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Asked/Added Questions From NCERT:


Question 1. Asked on :12 October 2019:10:50:56 AM

Why decomposition reaction are called opposite of combination reaction?

-Added by Himanshi Verma Science » Chemical Reaction And Equation

Answer:

Nishant Verma

In a decomposition reaction, a single substance breaks down into two or more substance while in a combination reaction, two or more substances react to produce one substance. Therefore, decomposition reaction are called opposite of combination reaction.


-Answered by Nishant Verma On 13 October 2019:03:25:26 PM


Question 2. Asked on :07 October 2019:11:52:45 AM

Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why?

-Added by Himanshi Verma Science » Chemical Reaction And Equation

Answer:

Master Purushottam
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid whereas copper does not because it depends on the reactivity of metal to get the hydrogen gas as the product with dilute acid.  But same reaction does not occur with copper metal because copper is less reactive than hydrogen

-Answered by Master Purushottam On 07 October 2019:09:07:55 PM


Question 3. Asked on :07 October 2019:11:51:45 AM

 Why do we store silver chloride in dark coloured bottles?

-Added by Himanshi Verma Science » Chemical Reaction And Equation

Answer:

Master Purushottam
Silver chloride is stored in dark coloured bottles because it reacts with sunlight and decomposes to form silver and chlorine gas. So to prevent this it is stored in dark coloured bottles. the type of reaction is photolytic decomposition reaction

-Answered by Master Purushottam On 07 October 2019:09:08:05 PM


Question 4. Asked on :22 September 2019:07:44:17 PM

What is Rancidity?

-Added by Rohit Rajput Science » Chemical Reaction And Equation

Answer:

priyanshu kumar
The oxidation of fats and oils when exposed to air is known as rancidity. It leads to bad smell and bad taste of food.

-Answered by priyanshu kumar On 02 October 2019:12:33:28 PM


Question 5. Asked on :22 September 2019:07:43:29 PM

What is Decomposition Reaction?

-Added by Rohit Rajput Science » Chemical Reaction And Equation

Answer:

priyanshu kumar
The reaction in which a compound splits into two or more simple substance is called decomposition reaction.

-Answered by priyanshu kumar On 02 October 2019:12:33:41 PM


Question 6. Asked on :22 September 2019:07:41:50 PM

What is Endothermic Reactions?

-Added by Rohit Rajput Science » Chemical Reaction And Equation

Answer:

priyanshu kumar
The reactions which require energy in the form of heat, light or electricity to break reactants are called endothermic reactions.

-Answered by priyanshu kumar On 02 October 2019:12:34:13 PM


Question 7. Asked on :21 September 2019:05:06:03 PM

What is reactants?

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

priyanshu kumar
A substance that takes part in and undergoes change during a reaction.

-Answered by priyanshu kumar On 02 October 2019:12:45:02 PM


Question 8. Asked on :04 September 2019:10:57:38 AM

why should a magnesium ribbon be cleaned before burning in Air?

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

priyanshu kumar
Magnesium ribbon must be cleaned before burning in air so that the the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.

-Answered by priyanshu kumar On 10 October 2019:10:49:59 AM


Question 9. Asked on :02 September 2019:06:51:47 PM

What is respiration? 

-Added by Himanshi Verma Science » Chemical Reaction And Equation

Answer:

Master Purushottam
 The glucose then undergoes slow combustion by combining with oxygen in the cells of our body to produce energy in a process called respiration. In addition to other function this energy maintains our body heat.

-Answered by Master Purushottam On 03 September 2019:03:02:28 PM


Question 10. Asked on :02 September 2019:06:43:32 PM

 What do you understand by exothermic and endothermic reaction?

-Added by Himanshi Verma Science » Chemical Reaction And Equation

Answer:

Master Purushottam

 Exothermic reaction:- The reaction in which heat is evolved is called exothermic reaction.  For ex- C+ O2-----> CO2 + heat


Endothermic reaction:- The reaction in which heat is not evolved and energy is evolved is called endothermic reaction.  For ex- C6H12O2+6O2----> 6CO2+ 6H2O+ Energy.

-Answered by Master Purushottam On 03 September 2019:03:02:38 PM


Question 11. Asked on :02 September 2019:06:38:21 PM

 What  do you mean by chemical equation?

-Added by Himanshi Verma Science » Chemical Reaction And Equation

Answer:

Master Purushottam

 The method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it is known as a chemical equation.

For ex- Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This reaction can be written in words as : 

Zinc+   Sulphuric Acid  ----------> Zinc sulphate +   Hydrogen

-Answered by Master Purushottam On 03 September 2019:03:05:43 PM


Question 12. Asked on :31 August 2019:07:53:44 PM

What is Chemical reaction.

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

Nishant Verma
This process in which new substances with new properties are formed from one or more substances is called Chemical reaction.

-Answered by Nishant Verma On 02 September 2019:11:56:57 AM


Question 13. Asked on :31 August 2019:07:52:52 PM

What is Products?

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

Nishant Verma
The substances which are formed in a chemical reaction are called Products.

-Answered by Nishant Verma On 02 September 2019:11:57:10 AM


Question 14. Asked on :31 August 2019:07:52:05 PM

What is Reactants?

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

Nishant Verma
The substances which take part in chemical reaction are called Reactants.

-Answered by Nishant Verma On 02 September 2019:11:57:32 AM


Question 15. Asked on :31 August 2019:07:38:31 PM

Why is respiration considered an exothermic reaction?

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

Nishant Verma
 Respiration is considered as exothermic reaction because energy is released in this process. Glucose combines with oxygen present in our cells to form carbon dioxide and water along with energy. Respiration is considered as exothermic reaction because energy is produced during this process.

-Answered by Nishant Verma On 02 September 2019:11:57:46 AM


Question 16. Asked on :19 August 2019:08:01:40 PM

 Why does the copper sulphate solution change when iron nail is dipped in it?

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

Himanshi Verma

When an iron nail is dipped in copper sulphate the blue colour of copper solution get change blue to green.

-Answered by Himanshi Verma On 19 August 2019:08:07:05 PM


Question 17. Asked on :19 August 2019:07:59:59 PM

Name a substances used for white washing?

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

Himanshi Verma

 Calcium oxide ( quick lime).

-Answered by Himanshi Verma On 19 August 2019:08:05:26 PM


Question 18. Asked on :19 August 2019:07:54:14 PM

 What is corrosion?

-Added by Akki chauhan Science » Chemical Reaction And Equation

Answer:

Himanshi Verma

 The process in which metals loses their surface or gets corroded gradually by the reaction of air, water, and moisture is called corrosion.

-Answered by Himanshi Verma On 19 August 2019:08:03:16 PM


Question 19. Asked on :18 August 2019:08:51:58 AM

 Why should megnisium ribbon be cleaned before burning in air?

-Added by Khushi Chauhan Science » Chemical Reaction And Equation

Answer:

Himanshi Verma
Magnesium is highly reactive metal . Its surface is turnised due to formation of a thin layer of magnesium oxide with atmospheric oxygen . Hence magnesium ribbon is clean with sand paper before burning it . 

-Answered by Himanshi Verma On 18 August 2019:10:30:19 AM


Question 20. Asked on :19 April 2019:08:29:31 AM

 What is chemical reaction.

-Added by Prince Rawat Science » Chemical Reaction And Equation

Answer:

Sohail alam

 Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

-Answered by Sohail alam On 19 April 2019:03:03:21 PM


 

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