Question

Inside the sun, four nuclei hydrogen combine to form:
$\left( {\text{A}} \right)$ Two nuclei of helium
$\left( {\text{B}} \right)$ Four nuclei of helium
$\left( {\text{C}} \right)$ One nucleus of helium
$\left( {\text{D}} \right)$ Deuterium.

Answer 1

When two light nuclei are made to combine to form a heavy nucleus a large amount of energy is released in the process. Such a nuclear reaction is called nuclear fusion.
When two light nuclei are combined to form a heavy nucleus, the mass of the product nucleus is slightly less than the sum of the masses of the light nuclei fusing together.

Complete step by step answer:
The nuclear fusion achieved by raising the temperature of the substance so that the nuclei have enough kinetic energy to fuse is called thermonuclear fusion. The energy obtained from the sun and other stars is called stellar energy.
The energy generation in the sun and stars take place by thermonuclear fusion. For thermonuclear fusion to take place, extreme conditions of temperature and pressure are required, which are available only in the interiors of stars including the sun.
In the sun, the fusion reaction is a multistep process at which hydrogen is burned and converts into helium.
So we can say that hydrogen becomes the ‘fuel’ and the helium becomes the ‘ashes’
There are two possible cycles: namely carbon-nitrogen cycle and proton-proton cycle.
Carbon-nitrogen cycle: in this cycle carbon atoms act as a catalyst and four hydrogen nuclei fuse to form a helium nucleus with the release of an enormous amount of energy.
Proton-proton cycle: the proton-proton cycle by which thermonuclear reaction occurs.
$4{}_1{H^1} \to {}_2H{e^4} + 2{}_1{e^0} + E$
From this explanation we can conclude that, inside the sun, four nuclei hydrogen combine to form one nucleus of helium.

Thus, the correct option is C

Note:
-Nuclear fusion is an uncontrolled process.
-Nuclear fusion is not radioactive at the stage of the final product.
-The energy released per unit mass in nuclear fusion is greater than the energy released per unit mass in nuclear fission.