Answer
Verified
396k+ views
Hint: We know that, modern periodic table has eighteen groups and seven periods. Elements present in the 16th group of modern periodic table are oxygen, sulphur, tellurium, selenium and polonium. Another name of this group is group of chalcogens.
Complete answer:
> Now, we discuss the conductivity of sulphur, selenium and tellurium. We know that conductivity of a metal is due to movement of ions. Sulphur is a non-metal and we know non-metals are bad conductors of heat and electricity. Electrons of sulphur held very tightly and thus their movement is not possible. So, sulphur is an insulator.
> Now, we discuss semiconductors. Semiconductors are the substances whose conductivity is between insulator and conductor. Selenium is a semiconductor and therefore it is used in production of rectifiers (devices that convert AC to DC).
> Now, we discuss tellurium. Tellurium is a semiconductor which shows more electrical conductivity in specific directions on the basis of alignment of atoms and also its conductivity increases slightly on exposure to light. When tellurium is in molten state, it is corrosive to iron, copper, etc.
Therefore, sulphur is an insulator and selenium and tellurium both are insulators.
Hence, option A is correct.
Note: It is to be noted that, on moving down the group electrical conductivity increases because of increase of atomic radius. Larger the atom, weaker the attraction of nucleus to electrons and this results in free movement of electrons and we know conductivity is due to movement of electrons.
Complete answer:
> Now, we discuss the conductivity of sulphur, selenium and tellurium. We know that conductivity of a metal is due to movement of ions. Sulphur is a non-metal and we know non-metals are bad conductors of heat and electricity. Electrons of sulphur held very tightly and thus their movement is not possible. So, sulphur is an insulator.
> Now, we discuss semiconductors. Semiconductors are the substances whose conductivity is between insulator and conductor. Selenium is a semiconductor and therefore it is used in production of rectifiers (devices that convert AC to DC).
> Now, we discuss tellurium. Tellurium is a semiconductor which shows more electrical conductivity in specific directions on the basis of alignment of atoms and also its conductivity increases slightly on exposure to light. When tellurium is in molten state, it is corrosive to iron, copper, etc.
Therefore, sulphur is an insulator and selenium and tellurium both are insulators.
Hence, option A is correct.
Note: It is to be noted that, on moving down the group electrical conductivity increases because of increase of atomic radius. Larger the atom, weaker the attraction of nucleus to electrons and this results in free movement of electrons and we know conductivity is due to movement of electrons.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Write an application to the principal requesting five class 10 english CBSE
Difference Between Plant Cell and Animal Cell
a Tabulate the differences in the characteristics of class 12 chemistry CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
What organs are located on the left side of your body class 11 biology CBSE
Discuss what these phrases mean to you A a yellow wood class 9 english CBSE
List some examples of Rabi and Kharif crops class 8 biology CBSE