Aspirin acts as an analgesic because it

1.  inhibits the synthesis of prostaglandins which stimulates inflammation of the tissue
2.  prevents the release of HCl in the stomach
3.  prevents the interaction of histamine with its receptor
4.  inhibit activities of enzymes

62%

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Q62:

Starch is a mixture of two components, a water soluble component amylose (15-20%) and a water insoluble component amylopectin (80-85%). The aqueous solution of amylase gives a blue colour with iodine solution due to the formation of

1.  amylase iodide
2.  amylase iodate
3.  inclusion complex
4.  amylase tetraiodide complex

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Q64:

Aldol condensation between which of the following two compounds followed by dehydration gives methyl vinyl ketone?

1.  Formaldehyde and acetone
2.  Formaldehyde and acetaldehyde
3.  Two molecules of acetone
4.  Two molecules of acetaldehyde

55%

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Q65:

Grignard reagent and organolithium compounds react with dry ice separately. Hydrolysis of the products from these two reactions will give:
1. Ketones and carboxylic acids, respectively.
2. Carboxylic acids and ketones, respectively.
3. Only carboxylic acids
4. Only ketones

Subtopic: Aldehydes & Ketones: Preparation & Properties |

From NCERT

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Q66:

The strongest acid among the following is:

1.  o-Methoxy phenol
2.  p-Methoxy phenol
3.  m-Methoxy phenol
4. Phenol

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Q67:

On commercial scale phenol is obtained from chlorobenzene. The chlorobenzene needed for the purpose is prepared by Rachig’s process. Which one of the following is Rachig’s process?

1.

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Q69:

At 300 K, the 36 g of glucose present per litre of solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of the solution is 1.52 bar at the same temperature, what would be its concentration?

1. 11 g L^-1

2. 22 g L^-1

3. 36 g L^-1

4. 42 g L^-1

56%