Case Study Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations provided below is very helpful to understand the new format of Board Exams. Case Study Questions for class 10 Chemistry is a very trustable source for practice. Class 10 Science Chapter 1 Case Study Questions is provided to you by NCERT HUB.
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Case Study Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations
1. Read the following and answer the questions from 1.1 to 1.5 :
Amit took a lime solution and passed a gas ‘X’ through it. The solution becomes turgid. This solution was then divided into two parts. In the first part, more of gas ‘X’ was passed. While in the second part concentrated sulphuric acid was added. A white precipitate was formed in second part.
1.1) The gas mentioned in above passage is :
(a) O₂
(b) H₃S
(c) CO₂
(d) H₂Answer
1.2) Lime water and chlorine reacts to form :
(a) CaCl₂
(b) CaOCl₂
(c) CaO
(d) CaCOAnswer
1.3) A solution of a substance X is used for white washing. Identify X :
(a) CaO
(b) Ca(OH)₂
(c) CaCO₃
(d) CO₂
Answer
1.4) Ca(HCO₃) is :
(a) insoluble in water
(b) soluble in water
(c) partially soluble in water
(d) partially insoluble in waterAnswer
1.5) Lime water turns milky in the reaction due to the :
(a) oxygen gas is evolved
(b) formation of calcium bicarbonate
(c) CO₂ gas is evolved
(d) formation of calcium carbonateAnswer
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2. Read the following and answer the questions from 2.1 to 2.5 :
In decomposition reactions, a single reactant breaks down to form two or more products. Decomposition reaction is opposite to combination reaction. Thermal decomposition reactions use the energy in form of heat for decomposition of reactants. Electrolytic decomposition reactions involve the use of electrical energy for the decomposition of reactant molecules. Photolysis or or photochemical decomposition involves the use of light energy for the purpose of decomposition.
2.1) Which of the following reactions is a decomposition reaction ?
(a) NaOH + HCl → NaCl + H₂O
(b) NH₄CNO → H₂NCONH₂
(c) 2KClO₃ → 2KCl + 3O₂
(d) H₂ + I₂ → 2HIAnswer
2.2) 2Pb(NO3 )2 → 2PbO + nA + O₂. What is nA in the given reaction ?
(a) NO₂
(b) 2PbNO₂
(c) 4NO₂
(d) 4NOAnswer
2.3) Amino acid is formed by the decomposition of which component of our diet ?
(a) Fat
(b) Protein
(c) Starch
(d) CarbohydrateAnswer
2.4) Silver chloride on exposure 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. The correct statement(s) is / are :
(a) Only (iv)
(b) Only (i) and (iii)
(c) Only (ii) and (iii)
(d) Only (i) and (ii)Answer
2.5) What type of chemical reaction takes place when electricity is passed through water ?
(a) Displacement reaction
(b) Photochemical decomposition
(c) Electrolytic decomposition
(d) Thermal decompositionAnswer
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3. Read the following and answer the questions from 3.1 to 3.5 :
Redox reactions are those reactions in which oxidation and reduction occur simultaneously. A redox reaction is made up of two half reactions. In the first half reaction, Oxidation takes place and in second half reaction, reduction occurs. Oxidation is a process in which a substance loses electrons and in reduction, a substance hydrogen to a substance and removal of oxygen from a substance.
The substance which gives oxygen to another substance or removes hydrogen from another substance in an oxidation reaction is known as oxidising agent, while the substance which gives hydrogen to another substance or removes oxygen from another substance in a reduction reaction is known as reducing agent.
3.1) Which of the following is a redox reaction?
(a) CaCO₃ → CaO + CO₂
(b) CaO + 2HCl → CaCl₂ + H₂O
(c) H₂ + Cl₂ → 2HCl
(d) NaOH + HCl → NaCl + H₂OAnswer
3.2) Identify the reaction in which H₂O₂ is acting as a reducing agent.
(a) Cl₂ + H₂O₂ → 2HCl + O₂
(b) 2FeCl₂ + 2HCl + H₂O₂ → 2FeCl₃ + 2H₂O
(c) H₂SO₃ + H₂O₂ → H₂SO₄ + H₂O
(d) 2HI + H₂O₂ → 2H₂O + I₂Answer
3.3) For the following reaction, identify the correct statement.
ZnO + CO → Zn + CO₂
(a) CO₂ is being oxidised.
(b) ZnO is being reduced.
(c) ZnO is being oxidised.
(d) CO is being reduced.Answer
3.4) In the following reaction, which substance is reduced ?
PbS + 4H₂O₂ → PbSO₄ + 4H₂O
(a) PbSO₄
(b) PbS
(c) H₂O
(d) H₂O₂Answer
3.5) For the following reactions, identify the one in which H₂S acts as a reducing agent .
(a) CuSO₄ + H₂S → CuS + H₂SO₄
(b) Cd(NO₃)₂ + H₂S → CdS + 2HNO₃
(c) 2FeCl₃ + H₂S → 2FeCl₂ + 2HCl + S
(d) None of theseAnswer
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4. Read the following and answer the questions from 4.1 to 4.5 :
In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features. These features which take place as a result of chemical reaction are known as characteristics of chemical reactions. Some important characteristics of chemical reactions are : evolution of heat, change in colour, change in temperature etc.
4.1) Reaction of magnesium with air is :
(a) exothermic reaction
(b) substitution reaction
(c) endothermic reaction
(d) reversible reactionAnswer
4.2) Which law is satisfied by a balanced chemical equation ?
(a) Law of multiple proportions
(b) Law of constant proportions
(c) Law of conservation of mass
(d) Law of conservation of chemicalAnswer
4.3) Which one of the following processes involve chemical reactions ?
(a) Storing of Oxygen gas under pressure in a gas cylinder
(b) Liquefication of air
(c) Keeping petrol in china dish in the open
(d) Heating copper wire in the presence of air at high temperatureAnswer
4.4) In which of the following reactions, high amount of heat energy will be evolved ?
(a) Electrolysis of water
(b) Burning of LPG
(c) Decomposition of AgBr in the presence of light
(d) Dissolution of NH₄Cl in waterAnswer
4.5) What type of chemical reaction takes place when electricity is passed through water ?
(a) Thermal decomposition
(b) Photochemical decomposition
(c) Water decomposition
(d) Electrolytic decompositionAnswer
5. Read the following and answer the questions from 5.1 to 5.5 :
You must have observed that iron articles are shiny when they are new, but get coated with a reddish brown powder when left for sometime. This process is commonly known as rusting of iron. Some other metals also get tarnished in the same manner. When a metal is attacked by substances around it such as moisture, its said to corrode and this process is called corrosion. The black coating on silver and the green coating on copper are some examples of corrosion.
5.1) Chemically rust is :
(a) hydrated ferrous oxide
(b) hydrated ferric oxide
(c) only ferric oxide
(d) None of theseAnswer
5.2) Rusting of iron involves a chemical reaction which is a combination of :
(a) Oxidation as well as combination reactions
(b) Reduction as well as displacement reactions
(c) Oxidation as well as displacement reactions
(d) Reduction as well as combination reactionsAnswer
5.3) Rusting of iron takes place in :
(a) ordinary water
(b) distilled water
(c) Both (a) and (b)
(d) None of theseAnswer
5.4) Silver articles turns black when kept in the open for a few days due to formation of :
(a) Ag₂S
(b) H₂S
(c) AgS
(d) AgSO₄Answer
5.5) Copper objects lose their shine and form green coating of :
(a) copper oxide
(b) copper carbonate
(c) basic copper carbonate
(d) copper hydroxide and copper oxideAnswer
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