types of reaction 11

 Here are the exam-ready answers for your CBSE Class 10 Science questions based on Chapter 1: Chemical Reactions and Equations.

Q1. A solution of a substance ‘X’ is used for whitewashing.

(i) Name the substance ‘X’ and write its formula.

✅ The substance ‘X’ is quick lime.
Name: Calcium oxide
Formula: CaO

(ii) Write the reaction of substance ‘X’ with water.

When calcium oxide reacts with water, it forms calcium hydroxide, which is used for whitewashing.

CaO (s)+H2O (l)→Ca(OH)2(aq)+Heat\text{CaO (s)} + \text{H}_2\text{O (l)} \rightarrow \text{Ca(OH)}_2 (aq) + \text{Heat}

✅ This is an exothermic reaction (releases heat).

Q2. Why is the amount of gas collected in one of the test tubes in Activity 1.7 double that of the other? Name this gas.

✅ In Activity 1.7, water is electrolysed to produce two gases:

  • Hydrogen (H₂) at the cathode

  • Oxygen (O₂) at the anode

✅ Answer:
The amount of gas collected in one test tube is double because water (H₂O) breaks down in a 2:1 ratio — 2 parts hydrogen and 1 part oxygen.

Chemical Equation:

2H2O (l)→electricity2H2(g)+O2(g)2\text{H}_2\text{O (l)} \xrightarrow{\text{electricity}} 2\text{H}_2 (g) + \text{O}_2 (g)

✅ Name of the gas collected in double amount:
Hydrogen gas (H₂)

Would you like these questions added to a chapter-end worksheet, formative assessment quiz, or animated class explanation for better concept delivery?

Comments

Post a Comment

Popular posts from this blog

⚡ Electrolytic Decomposition Reaction

Certainly, Mayank! Here's a Class 10–level explanation of Electrolytic Decomposition Reaction , aligned with the CBSE syllabus and written in a clear, engaging, and exam-ready format for your students. ⚡ Electrolytic Decomposition Reaction (From Chapter 1: Chemical Reactions and Equations – Class 10 Science) 🎯 Definition: An electrolytic decomposition reaction is a chemical reaction in which a compound is broken down into simpler substances using electricity . ✅ The process of using electric current to split a compound is called electrolysis . 📘 General Reaction Format: A B → Electricity A + B AB \xrightarrow{\text{Electricity}} A + B 🧪 Example: Electrolysis of Water (As shown in NCERT Activity 1.7) 2 H 2 O (l) → Electricity 2 H 2 ( g ) + O 2 ( g ) 2\text{H}_2\text{O (l)} \xrightarrow{\text{Electricity}} 2\text{H}_2 (g) + \text{O}_2 (g) Water (H₂O) splits into: Hydrogen gas (H₂) → collected at cathode Oxygen gas (O₂) → collected at anode The ...
Read more

🔥 Activity 1.11 – Oxidation and Reduction (Redox Reaction)

 Certainly, Mayank! Here's a CBSE Class 10–aligned explanation of Activity 1.11 , along with an answer to the Recall of Activity 1.1 . The focus is on conceptual clarity, oxidation-reduction (redox) concepts, and exam readiness. 🔥 Activity 1.11 – Oxidation and Reduction (Redox Reaction) (Class 10 Science – Chapter 1: Chemical Reactions and Equations) 🎯 Objective: To demonstrate how a metal (copper) undergoes oxidation and how the product can be reduced using hydrogen gas. 🧪 Materials Required: Copper powder (about 1 gram) China dish Heat source (burner or spirit lamp) Hydrogen gas (for part 2 of the reaction) 🔬 Procedure: Take a small quantity of copper powder in a china dish . Heat the copper gently. Observe any colour change. Now, pass hydrogen gas over the heated copper oxide . 👁️ Observations: Step What Happens Chemical Equation 1. Heating copper Surface turns black due to formation of copper(II) oxide (CuO) 2 Cu...
Read more

🧪 Precipitation Reaction

 Certainly, Mayank! Here's a clear, CBSE-exam–oriented explanation of the Precipitation Reaction for Class 10 Science students, with definitions, examples, and concepts aligned with the NCERT syllabus. 🧪 Precipitation Reaction (Class 10 Science – Chapter 1: Chemical Reactions and Equations) 📘 Definition: A precipitation reaction is a type of chemical reaction in which two aqueous solutions react to form an insoluble solid called a precipitate . ✅ This precipitate appears as a solid that settles at the bottom of the reaction mixture. 🔬 General Form: A B ( a q ) + C D ( a q ) → A D ( s ) ↓ + C B ( a q ) AB (aq) + CD (aq) \rightarrow AD (s) ↓ + CB (aq) AB and CD are aqueous ionic compounds AD is the precipitate (solid) CB remains dissolved in water (aqueous) 🧪 Examples from NCERT / CBSE Class 10: ✅ 1. Barium Chloride + Sodium Sulphate (Activity 1.10) BaCl 2 ( a q ) + Na 2 SO 4 ( a q ) → BaSO 4 ( s ) ↓ + 2 NaCl ( a q ) \text{BaCl}_2 (aq) + \te...
Read more