What is tincture of iodine? Write its one use. from Class 12 CBS

Subject

Chemistry

Class

CBSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

51.

Write one difference between α -helix and β -pleated structures of proteins.


52.

Why is bithional added to soap?


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53.

What is tincture of iodine? Write its one use.


  1. Its 2-3 per cent solution of iodine in alcohol-water solution is known as tincture of iodine.
  2. Iodine is a powerful antiseptic.
  3. It is applied to wounds.

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54.

Among the following, which one acts as a food preservative?
Aspartame, Aspirin, Sodium Benzoate, Paracetamol


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55.

Shyam went to a grocery shop to purchase some food items. The shopkeeper packed all the items in polythene bags and gave them to Shyam. But Shyam refused to accept the polythene bags and asked the shopkeeper to pack the items in paper bags. He informed the shopkeeper about the heavy penalty imposed by the government for using polythene bags. The shopkeeper promised that he would use paper bags in future in place of polythene bags.

Answer the following :

(a) Write the values (at least two) shown by Shyam

(b) Write one structural difference between low-density polythene and high-density polythene.

(c) Why did Shyam refuse to accept the items in polythene bags?

(d) What is a biodegradable polymer ? Give an example


56.

Write the reactions involved in the following :

Hofmann bromamide degradation reaction


57.

Write the reactions involved in the following :

Diazotisation


58.

Write the reactions involved in the following :

Gabriel phthalimide synthesis


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59.

Give reasons:
(CH3)2NH is more basic than (CH3)3N in an aqueous solution.


60.

Give reasons:

Aromatic diazonium salts are more stable than aliphatic diazonium salts.


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