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प्रश्न
Explain the following type of chemical reaction, giving two examples for it:
Decomposition reaction
उत्तर
A reaction in which a compound breaks up due to heat application into two or more simple substances is called a decomposition reaction.
\[\ce{AB->[heat] A + B}\]
Examples:
- Mercuric oxide when heated, decomposes to form two elements mercury and oxygen
\[\ce{2HgO_{(s)}->[heat] 2Hg_{(s)} + O2_{(g)}}\] - CaCO3 when heated decomposes to calcium oxide and carbon dioxide.
\[\ce{CaCO3 ->[heat] CaO + CO2}\]
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संबंधित प्रश्न
Rewrite the following statements by selecting the correct options:
\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\] is a __________ reaction.
The white solid compound A decomposes quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained along with potassium nitrate solution. Gas C does not burn itself but helps burn other things.
(a) What is compound A?
(b) What is compound B?
(c) What is gas C?
(d) What do you think is the black substance X? What is its function?
(e) What is the general name of substances like X?
What type of reaction is represented by the following equation?
2 FeSO4 → Fe2 O3 + SO2 + SO3
How will you obtain Nitrogen dioxide from lead nitrate.
Also give balanced equations for the reactions
Answer the following question.
2 g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time. What will be your observation in this case? Write the chemical reaction involved in the form of a balanced chemical equation. Identify the type of chemical reaction.
Differentiate between direct combination reaction and a decomposition reaction.
Complete the statement by filling in the blank with the correct word:
Decomposition of silver salts in the presence of sunlight is an example of _________.
Which of the following is an endothermic process?
- Identify the gasses evolved at the anode and cathode in the above experimental set up.
- Name the process that occurs. Why is it called so?
- Illustrate the reaction of the process with the help of a chemical equation.
A solution of a substance ‘X’ is used for whitewashing.
- Name the substance ‘X’ and write its formula.
- Write the reaction of the substance ‘X’ named in the above formula with water.
