Asked/Added Questions From NCERT: Chemistry

Question 1. Asked on :21 August 2019:05:00:29 PM

What is the common name of POP, and also write its uses?

-Added by Himanshi Verma Chemistry » Ch 2

Answer:

Himanshi Verma
The common name of POP(Plaster of Paris) is Calcium sulphate hemihydrate.

It uses are:-

1. Its used for supporting fractured bones.

2. It is used for making sufaces smooth.

3. It is used in many material and making in toys.

4. It is used for making statues.

-Answered by Himanshi Verma On 21 August 2019:05:15:13 PM

Question 2. Asked on :21 August 2019:04:55:33 PM

Write the formula of washing soda and also write its uses?

-Added by Himanshi Verma Chemistry » Ch 2

Answer:

Himanshi Verma

The formula of washing soda is Na₂Co₃.10H₂o. Recrystallisation of sodium carbonate gives washing soda. It is a basic salt.

Its uses are:-

1. It is used in glass, soap and paper industries.

2. It is used in manufacture of Borax.

3. It is used as cleaning agent for domestic purpose.

4. It is used for removing permanent hardness of water.

-Answered by Himanshi Verma On 21 August 2019:04:56:37 PM

Question 3. Asked on :21 August 2019:04:53:16 PM

What is chlor- alkali reaction?

-Added by Himanshi Verma Chemistry » Ch 2

Answer:

Himanshi Verma

When electricity is passed through an aqueous solution of sodium chloride it decomposes to form sodium hydroxide. The process is called the chlor-alkali alkali process because of the products formed: chlor for chlorine and alkali for Sodium Hydroxide. Chlorine gas is given off at the anode and hydrogen gas at the cathode.

An aqueous solution of sodium chloride is called brine.
2NaCl (aq) + 2H2O(l) ---(electrolysis)---> 2NaOH(aq) + Cl2(g) + H2(g).

-Answered by Himanshi Verma On 21 August 2019:04:54:18 PM

Question 4. Asked on :21 August 2019:04:51:27 PM

Name the acid present in ant sting.

-Added by Himanshi Verma Chemistry » Acid And Base

Answer:

Himanshi Verma

Methanoic acid is present in ant sting.

-Answered by Himanshi Verma On 21 August 2019:04:52:47 PM

Question 5. Asked on :21 August 2019:04:49:16 PM

What is electrovalent compounds?

-Added by Himanshi Verma Chemistry » Ch - 3

Answer:

Himanshi Verma

The compunds formed by the transfer of electrons from a metal to a non- metal are called ionic compounds or electrovalent compounds.

-Answered by Himanshi Verma On 21 August 2019:04:50:17 PM

Question 6. Asked on :21 August 2019:04:46:17 PM

How carbon attain noble gas configuration?

-Added by Himanshi Verma Chemistry » Carbon And Its Compound

Answer:

Himanshi Verma

Carbon has 4 electrons in its outer most orbits and in order to attain the noble gas configuration it should either lose the 4 electrons and gain helium gas configuration or gain 4 electrons to obtain neon gas configuration

But is very difficult for it to gain or lose 4 electrons as very high energy is required to remove 3rd or 4th electrons and also it's very difficult for it to gain 4 electrons and hold it.
Hence carbon atom undergoes covalent bonding with other atoms to become stable.

-Answered by Himanshi Verma On 21 August 2019:04:48:24 PM

Question 7. Asked on :21 August 2019:04:43:17 PM

Write the limitations of Mendeleev's Classification.

-Added by Himanshi Verma Chemistry » Periodic Classification Of Elements

Answer:

Himanshi Verma

1. Position of isotopes could not be explained.

2. No fixed position for hydrogen.

3. Wrong order of atomic masses of some elements could not be explained.

-Answered by Himanshi Verma On 21 August 2019:04:44:39 PM

Question 8. Asked on :21 August 2019:04:32:06 PM

What is Calcination?

-Added by Himanshi Verma Chemistry » CH 3

Answer:

Himanshi Verma

The carbonate ores are changed into oxides by heating strongly in limited air. This process is called Calcination.

-Answered by Himanshi Verma On 21 August 2019:04:32:51 PM

Question 9. Asked on :20 August 2019:07:40:49 PM

What are the limitations of Mendeleev's classification?

-Added by Himanshi Verma Chemistry » Periodic Classification Of Elements

Answer:

Himanshi Verma

1. No, fixed position can be given to hydrogen in the Mendeleev's classification.

2. There are no any place for isotopes.

3. It was not possible to predict how many elements could be discovered between two elements.

-Answered by Himanshi Verma On 20 August 2019:07:44:51 PM

Question 10. Asked on :19 August 2019:10:49:13 PM

What is the chemical name of sand?

-Added by Himanshi Verma Chemistry » Ch 2

Answer:

Himanshi Verma

Silicon dioxide.

-Answered by Himanshi Verma On 19 August 2019:10:56:21 PM

Question 11. Asked on :28 June 2019:03:44:38 PM

Father of is Antoine Lavoisier - source

-Added by Md Sarfaraz Nashtar Chemistry » Who Is Father Of Chemistry?

Answer:

Himanshi Verma

Father of Antoine Lavoisier is "Jean Antoinie Lavoisier".

-Answered by Himanshi Verma On 01 July 2019:07:27:27 PM

Question 12. Asked on :24 January 2019:05:17:44 PM

वह कौन सा विटामिन है जो गर्म होने पर नष्ट हो जाता है ?

-Added by Himanshi Verma Chemistry » G.k

Answer:

Akki chauhan

vitamin C

-Answered by Akki chauhan On 05 February 2019:09:57:59 AM

Question 13. Asked on :23 January 2019:05:12:06 PM

जहरील पधार्थो को क्या कहा जाता है?

-Added by Himanshi Verma Chemistry » G.k

Answer:

Akki chauhan

Toxin

-Answered by Akki chauhan On 05 February 2019:09:57:55 AM

Question 14. Asked on :23 January 2019:04:55:55 PM

वह कौन सी चीज है जो सूखी हो 2 किलो गीली हो तो 1 किलो और जल जाए तो ३ किलो हो जाती है ?

-Added by khushi chauhan Chemistry » G.k

Answer:

Akki chauhan

Sulphur

-Answered by Akki chauhan On 05 February 2019:09:57:50 AM

Question 15. Asked on :14 January 2019:05:43:06 PM

How can we seprate a mixture of salt and Ammonium Chloride?

-Added by Himanshi Verma Chemistry » Is Matter Around Us Pure

Answer:

Master Purushottam
By the process of sublimation

-Answered by Master Purushottam On 24 August 2019:12:02:19 AM

Question 16. Asked on :14 January 2019:09:31:13 AM

World's first Atomic Energy Plant.

-Added by Rohit Rajput Chemistry » First In The World

Answer:

Master Purushottam
In U.S.A

-Answered by Master Purushottam On 23 August 2019:11:50:20 PM

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