Why are decomposition reactions called the opposite of combination reactions - Questions Bank

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The question "Why are decomposition reactions called the opposite of combination reactions" is taken from class-10 chapter is Chemical Reactions And Equations Science English-Medium NCERT-Book and related topic is Decomposition Reactions. Why are decomposition reactions called the opposite of combination reactions - Questions Bank is from NCERT Solutions class 10 English-Medium subject Science chapter- Chemical Reactions And Equations Questions bank Students need stored questions answers as questions banks which can be used anytime anywhere as we can't learn so many ncert solutions.


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Why are decomposition reactions called the opposite of combination reactions - Questions Bank


Question Origin:

NCERT-Book ➧ class-10 ➧ Science ➧ English-Medium ➧ Chemical Reactions And Equations ➧ Decomposition Reactions

Question:

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

Source:www.questionsbanks.com Last updated: 2022-10-03 09:54:57


Answer:

In decomposition reactions a compound breaks down to form two or more substances. These reactions require a source of energy to proceed. Thus, they are the exact opposite of combination reactions. In the combination reaction, two or more substances combine to give a new substance with the releasing of energy.

Example of decomposition reaction: 

2H2O(l)  Electrolysis → 2H2(g) + O2(g)

Example of combination reaction : 

2H2(g) + O2(g) → 2H2O(l) + Energy 


See Other Questions on same Topics:

Class: 10 | Subject: Science

Chapter: Chemical Reactions And Equations | Topic: Decomposition Reactions

3 Questions Found on same Topics.

Question:1

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

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Question:2

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

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Question:3

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

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See More Questions - Class: 10

Chapter: Chemical Reactions And Equations (Science English-Medium)

Hey! 17 Questions Found on same Chapter.

Question:1

Why is respiration considered an exothermic reaction? Explain

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Question:2

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

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Question:3

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

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Question:4

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

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Question:5

What do you mean by a precipitation reaction? Explain by giving examples.

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Question:6

Explain oxidation and reduction with examples.

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Question:7

Why do we apply paint on iron articles?

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Question:8

Oil and fat containing food items are flushed with nitrogen. Why?

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Question:9

What is corrosion?

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Question:10

What is rancidity?

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Question:11

What happens when a magnesium ribbon is burnt in presence of Oxygen?

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Question:12

A solution of a substance ‘X’ is used for white washing.

(i)Name the substance ‘X’ and write its formula.

(ii)Write the reaction of the substance ‘X’ named in (i) above with water.

(iii)Write it’s an industrial use.

(iv)Name the substance which chemical formula is same as ‘X’.

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Question:13

Name the reactions which occurs due to the effects of oxidation reaction in everyday life.

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Question:14

Write the methods to prevent iron articles from corrosion.

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Question:15

Define chemical reactions.

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Question:16

What is skeletal equation?

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Question:17

What is the formula of white washing? 

Or 

Write the formula for white washing material.

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Why are decomposition reactions called the opposite of combination reactions - Questions Bank

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Why are decomposition reactions called the opposite of combination reactions - Questions Bank


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