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प्रश्न
Is Decomposition of calcium carbonate an endothermic reaction or an exothermic reaction?
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उत्तर
Decomposition of calcium carbonate: Endothermic reaction
Decomposition of calcium carbonate is an endothermic reaction because it needs energy to decompose into carbon dioxide and calcium oxide.
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संबंधित प्रश्न
Give one example of a chemical reaction.
Balance the given equation:
HNO3 + Ca(OH)2 
Ca(NO3)2 + H2O
Fill in the following blank with suitable word:
Chemical equations are balanced to satisfy the law of ............
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are reactants.
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Give one example of a chemical reaction characterised by formation of a precipitate.
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\[\ce{Zn + HCl -> ZnCl2 + H2}\]
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C + H2SO4 → CO2 + H2O + SO2
Choose the correct answer from the options given below.
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\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
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| (b) Orange coloured compound changes to green. | (ii) Iodine |
| (c) Red compound changes to brown and then yellow. | (iii) Zinc Nitrate |
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| (e) Violet solid changes to violet vapours. | (v) Red Lead |
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Representation of the results of a chemical change – is a chemical equation.
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Fe + H2O ⇌ Fe3O4 + H2
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2H2O + 2Cl2 → 2HCl + O2
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- displacement reaction
- combination reaction
- redox reaction
- neutralisation reaction
