CBSE Class 10 Chemistry Chapter 1 Important Questions: In this article, we are going to discuss the Important questions of CBSE Class 10 Chemistry Chapter 1 Chemical Reactions and Equations for 2023 class 10th board examination. The answers are also given towards the end. Download solutions in PDF.
CBSE Class 10 Chemistry Chapter 1 Important Questions: Central Board of Secondary Education is likely to release the 2023 class 10th board examination date sheet soon. The board has not yet announced a fixed date for the release of the date sheet. Soda Ash Light
The board exams are likely to commence in February, 2023.
With about two months left for CBSE Class 10 Science board examinations, students should begin their preparations if they haven’t already done so.
In this article, we are going to discuss the Important questions of CBSE Class 10 Chemistry Chapter 1 Chemical Reactions and Equations. It is the first chapter in Unit I Chemical Substances - Nature and Behaviour.
Unit I: Chemical Substances - Nature and Behaviour
MnO2 + 4HCl →MnCl2 + 2H2O + Cl2
(a) Zn (NO3)2 + Ag (b) ZnNO3 + Ag (c) AgNO3 + Zn (NO3)2 (d) Ag + Zn (NO3)3
(ii) double displacement reaction
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
DIRECTION: Each of these questions contains an assertion followed by reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.
(a) If both Assertion and Reason are correct and reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
Q1. Assertion (A): Photosynthesis is considered as an endothermic reaction.
Reason (R): Energy gets released in the process of photosynthesis
Q2. Assertion (A): MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O is redox reaction.
Reason (R): MnO2 oxidises HCl to Cl2 and gets reduced to MnCl2.
Q3. Assertion (A): When HCl is added to zinc granules, a chemical reaction occurs.
Reason (R): Evolution of a gas indicates that the chemical reaction is taking place.
Q4. Assertion (A): White silver chloride turns grey in sunlight.
Reason (R): Decomposition of silver chloride in presence of sunlight takes place to form silver metal and chlorine gas.
Q5. Assertion (A): Chemical reaction changes the physical and chemical properties of a substance
Reason (R): Chemical change involves a change in the chemical composition of matter, and a new substance is formed
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These practise papers will not just boost your Chemistry preparation but also help you in analysing what your weak points are.
(i) The massive force that pushes the rocket forward through space is generated due to the
(ii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of
(iii) Which of the following reactions represents a combination reaction?
(a) CaO (s) + H2O (l) → Ca (OH)2 (aq)
(b) CaCO3 (s) → CaO (s) + CO2(g)
(c) Zn(s) + CuSO4 (aq) → ZnSO4 (aq) + Cu(s)
(d) 2FeSO4(s) → Fe2O3 (s) +SO2(g) + SO3(g)
(iv) Complete the following statements by choosing correct type of reaction for X and Y.
Statement 1: The heating of lead nitrate is an example of ‘X’ reaction.
Statement 2: The burning of magnesium is an example of ‘Y’ reaction.
For example, 2NaOH+H2SO4⟶Na2SO4 + 2 H2O
(i) When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained, and the sulphuric acid so formed remains in the solution. The reaction is an example of a
(ii) Barium chloride on reaction with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?
(c) (III) and (IV) only
(d) (II) and ( V) only
(iii) Identify A in the following reaction.
AlCl3(aq) + 3NH4OH(aq)⟶A + 3NH4Cl(aq)
(iv) Consider the following reaction, BaCl2 + Na2SO4⟶ BaSO4 + 2NaCl. Identify the precipitate in the reaction,
(a) Why is this black substance formed?
(b) What is the black substance?
(c) Write the chemical equation of the reaction that takes place.
(d) How can the black coating on the surface be turned reddish brown?
(a) A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction.
(b) Ferrous sulphate when heated, decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.
(i) For a short duration
Also, write the chemical equations for the reaction involved.
(a) Write the name and colour of the compound precipitated.
(b) Write the balanced chemical equation for the reaction involved.
(c) Name the type of this reaction justifying your answer.
(i) CaO + H2O → Ca(OH)2
(ii) 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4
(iii) FeSO4→HeatFe2O3+SO2+SO3
(a) Zinc reacts with silver nitrate to produce zinc nitrate and silver.
(b) Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide.
(a) Fe2O3 + 2Al → Al2O3 + 2Fe
(b) 2PbO + C → 2Pb + CO2
CBSE Class 10 Science Syllabus 2022-23
CBSE Class 10 Science Sample Paper 2022-23
DOWNLOAD: Answers to CBSE Class 10 Chemistry Chapter 1 Important Questions
The massive force that pushes the rocket forward through space is generated due to the decomposition reaction. Hydrogen peroxide decomposes and provides it with a considerable reaction force thrust.
Lead nitrate decomposes to give brown fumes of nitrogen dioxide gas and yellow residue of lead oxide is left behind.
A reaction in which two or more reactants combine to form a single product is known as a combination reaction.
2. A combination reaction is said to have occurred when two or more than two substances combine to form a single substance. CaO + H 2 O → Ca(OH) 2
4. (i) For short duration: Limewater turns milky due to the formation of CaCO3, Which is insoluble in water. CaOH 2 + Co 2 → CaCo 3 + H 2 O
(ii) For Long duration: A clear solution is obtained due to the formation of calcium bicarbonate. Ca (HCO3)2 which is soluble in water. CaCO 3 + H 2 O → Ca(HCO 3 ) 2
5. (a) When lead nitrate is added to potassium iodide then yellow precipitate of lead iodide is formed along with potassium nitrate.
(b) Balanced chemical reaction is as follows : Pb(NO 3 ) 2 + 2KI → PbI 2 + 2KNO 3
(ii) Precipitation reaction or double displacement reaction.
7. When 2 g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time, the white sodium chloride turns grey due to the decomposition reaction through the sunlight that decomposes silver chloride into silver and chlorine by light. 2 AgCl (s) → 2 Ag (s) + Cl 2 (g)
(i) Consider the following displacement reaction: Zn(s)+ CuSO4(aq) → ZnSO4(aq) + Cu(s) Here, Zn has changed into ZnSO4 (i.e., Zn2+ ions) by loss of electrons. Hence, Zn has been oxidised. CuSO4 (i.e., Cu2+) has changed into Cu by gain of electrons. Hence, CuSO4 has been reduced. Thus, the above reaction is a displacement reaction as well as a redox reaction.
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