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    Wednesday, August 26, 2026

    Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity

    Decomposition Reactions – Heat, Light and Electricity | Class 10 CBSE
    🧪 Decomposition Reactions: Heat, Light and Electricity
    Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
    ऊष्मा, प्रकाश तथा विद्युत द्वारा होने वाली वियोजन अभिक्रियाओं के समीकरण
    1️⃣ Description / परिचय
    English:

    A decomposition reaction is a reaction in which a single compound breaks down into two or more simpler substances. The decomposition may require energy in the form of:
    🔥 Heat
    ☀️ Light
    ⚡ Electricity
    हिन्दी:

    वियोजन अभिक्रिया वह अभिक्रिया है जिसमें एक यौगिक टूटकर दो या दो से अधिक सरल पदार्थों में बदल जाता है। इस अभिक्रिया के लिए ऊर्जा निम्न रूपों में दी जा सकती है:
    🔥 ऊष्मा
    ☀️ प्रकाश
    ⚡ विद्युत
    AB → A + B
    2️⃣ Attractive Animation — Energy Supplied
    ⚡ Energy → Compound Breaks → Products
    AB
    →
    A
    B
    +
    🔥 Heat    ☀️ Light    ⚡ Electricity
    3️⃣ Three Important Equations / तीन महत्वपूर्ण समीकरण

    🔥 1. Energy supplied as Heat — Thermal Decomposition

    CaCO₃(s) → Δ CaO(s) + CO₂(g)
    English: Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide.

    हिन्दी: Calcium carbonate को गर्म करने पर यह calcium oxide और carbon dioxide में वियोजित हो जाता है।

    ☀️ 2. Energy supplied as Light — Photolytic Decomposition

    2AgCl(s) → sunlight 2Ag(s) + Cl₂(g)
    English: Silver chloride decomposes in the presence of sunlight to form silver and chlorine.

    हिन्दी: Silver chloride सूर्य के प्रकाश की उपस्थिति में silver और chlorine में वियोजित हो जाता है।

    ⚡ 3. Energy supplied as Electricity — Electrolytic Decomposition

    2H₂O(l) → electricity 2H₂(g) + O₂(g)
    English: Water decomposes into hydrogen and oxygen when electric current is passed through it.

    हिन्दी: जल में विद्युत धारा प्रवाहित करने पर यह hydrogen और oxygen में वियोजित हो जाता है।
    4️⃣ Quick Comparison / त्वरित तुलना
    Energy Type Equation
    🔥 Heat Thermal Decomposition CaCO₃ → CaO + CO₂
    ☀️ Light Photolytic Decomposition 2AgCl → 2Ag + Cl₂
    ⚡ Electricity Electrolytic Decomposition 2H₂O → 2H₂ + O₂
    5️⃣ Full Step-by-Step Solution / पूर्ण चरणबद्ध समाधान
    Step 1 — Identify the reaction
    The question asks for decomposition reactions.
    वियोजन अभिक्रिया में एक reactant टूटकर दो या दो से अधिक products देता है।
    AB → A + B
    Step 2 — Heat
    When heat is supplied, the reaction is called thermal decomposition. Example:
    CaCO₃ → CaO + CO₂
    यहाँ Δ heat को दर्शाता है।
    Step 3 — Light
    When light causes decomposition, it is called photolytic decomposition. Example:
    2AgCl → 2Ag + Cl₂
    यहाँ sunlight energy source है।
    Step 4 — Electricity
    When electric current causes decomposition, it is called electrolytic decomposition. Example:
    2H₂O → 2H₂ + O₂
    Step 5 — Final answer
    Therefore:
    🔥 CaCO₃ → CaO + CO₂

    ☀️ 2AgCl → 2Ag + Cl₂

    ⚡ 2H₂O → 2H₂ + O₂
    6️⃣ CBSE Question — Full Answer
    Q. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
    CBSE Board Important
    English Answer:

    The required decomposition reactions are:

    (i) By heat:
    CaCO₃(s) → CaO(s) + CO₂(g)
    (ii) By light:
    2AgCl(s) → 2Ag(s) + Cl₂(g)
    (iii) By electricity:
    2H₂O(l) → 2H₂(g) + O₂(g)

    हिन्दी उत्तर:

    (i) ऊष्मा द्वारा:
    CaCO₃ → CaO + CO₂
    (ii) प्रकाश द्वारा:
    2AgCl → 2Ag + Cl₂
    (iii) विद्युत द्वारा:
    2H₂O → 2H₂ + O₂
    7️⃣ 30 MCQs — CBSE + Foundation + Competitive
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    9️⃣ 2 Marks — 10 Questions with Solutions
    🔟 3 Marks — 10 Questions with Solutions
    1️⃣1️⃣ 4 Marks — 10 Questions with Solutions
    1️⃣2️⃣ 5 Marks — 10 Questions with Solutions
    1️⃣3️⃣ 6 Marks — 10 Questions with Solutions
    1️⃣4️⃣ Final Revision / अंतिम पुनरावृत्ति
    🔥 Heat → Thermal Decomposition
    CaCO₃ → CaO + CO₂
    ☀️ Light → Photolytic Decomposition
    2AgCl → 2Ag + Cl₂
    ⚡ Electricity → Electrolytic Decomposition
    2H₂O → 2H₂ + O₂
    🏆 Exam-Ready Final Answer
    Answer:

    Decomposition reactions in which energy is supplied in different forms are:

    🔥 Heat:
    CaCO₃(s) → CaO(s) + CO₂(g)
    ☀️ Light:
    2AgCl(s) → 2Ag(s) + Cl₂(g)
    ⚡ Electricity:
    2H₂O(l) → 2H₂(g) + O₂(g)

    Hindi: ऊष्मा, प्रकाश तथा विद्युत द्वारा होने वाली वियोजन अभिक्रियाओं के उदाहरण क्रमशः calcium carbonate, silver chloride तथा water के वियोजन हैं।

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