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Get complete NCERT Solutions for 10 Science 1. Chemical Reactions and Equations with detailed explanations. Easy-to-understand answers to help students study effectively and score better.
Preparing for exams becomes easier with NCERT Book Solutions . Whether you are studying for board exams or mid-term exams, 10 Science Chapter 1. Chemical Reactions and Equations solutions provide quick revising points, well-structured answers, and additional practice material to help you score better.
ncert_solutionsQ1. Why should a magnesium ribbon be cleaned before burning in air?
Ans: A magnesium ribbon should be cleaned before burning in air so that it may come in the contact of air.
Q2. Write the balanced equation for the following chemical reactions.
(i) Hydrogen + Chlorine → Hydrogen chloride
Sol: H2 + Cl2 → HCl
H2 + Cl2 → 2HCl
(ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride
Sol: BaCl2 + Al2 (SO4)3 → Ba SO4 + AlCl3
3 BaCl2 + Al (SO4)3 → 3Ba SO4 +2 AlCl3
(iii) Sodium + Water → Sodium hydroxide + Hydrogen
Sol: 2Na + H2O → NaOH + H2
2Na + 2H2O → 2NaOH + H2
Q3. Write a balanced chemical equation with state symbols for the following reactions.
(i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
Ans: BaCl2(aq) + Na2 SO4 (aq) → Ba SO4 (s) + NaCl (aq)
(ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
Ans: NaOH(aq) + HCl (aq) → NaCl (aq) + H2O(aq)
Q1. A solution of a substance ‘X’ is used for white washing.
(i) Name the substance ‘X’ and write its formula.
Ans: Name the substance ‘X’ is Calsium Oxide (lime water) and its chemical formula is CaO.
(ii) Write the reaction of the substance ‘X’ named in (i) above with water.
Ans: CaO + H2O → Ca(OH)2
Q2. Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
Ans: During the Electrolysis of water, hydrogen and oxygen is get separated by the electricity. Water (H2O) contains two parts hydrogen and one part oxygen. Since hydrogen goes to one test tube and oxygen goes to another, the amount of gas collected in one of the test tubes is double of the amount collected in the other.
Q1. Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Ans: When an iron nail is dipped in a copper sulphate solution, iron which is more reactive than copper it displaces copper from copper sulphate solution and forms iron sulphate, In this case the blue colour of copper sulphate turns into green, which is colour of iron sulphate.
Equation of this reaction:
CuSO4 + Fe → FeSO4 + Cu
(copper sulphate) (iron) (iron sulphate) (copper)
Q2. Give an example of a double displacement reaction other than the one given in Activity 1.10.
Ans: Sodium carbonate reacts with calcium chloride to form calcium carbonate and sodium chloride.
Na2CO3 + CaCl2 → CaCO3 + 2 NaCl
In this reaction, sodium carbonate and calcium chloride exchange ions to form two new compounds. Hence, it is a double displacement reaction.
Q3. Identify the substances that are oxidised and the substances that are reduced in the following reactions.
(i) 4Na(s) + O2(g) → 2Na2O(s)
(ii) CuO(s) + H2(g) → Cu(s) + H2O(l)
Ans:
(i) Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced.
(ii).Copper oxide (CuO) is reduced to copper (Cu) while hydrogen (H2) gets oxidised to water (H2O).
NCERT Book Solutions are created by experts to give step-by-step explanations. Around 60–70% of exam questions are based on NCERT concepts. Our 10 Science Chapter 1. Chemical Reactions and Equations solutions help you understand the core concepts and practice effectively.
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To boost your preparation, we also provide additional important questions with answers. These are prepared from previous year board papers, sample papers, and important concepts of Chapter 1. Chemical Reactions and Equations. Practicing these ensures you are well-prepared for both board and mid-term exams.
Our NCERT Book Solutions are useful for both board exams and mid-term exams. For 10 Science, we provide notes, exercises, and important Q&A so that you can revise smartly and write perfect answers in exams.
In short, NCERT Book Solutions for 10 Science Chapter 1. Chemical Reactions and Equations are a complete study package. With quick revising points, NCERT exercises, and additional important questions, you can prepare effectively for exams. Make these solutions your study companion and excel in your academic journey.
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