Question

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Write a short note about decomposition reaction and its types​

Answer 1

• ᴀ ᴅᴇᴄᴏᴍᴘᴏꜱɪᴛɪᴏɴ ʀᴇᴀᴄᴛɪᴏɴ ᴏᴄᴄᴜʀꜱ ᴡʜᴇɴ ᴏɴᴇ ʀᴇᴀᴄᴛᴀɴᴛ ʙʀᴇᴀᴋꜱ ᴅᴏᴡɴ ɪɴᴛᴏ ᴛᴡᴏ ᴏʀ ᴍᴏʀᴇ ᴘʀᴏᴅᴜᴄᴛꜱ. ᴛʜɪꜱ ᴄᴀɴ ʙᴇ ʀᴇᴘʀᴇꜱᴇɴᴛᴇᴅ ʙʏ ᴛʜᴇ ɢᴇɴᴇʀᴀʟ ᴇQᴜᴀᴛɪᴏɴ: ᴀʙ → ᴀ + ʙ. ᴇxᴀᴍᴘʟᴇꜱ ᴏꜰ ᴅᴇᴄᴏᴍᴘᴏꜱɪᴛɪᴏɴ ʀᴇᴀᴄᴛɪᴏɴꜱ ɪɴᴄʟᴜᴅᴇ ᴛʜᴇ ʙʀᴇᴀᴋᴅᴏᴡɴ ᴏꜰ ʜʏᴅʀᴏɢᴇɴ ᴘᴇʀᴏxɪᴅᴇ ᴛᴏ ᴡᴀᴛᴇʀ ᴀɴᴅ ᴏxʏɢᴇɴ, ᴀɴᴅ ᴛʜᴇ ʙʀᴇᴀᴋᴅᴏᴡɴ ᴏꜰ ᴡᴀᴛᴇʀ ᴛᴏ ʜʏᴅʀᴏɢᴇɴ ᴀɴᴅ ᴏxʏɢᴇɴ.

Answer 2

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Decomposition reactions are opposite of combination reactions. In a decomposition reaction, a single substance decomposes to give two or more substances. For example,decomposition of calcium carbonate to calcium oxide and carbon dioxide on heating is an important decomposition reaction used in various industries.

On the basis of how reactant is decomposed, decomposition reaction are of three types;

• Thermal decomposition reaction: When a single reactant breaks down to give simpler products with help of heat it is called thermal decomposition reaction. For example,When calcium carbonate is heated it decomposes to form calcium oxide and carbon dioxide. The reaction can be written as;

$CaCO_3(s) →CaO(s)+Co_2(g)$

• Electrolytic decomposition reaction: When a single reactant breaks down to give simple products with help of electricity it is called electrolytic decomposition reaction. For example, when water breaks down into hydrogen and oxygen with help of electricity,its said to be an electrolytic decomposition reaction. The reaction can be written as:

$2H_2O → H_2+O_2$

• Photoelectric decomposition reaction: When a single reactant breaks down to get simple products, breaking down with help of sunlight, it is called photoelectric decomposition reaction. For example, when white silver chloride turns grey in sunlight, forming silver and chlorine. The reaction can be written as:

$2AgCl(s)→2Ag(s)+Cl_2$

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