Different isotopes are matched with their uses as (i) Co- 60- To treat cancer (ii) U- 238- To produce electricity (iii) I-131- To treat goitre (iv) Na- 24- In agricultural research Which of the below matches are correct? (i) and (ii) (ii) and (iii) (iii) and (iv) (i) and (iii)

I-131- To treat goitre

U- 238- To produce electricity

(ii) (ii) and (iii)

Explanation:

Radioisotopes have various applications in science. These applications may be positive or negative.

I-131- is used to treat goitre. This is a very important medical application of this isotope of iodine.

U-238 is ordinarily non-fissile but can be transformed to Pu-239 and used as a nuclear fuel for electricity generation.

The rate of disappearance of NO is

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

The rate in terms of reactants is given as negative as the concentration of reactants is decreasing with time whereas the rate in terms of products is given as positive as the concentration of products is increasing with time.

Rate=

Given:

Thus the rate of disappearance of NO =

The rate of disappearance of NO  is