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Why are decomposition reaction called the opposite of combination reaction? Write equation for these

Posted by Darsh Patel 5 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Niharika Jorwal 5 years, 4 months ago

In a decomposition reaction , a single substance break down into two or more substance while in a combination reaction , two or more substance react to produce one substance . Therefore , decomposition reaction are called opposite of combination reactions. Example of decomposition reaction - NH4Cl --> HCl + NH3 Example of combination reaction - CaO + Co2 --> CaCO3

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Gaurav Seth 5 years, 4 months ago

In a combination reaction two or more substances are combined to form new substance while in the decomposition reaction one substance decomposes into two or more substances. Hence, the decomposition reactions are called opposite of combination reactions.

Decomposition reaction <i>CaCO₃ (s) ⇨ CaO (s) + CO₂ (g)</i>

Combination reaction <i>H₂ (g) + Cl₂ ⇨ 2HCl (g)</i>

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