Which of the following is true ?

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Minute quantities of boron are used in hardening of steel.

Boron is also a trace element in plants and serves as significant nutrient factor.

Boron occupies the top rank of all elements as absorber.

All of the above are true.

answer is D.

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Detailed Solution

Boron is one of the metals present in steel, thereby it can be said that steel is an alloy of boron. The percentage of boron in steel is less than 1% and its application is to enhance the hardness of the steel.

Therefore, statement present in option (1) is true.

Although boron is a trace element in plants, yet has an important function. It is responsible for the physiological functioning of plants. The deficiency of boron in plants affects the growth and metabolism of the plants.

Therefore, statement present in option (2) is true.

Boron is well known element as a neutron absorber. The structure of boron atom is framed in such a way that it can effectively absorbed high velocity neutron coming from nuclear fission reaction of uranium.

Therefore, statement present in option (3) is true.

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