorption of heat energy. | (e) Endothermic reaction |
Que: D. Write ‘True’ or ‘False’ for the following statements :
| Statements | True/False |
| 1. When two elements combine to form a single compound, the reaction is said to be chemical combination. | T |
| 2. The reaction between quick lime and water is an endothermic reaction. | F |
| 3. Reaction between magnesium and iron sulphate solution is a chemical. | F |
| 4. All non-metallic oxides are known as acidic oxides. | T |
| 5. Some of the metallic oxides are known as basic oxides. | T |
Que: E. Tick (√) the most appropriate answer :
1. Which reaction represents chemical combination ?
(a) 2NaHCO3 → Na2CO3 + H2O + CO2
(b) CaO + H2O → Ca(OH)2
(c) CuSO4 + Fe → FeSO4 + Cu
(d) AgNO3 + NaCl → AgCl + NaNO3
Answer: option (b) CaO + H2O → Ca(OH)2 is correct.
2. Which reaction does not take place?
(a) FeSO4 + Cu → CuSO4 + Fe
(b) Zn + 2HCl → ZnCl2 + H2
(c) Pb(NO3)2 + Mg → Mg(NO3)2 + Pb
(d) ZnSO4 + Mg → MgSO4 + Zn
Answer: option (a) FeSO4 + Cu → CuSO4 + Fe is correct.
3. The chemical reaction which proceeds with release of heat energy is known as
(a) endothermic
(b) exothermic
(c) either (a) or (b)
(d) none of these
Answer: option (b) exothermic is correct.
4. Which one is not a amphoteric oxide?
(a) Al2O3
(b) ZnO
(c) PbO
(d) Na2O
Answer: option (a) Al2O3 is correct.
5. Which one is not a chemical decomposition reaction ?
(a) 2NaHCO3 → Na2CO3 + H2O + CO2
(b) Zn + 2HCl → ZnCl2 + H2
(c) 2Pb3 O4 → 6PbO + O2
(d) CuCO3 → CuO + CO2
Answer: option (b) Zn + 2HCl → ZnCl2 + H2 is correct.
STUDY QUESTIONS
Chemical Reactions Class-8th Goyal Brothers ICSE Chemistry Solutions ch-6 unit-1
Question:1.Define the term chemical combination reaction. Support your answer by two examples and write fully balanced chemical equations.
Answer: Reactions in which two or more reactants combine to form one product are called Combination reactions. Examples:
1. Mg+O2→2MgO
2. C+O2→CO2
Question: 2. Define the term chemical decomposition reaction. Support your answer by two examples and write fully balanced chemical equations.
Answer: The reaction in which a single compound breaks down into two or more than two elements or new compounds is called decomposition reaction. Examples:
Question: 3. Define the term chemical displacement reaction. Support your answer by two examples and write fully balanced chemical equations.
Answer: A displacement reaction is a type of chemical reaction in which a more reactive metal displaces a less reactive metal from its salt solution. Examples:
1. Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
2. Cu + 2AgNO3 ⟶ Cu(NO3)2 + 2Ag
Question: 4. Define the term chemical double displacement reaction. Support your answer by giving one example of neutralisation reaction and one example of precipitation reaction.
Answer: A double displacement reaction is a type of chemical reaction in which positive and negative radicals of two reactants are exchanged which will lead to the formation of the product.
The neutralization reaction is also a kind of double displacement reaction in which an acid reacts with a base to form salt and water. The product salt contains anion from acid and cation from the base.
Example: Solution of Sodium hydroxide(NaOH) reacts with dilute Hydrochloric acid(HCl) to form the salt Sodium chloride(NaCl)and water.
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
Question: 5. (a) Define exothermic reaction with example.
Answer: The chemical reaction in which the heat is released is known as an Exothermic reaction. Examples are the burning of a candle and the reaction of a strong acid with water.
(b) Define endothermic reaction with example.
Answer: The chemical reaction in which the heat is absorbed is known as an Endothermic reaction. Examples are melting ice cubes and melting solid salts.
Question: 6. (a) By giving examples explain acidic oxide.
Answer: An acidic oxide reacts with water and produces an acid. Usually, it is the oxide of non-metals. Examples include SO2, CO2, SO3, Cl2O7, P2O5, and N2O5.
(b) By giving examples explain basic oxide.
Answer: An oxide that exhibits the property of a base is called a basic oxide. Since they are basic, they react with an acid to form a salt. These oxides are formed by the reaction of Oxygen with metals like Magnesium(Mg), Sodium (Na), etc. Basic oxide reacts with water to form a base as shown in the reaction below. Example of basic oxide: Magnesium oxide (MgO), CaO, K2O, Na2O.
Question: 7. By giving examples explain the terms
(a) Amphoteric oxide
Answer: The oxides which behave as both acidic and basic oxides are called amphoteric oxides. Examples- aluminum oxide (Al2O3), zinc oxide (ZnO).
(b) Neutral oxide
Answer: Neutral oxides shows neither acidic nor basic properties. They do not form salt, when reacted with acid or base. Example, Nitric acid(NO), Carbon monoxide
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