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Asked/Added Questions From NCERT: Chemistry


Answer:

Shruti Srivastva

 Parabolic path.

-Answered by Shruti Srivastva On 11 July 2020:12:33:50 PM


Question 2. Asked on :07 July 2020:04:38:07 PM

 Express parasec in metres?

-Added by Shruti Srivastva Chemistry » Units And Measurements

Answer:

Shruti Srivastva

 1 parasec= 3.08 X 1016m

-Answered by Shruti Srivastva On 07 July 2020:04:38:51 PM


Question 3. Asked on :26 June 2020:07:35:35 AM

Define disease?

-Added by Aman Senapati Chemistry » Why Do We Fall Ill

Answer:

Aman Senapati

 It can be defined as a condition in which normal functioning of the body or its some part or organ is disturbed or deranged.

-Answered by Aman Senapati On 26 June 2020:07:41:00 AM


Question 4. Asked on :26 June 2020:07:24:32 AM

Define Physical,Mental and Social Health?

-Added by Aman Senapati Chemistry » Why Do We Fall Ill

Answer:

Aman Senapati

 Physical Health:- It refers to the normal state of structure and functioning of various body organ.Physical Health can be determined by several medical tests and physical examination.


Mental Health:- It is associated with the mental satisfaction of a person.It maintains a balance and harmony between individual's expectation and achievement.It is difficult to measure


Social Health:- It implies social well being,i.e.,good relation and happiness at home , at working place and with neighbours and friends.Social health is still more difficult to assess.

-Answered by Aman Senapati On 26 June 2020:07:26:31 AM


Question 5. Asked on :24 June 2020:10:20:01 AM

 What is a Immunisation?

-Added by Aman Senapati Chemistry » Why Do We Fall Ill

Answer:

Aman Senapati

 Development of immunity or body resistance against a pathogen through vaccination is called immunisation.

-Answered by Aman Senapati On 24 June 2020:10:20:58 AM


Question 6. Asked on :24 June 2020:08:24:39 AM

 Why are we normally advised to take bland and nourishing food when we are sick ?

-Added by Aman Senapati Chemistry » Why Do We Fall Ill

Answer:

Aman Senapati

 We are advised to take bland and nourishing food when we are sick so as to :-

a)Provide nourishment to body , to recover from weakness.

b)Strength our body's immune system.

-Answered by Aman Senapati On 24 June 2020:08:38:27 AM


Question 7. Asked on :24 June 2020:08:13:37 AM

 State any two condition essential for being free from disease.

-Added by Aman Senapati Chemistry » Why Do We Fall Ill

Answer:

Aman Senapati

 a)Hygienic living conditions and perfect personal hygiene.

 b)Balanced diet, clean drinking water, adequate physical exercise.

-Answered by Aman Senapati On 24 June 2020:08:21:44 AM


Question 8. Asked on :24 June 2020:08:05:52 AM

 State any two condition essential for good health.

-Added by Aman Senapati Chemistry » Why Do We Fall Ill

Answer:

Aman Senapati

 a)Complete physical fitness, i.e.,free from any disease.

 b)Perfect mental and social well-being.

-Answered by Aman Senapati On 24 June 2020:08:19:15 AM


Question 9. Asked on :30 May 2020:09:52:48 AM

 Write a short note on solid state of matter?

-Added by Aman Senapati Chemistry » Chapter 1 Matter In Our Surrounding

Answer:

Master Purushottam

Solid id one of the four fundamental states of matter (the other being liquid, gas and plasma). The atoms in a solid are closed packed together and contain the least amount of kinetic energy. A solid is characterized by structural rigidity and resistance to a force applied to the surface.

  

-Answered by Master Purushottam On 31 May 2020:12:14:13 AM


Question 10. Asked on :30 May 2020:09:51:35 AM

Name the fourth and fifth state of matter?

-Added by Aman Senapati Chemistry » Chapter 1 Matter In Our Surrounding

Answer:

Master Purushottam

 The fourth state of matter is Plasma , Plasma is a hot ionized gas consisting of approximately equal numbers of positively charged ionsand negatively charged electrons. The fifth state of matter is BEC(Bose-Einstein Consensate). 

-Answered by Master Purushottam On 31 May 2020:12:18:00 AM


Question 11. Asked on :30 May 2020:09:49:01 AM

 What are the important characteristics of particles of matter?

-Added by Aman Senapati Chemistry » Chapter 1 Matter In Our Surrounding

Answer:

Master Purushottam

 The particles of matter are very, very small. The particles of matter have space between them. The particles of matter are constantly moving. The particles of matter attracted each other.


-Answered by Master Purushottam On 31 May 2020:12:20:50 AM


Question 12. Asked on :30 May 2020:09:46:33 AM

What is diffusion?

-Added by Aman Senapati Chemistry » Chapter 1 Matter In Our Surrounding

Answer:

Master Purushottam

Intermixing of particles of different matter in spaces between particles is known as Diffusion.  

-Answered by Master Purushottam On 31 May 2020:12:22:55 AM


Question 13. Asked on :30 May 2020:09:42:31 AM

 What is a Brownian Motion?

-Added by Aman Senapati Chemistry » Chapter 1 Matter In Our Surrounding

Answer:

Master Purushottam

 The erratic random movement of microscope particles in a fluid, as a result of continuous bombardment From molecules of the surrounding medium.

   

-Answered by Master Purushottam On 31 May 2020:12:24:35 AM


Question 14. Asked on :27 May 2020:03:16:47 PM

 What is the law of multiple of proportion?

-Added by Himanshi Verma Chemistry » Laws Of Chemical Combination

Answer:

Himanshi Verma

 This law was proposed by Dalton in 1803. According to this law if two elements can combine to form more than one compounds, the masses of one element that combined with a fixed mass of the other element are in the ratio of small whole numbers.

-Answered by Himanshi Verma On 27 May 2020:03:17:53 PM


Question 15. Asked on :27 May 2020:09:42:00 AM

 Define Diffusion?

-Added by Aman Senapati Chemistry » Chapter 1 Matter In Our Surrounding

Answer:

Nishant Verma

 The movement of atoms or morecules for an area of higher concentration to an area of lower Concentration. Some substances like carbon-di-oxide  or oxygen can move across cell membrane from region of high concentration to a region where concentration is low this process is known as diffusion.

-Answered by Nishant Verma On 27 May 2020:09:59:40 AM


Question 16. Asked on :27 May 2020:09:35:25 AM

 Define Cohesive Force?

-Added by Aman Senapati Chemistry » The Mater In Our Surrounding

Answer:

Nishant Verma

 Cohesive ( from Latin cohaesio  "cling or unit"). Or cohesive attraction or cohesive force is the action or property of like molecules to sticking together, being a mutually attrative.

-Answered by Nishant Verma On 27 May 2020:09:40:45 AM


Question 17. Asked on :27 May 2020:09:26:02 AM

 Name all the particulate nature of matter?

-Added by Aman Senapati Chemistry » Chapter 1 Matter In Our Surrounding

Answer:

Aman Senapati

  1. How small are the particles of matter.
  2. The particles of matter have space between them .
  3. The particles of matter attract each other.
  4. The particles of matter are in continuous motion.

-Answered by Aman Senapati On 27 May 2020:09:27:30 AM


Question 18. Asked on :27 May 2020:09:16:41 AM

 How many molecules are having in a drop of water?

-Added by Aman Senapati Chemistry » The Mater In Our Surrounding

Answer:

Aman Senapati

 A drop of water has about 1,00,00,00,00,00,00,00,00,00,000 particles(molecules).

-Answered by Aman Senapati On 27 May 2020:09:19:17 AM


Question 19. Asked on :26 May 2020:07:41:06 AM

 Ancient Indian philosophers considered all forms of matter to be made of five elements.Name that five elements?

-Added by Aman Senapati Chemistry » The Matter In Our Surrounding

Answer:

Aman Senapati

 The five elements are:-

  1. Akasha(sky)
  2. Vayu(air)
  3. Kshiti(earth)
  4. Jal(water)
  5. Pawak(fire)

-Answered by Aman Senapati On 26 May 2020:07:43:31 AM


Question 20. Asked on :26 May 2020:07:39:56 AM

 What is an atom?


-Added by Aman Senapati Chemistry » The Matter In Our Surrounding

Answer:

Aman Senapati

 An Atom is an smallest component of an elements,characterized by a sharing of the chemical properties of the element and a nucleus with neutrons,protons and electrons.

-Answered by Aman Senapati On 26 May 2020:07:46:33 AM


Question 21. Asked on :26 May 2020:07:38:46 AM

 Name the four basic substances from which matter is made?

-Added by Aman Senapati Chemistry » The Matter In Our Surrounding

Answer:

Aman Senapati

  1.  Earth 
  2.  Air 
  3.  Water
  4.  Fire

-Answered by Aman Senapati On 26 May 2020:07:51:13 AM


Question 22. Asked on :26 May 2020:07:36:56 AM

 Who gave the idea that all matter is made up of four basic substances?

-Added by Aman Senapati Chemistry » The Matter In Our Surrounding

Answer:

Aman Senapati

 Greek philosophers Empedocles.

-Answered by Aman Senapati On 26 May 2020:07:52:41 AM


Question 23. Asked on :26 May 2020:07:30:57 AM

 Name the states which cannot be considered matter?

-Added by Aman Senapati Chemistry » The Matter In Our Surrounding

Answer:

Aman Senapati

 The following are not considered matter:-

  1. Types of energy like heat,light etc.
  2. Sensation
  3. Emotions:love,hatred,affection,friendship,etc.
  4. Time

-Answered by Aman Senapati On 26 May 2020:07:56:41 AM


Question 24. Asked on :25 May 2020:07:26:58 PM

 What is a mass?

-Added by Aman Senapati Chemistry » Ch-1

Answer:

Aman Senapati

 Mass is the amount of matter present in an objects.

-Answered by Aman Senapati On 25 May 2020:07:28:04 PM


Question 25. Asked on :25 May 2020:07:22:09 PM

 What is a matter?

-Added by Aman Senapati Chemistry » The Matter In Our Surrounding

Answer:

Aman Senapati
Anything that has mass and occupies space (i.e has volume)is called Matter.

-Answered by Aman Senapati On 25 May 2020:07:24:14 PM


Question 26. Asked on :23 September 2019:08:42:26 PM

 what is full form of DIY

-Added by Akki chauhan Chemistry » Full Forms

Answer:

Suraj Kumar
Do it Yourself

-Answered by Suraj Kumar On 10 November 2019:03:52:38 PM


Question 27. Asked on :13 September 2019:07:09:35 PM

Pappu Karki, the popular Kumaoni folk singer has passed away. He was native of which state?

-Added by Akki chauhan Chemistry » Chemistry

Answer:

priyanshu kumar

 Uttarakhand


-Answered by priyanshu kumar On 03 October 2019:12:34:18 PM


Question 28. Asked on :13 September 2019:07:03:15 PM

Write is not a chemical change ?

-Added by Akki chauhan Chemistry » Chemistry

Answer:

priyanshu kumar
Crystallization of table salt from sea water

-Answered by priyanshu kumar On 03 October 2019:12:34:52 PM


Question 29. Asked on :13 September 2019:07:02:51 PM

 Which one of the following non metals is not a poor conductor of electricity

-Added by Akki chauhan Chemistry » Chemistry

Answer:

priyanshu kumar

 Selenium.


-Answered by priyanshu kumar On 03 October 2019:12:35:01 PM


Question 30. Asked on :02 September 2019:05:17:03 PM

who was the first president of America?

-Added by Nishant Verma Chemistry » Gk

Answer:

priyanshu kumar
George Washington.

-Answered by priyanshu kumar On 20 October 2019:09:51:45 AM


Question 31. Asked on :02 September 2019:12:10:35 PM

  1. Who is the inventor of electricity?

-Added by Nishant Verma Chemistry » Gk,

Answer:

Harshita Rathore
Benjamin Franklin

-Answered by Harshita Rathore On 02 September 2019:01:51:03 PM


Question 32. Asked on :25 August 2019:09:04:23 AM

 What is currency of Bardados?

-Added by Harshita Rathore Chemistry » Gk

Answer:

Shivang Gupta
 Barbadian dollar. 

-Answered by Shivang Gupta On 25 August 2019:02:45:12 PM


Question 33. Asked on :24 August 2019:01:06:41 PM

 Write the capital of kerla? 

-Added by Harshita Rathore Chemistry » Gk

Answer:

Akki chauhan

 Trivantepuram.

-Answered by Akki chauhan On 24 August 2019:02:46:41 PM


Question 34. Asked on :24 August 2019:11:10:03 AM

National game of Bhutan is

-Added by Akki chauhan Chemistry » G.k

Answer:

Akki chauhan

 Archery.

-Answered by Akki chauhan On 24 August 2019:11:11:52 AM


Question 35. Asked on :24 August 2019:09:50:24 AM

Who is Governor of Chhattisgarh.

-Added by Akki chauhan Chemistry » G.K

Answer:

priyanshu kumar

 Berlin.


-Answered by priyanshu kumar On 10 November 2019:03:26:19 PM


Question 36. 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 37. 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 38. 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 39. 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 40. 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 41. 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 42. 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 43. 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 44. 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 45. 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 46. 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 47. 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 48. 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


Answer:

Akki chauhan

 Sulphur

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


Question 50. 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 51. 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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