Asked/Added Questions From NCERT:

-Answered by Shruti Srivastva On 24 August 2020:05:11:33 PM

-Answered by Shruti Srivastva On 24 August 2020:05:12:06 PM

(i)Growth of a plant. 

(ii)Rusting of iron.

(iii)Cooking of food.

(iv)Digestion of food.

(v)Burning of candle.

-Answered by Nishant Verma On 25 May 2020:12:49:33 PM

Element: Sodium, Silver, Tin and silicon.

Compounds: Calcium Carbonate, Methane and C0_2. 

Mixtures: Soil, Sugar, Coal, Air, Soap and blood.

-Answered by Nishant Verma On 25 May 2020:12:33:08 PM

-Answered by Shruti Srivastva On 24 August 2020:05:13:01 PM

Sea water, air and soda water. 

-Answered by Shruti Srivastva On 24 August 2020:05:13:36 PM

(i) Ice          

(ii) Iron.        

(iii) Hydrochloric acid.        

(iv) Calcium oxide.      

(v) Mercury.

-Answered by Nishant Verma On 25 May 2020:09:19:22 AM

 Take a sample of colourless liquid and put on stove if it starts boiling exactly at 100° C then it is pure water.

-Answered by Nishant Verma On 25 May 2020:09:17:31 AM

 Homogenoeus Mixture - Soda, water, air, vinegar, filterated tea.

Hetrogeneous Mixture - Wood, soil, air.

-Answered by Nishant Verma On 25 May 2020:09:14:40 AM

 (i) Melting of butter in a pan is a physical changes.

(ii) Rusting of almirah is a physical changes.

(iii) dissolving to common salt in water is a physical changes.

(iv) Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases is a chemical change s.

-Answered by Nishant Verma On 25 May 2020:08:56:40 AM

 The Crystallisation method is used to purify. 

-Answered by Nishant Verma On 25 May 2020:08:55:41 AM

(a) Homogenoeus mixture 

 (i) The mixture with has uniform composition and it's composition cann't be itendified separately is known as Homogenoeus mixture.

(ii) For example - sugar in water, salt in sulphur, water in alcohol etc.

(b) Hetrogeneous mixture

 (i) The mixture which has non - uniform  composition can be identified separately is known as hetrogeneous mixtures.

(ii) For example - sand and salt, sugar and salt, water in oil and etc.

-Answered by Nishant Verma On 25 May 2020:08:44:07 AM

 A material that is composed of only one type of particles is called pure substance. All the constituent particles of a pure substances have same chemical nature.

-Answered by Nishant Verma On 25 May 2020:08:31:26 AM

 First, water is taken has a solvent in a saucer pan. This water solvent is allowed to boil. During heating milk and tea leaves are added to the solvent in solutes. They perform a solution. Then the solution is powered through a strainer. The insoluble part of the solution remains on the strainer of residue. Suger added to the filterate, which dissolves in the filterate. The resulting solution is the required tea.

-Answered by Nishant Verma On 24 May 2020:08:49:48 PM

-Answered by Shruti Srivastva On 24 August 2020:05:15:54 PM

 Chromatography.

-Answered by Nishant Verma On 24 May 2020:10:02:42 PM

 Filtration.

-Answered by Nishant Verma On 24 May 2020:10:03:19 PM

 Sublimation.

-Answered by Nishant Verma On 24 May 2020:10:03:53 PM

-Answered by Harshita Rathore On 26 August 2019:03:06:24 PM

-Answered by Harshita Rathore On 26 August 2019:03:06:43 PM

-Answered by Harshita Rathore On 26 August 2019:03:07:26 PM

-Answered by priyanshu kumar On 20 October 2019:04:02:23 PM

-Answered by priyanshu kumar On 20 October 2019:04:04:03 PM

-Answered by priyanshu kumar On 20 October 2019:04:04:11 PM

 Drawing is the amount of money or value of goods which the proprietor or partner withdraws for personal use. for example, withdrawal of cash by the proprietor for personal use

-Answered by Master Purushottam On 21 August 2019:11:07:50 PM

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

 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

 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.

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

-Answered by Master Purushottam On 24 August 2019:04:54:39 PM

 Zero

-Answered by Master Purushottam On 21 August 2019:03:38:17 PM

-Answered by Master Purushottam On 24 August 2019:04:54:58 PM

-Answered by Master Purushottam On 24 August 2019:04:55:06 PM

1. Indifference curve are downward sloping.

2. Higher indifference curves are preferred to lower ones.

3. Indifference curves do not intersect.

4. Indifference curves are convex.

-Answered by Master Purushottam On 24 August 2019:04:55:21 PM

 Coating of a thin layer of zinc on  metal surface by electroplating is called galvanisation. 

-Answered by Himanshi Verma On 20 August 2019:07:59:48 PM

 Budget set is a set of all possible combination of the two goods which a consumer can afford, given his income prices in the market.

-Answered by Master Purushottam On 20 August 2019:07:41:54 PM

  Ordinal utility is the utility expressed in ranks.

-Answered by Akki chauhan On 21 September 2019:07:40:35 PM

 Marginal utility is the additional utility derived from consumption of one more unit of a commodity.

-Answered by Master Purushottam On 24 August 2019:04:58:08 PM

-Answered by Master Purushottam On 24 August 2019:04:58:16 PM

 Silicon dioxide.

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

 This is because colloids have suspension of small particles, from 1 – 1000 nanometres in size which can scatter light falling on them, a phenomenon called asTyndall effect. In the above question, only b) milk and d) starch solution show Tyndall effect as they are colloids

-Answered by Himanshi Verma On 08 March 2019:05:18:28 PM