Given below are two statements:
Assertion (A): | In a radioactive disintegration, an electron is emitted by the nucleus. |
Reason (R): | Electrons are present inside the nucleus. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Assertion: A normal human eye can clearly see all the objects beyond a certain minimum distance.
Reason: The human eye has the capacity to suitably adjust the focal length of its lens to a certain extent.
Assertion: A satellite moving in a circular orbit around the earth has a total energy E0, then its potential energy is –E0.
Reason: Potential energy of the body at a point in a gravitational field of orbit is .
Assertion: If a liquid in a vessel is stirred and left to itself, the motion disappear after few minutes.
Reason: The moving liquid exerts equal and opposite force.
Assertion: At the centre of earth a body has centre of mass, but no centre of gravity.
Reason: This is because g=0 at the centre of earth.
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
1. amylase iodide
2. amylase iodate
3. inclusion complex
4. amylase tetraiodide complex
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