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CBSE Class 12-science Answered

Why HNO3 makes wool yellow??
Asked by lovemaan5500 | 27 Jan, 2020, 06:43: PM
answered-by-expert Expert Answer
Proteins and amino acids that contain phenyl rings form a yellow colored compound when treated with concentrated nitric acid. The yellow stains on the wool fibres are caused due to the reaction of nitric acid with protein keratin present in the wool fibres. This reaction is called xanthoproteic reaction.
Answered by Ramandeep | 28 Jan, 2020, 10:59: AM

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CBSE 12-science - Chemistry
A polymer sample contains 30%(by weight) of chains with molecular weight 10000, 30%(by weight) of the chains with molecular weight 20000, and the rest of chains with molecular weight 30000. Calculate the number average and weight average molecular weight of the sample.
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CBSE 12-science - Chemistry
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CBSE 12-science - Chemistry
In a polymer sample 30% of molecules have a molecular mass 20,000, 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer? (1) 40,300, (2) 30,600, (3) 43,333, (4) 50,400
Asked by patra04011965 | 14 May, 2019, 07:55: AM
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CBSE 12-science - Chemistry
Write the structures of monomers used to obtain the following polymers: (a) Natural rubber (b) PVC (c) Nylon-6,6
Asked by sanjeet.kumar | 12 Mar, 2019, 02:18: PM
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CBSE 12-science - Chemistry
How are polymers classified on the basis of synthesis?
Asked by Topperlearning User | 22 Jun, 2016, 12:37: PM
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CBSE 12-science - Chemistry
Monomers combine with the loss of a simple molecule in the case of which polymerization reaction?
Asked by Topperlearning User | 22 Jun, 2016, 12:34: PM
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CBSE 12-science - Chemistry
What happens when 'n' number of ethylene molecules are added up?
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CBSE 12-science - Chemistry
How natural polymers differ from synthetic polymer?
Asked by Topperlearning User | 17 Oct, 2014, 09:40: AM
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CBSE 12-science - Chemistry
What is natural rubber?
Asked by Topperlearning User | 23 Jun, 2014, 04:35: PM
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