Ans: Trivalent impurities are called
Since the trivalent atoms, i.e. dopant having valency 3 i.e an element whose each atom has 3 valence electrons is called Trivalent impurity. For ex. Indium ,Gallium,Aluminium,Boron ,etc. These impurities are known as Acceptor impurities.As they accept electrons from the covalent bonds of Si, Ge. These create p type semiconductor.
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Antinomy is a semi-metal. In its metallic form, it is silvery, hard and brittle.
The correct statement is (d).
In a p-type semiconductor, the holes are the majority carriers, while the electrons are the minority carriers. A p-type semiconductor is obtained when trivalent atoms, such as aluminium, are doped in silicon atoms
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Antonym is CRITICISM.
Synonym is PRAISE and COMMENDATION.