Daily NEET MCQ- March 4, 2022 - NEET MCQ

Indium impurity in germanium produces p-type semiconductors. A trivalent impurity added to germanium produces a p-type semiconductor. Trivalent impurities such as boron, indium, and gallium are called acceptor impurity.

The monomers involved in addition polymerisation are unsaturated compounds like alkenes and alkadienes. This is because it does not involve the removal of any molecule and hence requires the breaking of a double bond for it to progress.

The biosphere of Earth is heterogeneous in nature and shows immense diversity. There are more than slightly more than 1.5 million species known and still many species are yet to be discovered and described.

Pure semiconductors are called intrinsic semiconductors. The number of electrons in the conduction band will be equal to the number of holes in the valence band. Intrinsic semiconductors are also called undoped and i-type semiconductors.

Depending on the nature of the reactive species involved, addition polymerisation is classified as free radical, anionic and cationic based on whether the initiator is a free radical, anion or cation respectively.

Robert McCredie May is a theoretical ecologist and promoter of science. He estimated that there are almost 7 million species globally.

As phosphorous is pentavalent, it produces n-type semiconductor when added to silicon. They are called donor impurities. By adding phosphorus, extra valence electrons are added that become unbonded from individual atoms.

Benzoquinone combines with the free radical intermediate to form a highly stable, non-reactive radical because of resonance. This inhibits the further progress of the chain growth and therefore, the reaction stops. Peroxides are very important free radical generating initiators.

Based on the currently available species inventories of Earth, out of all species recorded, more than 70 percent of species are of animals. Animals are the consumers that depend on producers for their energy requirements.

A trivalent impurity added to germanium produces a p-type semiconductor. Trivalent impurities such as boron, indium, and gallium are called acceptor impurity. These can be added to germanium in order to obtain a p-type semiconductor.