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Answered on 10/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

How is boron obtained from borax? Give chemical equations with reaction conditions. read more
How is boron obtained from borax? Give chemical equations with reaction conditions. read less

Abhishek Gupta

So , borax is how to obtained. When high temperature conc. HCL is added to borax (Na2B4O7.10H2O) soluble H3BO3 Which is reduced. Na2B4O7(anhydrous) +2HCL(hot) - 2NaCl + H2B4O7 H2B4O7+5H2O - 4H3BO3 2H3BO3 - B2O3+ 3H2O(stonglst heated) B2O3+6K- 2B+3K2O In other way we can consider Mg,Na .so, B2O3+6Na... read more

So , borax is how to obtained.

When high temperature conc. HCL is added to borax (Na2B4O7.10H2O) soluble H3BO3 Which is reduced.

Na2B4O7(anhydrous) +2HCL(hot)  - 2NaCl + H2B4O7

H2B4O7+5H2O -   4H3BO3

2H3BO3  -  B2O3+ 3H2O(stonglst heated)

B2O3+6K- 2B+3K2O 

In other way we can consider  Mg,Na .so,

B2O3+6Na - 2B+3NaO

Same same Mg then  2B and 3MgO formed.

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Answered on 10/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Silicon carbide (SiC) is known as (a) quartz (b) tridynite (c) corundum (d) carborundum read more
Silicon carbide (SiC) is known as
(a) quartz (b) tridynite (c) corundum (d) carborundum read less

Mihira Nagandla

Chemistry Faculty

SiC is 'carborundum' Quartz is silica,SiO2 Corundum is crystalline alumina , Al2O3
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Answered on 09/12/2018 CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements CBSE/Class 11/Science/Chemistry

Silicones are a group of organosilicon polymers containing (a) Si – O – Si linkages (b)... read more
Silicones are a group of organosilicon polymers containing
(a) Si – O – Si linkages (b) O – Si – O linkages
(c) Si – C – Si linkages (d) Si – Si – O linkages read less

Purnima

Chemistry Expert

(a)
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Asked on 12/11/2018 CBSE/Class 12/Science/Chemistry

When 2g of benzoic acid is dissolved in 25 g of benzene, the experimentally determined molar mass is... read more

When 2g of benzoic acid is dissolved in 25 g of benzene, the experimentally
determined molar mass is always greater than the true value.

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Asked on 16/07/2018 CBSE/Class 12/Science/Chemistry

How to contact directly with students?

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Answered on 08/04/2018 CBSE/Class 12/Science CBSE/Class 12/Science/Chemistry Organic Chemistry

What is one of the most appropriate Chemistry Study Books for Class XII ?

Somnath Chowdhury

Chemistry Tutor

KL Chugh is good book for beginers. Adter that JD lee for inorganic, R K Gupta for organic and Willey publication physical chemistry for JEE will be appropriate.
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Answered on 02/02/2018 CBSE/Class 12/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

Sujoy D.

Tutor

This one is a famous named reaction called Wurtz reaction. Sodium metal makes way for the formation of carbanion by taking advantage of the leaving ability chlorine. Once the carbanion is produced, it dimerizes to form butane.
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Answered on 10/01/2018 CBSE/Class 12/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

Differentiate between adsorbtion and absorption.

Richa Subhash

Tutor

Adsorption occurs only on the surface of the adsorbing material whereas absorption is a bulk process and occurs in the bulk of the material.
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Answered on 10/02/2018 CBSE/Class 12/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

Write the name of two monosaccharides obtained on hydrolysis of lactose sugar.

Sahithi

Chemistry Tutor

The monosaccharides obtained on hydrolysis Of lactose sugar are D-glucose and D-galactose
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