Asked/Added Questions From NCERT:


Question 1. Asked on :11 February 2019:09:34:51 AM

 what do you mean by borax ?


-Added by Himanshi Verma Science » Chemistry

Answer:

Himanshi Verma

 Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. Powdered borax is white, consisting of soft colorless crystals that dissolve easily in water. Borax has a wide variety of uses.

-Answered by Himanshi Verma On 11 February 2019:05:42:09 PM


Question 2. Asked on :11 February 2019:09:30:54 AM

 why do we need to classify elements ?


-Added by Himanshi Verma Science » Chemistry

Answer:

Himanshi Verma

 The number of elements discovered has increased, making it difficult to remember the behavior and properties of these elements. Hence it is important to classify elements according to their properties. ... It helps us understand how different elements form different compounds.

-Answered by Himanshi Verma On 11 February 2019:05:42:36 PM


Question 3. Asked on :27 January 2019:11:20:09 AM

 find the very reactive  metals? 


-Added by SURAJ KUMAR Science » Chemistry

Answer:

Himanshi Verma

 Francium is the high reactive metal.

-Answered by Himanshi Verma On 02 February 2019:01:42:40 PM


Question 4. Asked on :27 January 2019:11:11:38 AM

 find the atomic number and valancy of potasium

-Added by kunal kumar Science » Chemistry

Answer:

Himanshi Verma

 Atomic number is 19 and valency is 1

-Answered by Himanshi Verma On 02 February 2019:01:44:01 PM


Question 5. Asked on :27 January 2019:11:02:35 AM

 write the formula of bleching power.

-Added by SURAJ KUMAR Science » Chemistry

Answer:

Nitish kumar

 Ca(ClO)2

-Answered by Nitish kumar On 27 January 2019:03:13:16 PM


Question 6. Asked on :27 January 2019:10:27:57 AM

 write the equation of endothermic and exothermic reaction ?

-Added by praful kumar Science » Chemistry

Answer:

Himanshi Verma

 Endothermic reaction examples equations

Endothermic vs. exothermic reactions
  • The teacher replies: “That's because you were given two different salts. ...
  • Consider the reaction mixture—salt plus water—as the system and the flask as the surrounding.
  • 1) Photosynthesis: Plants absorb heat energy from sunlight to convert carbon dioxide and water into glucose and oxygen.

-Answered by Himanshi Verma On 02 February 2019:01:48:05 PM


Question 7. Asked on :16 January 2019:06:16:06 PM

 Which of the following subtances undergo sublimation on heating 

a) Iodine     b) Napthelene             c) Camphor 

-Added by Himanshi Verma Science » Chemistry

Answer:

praful kumar

 The subtances which undergo sublimation on heating is napthelene and camphor.

-Answered by praful kumar On 20 January 2019:10:07:53 AM


Question 8. Asked on :14 January 2019:09:16:13 AM

 Write the chemical formula of Sodium bicarbonate


-Added by Akki chauhan Science » Chemistry

Answer:

Akki chauhan

  NaHCO3

-Answered by Akki chauhan On 15 January 2019:09:50:05 AM


 

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