Why is diamond a had conductor of electricity but a good conductor of

1.	Why is diamond a had conductor of electricity but a good conductor of heat ?
Answer» Conduction of electricity of essentially requires movement of electrons while conduction of heat does not necessarily require movement of electrons. Since in diamond, all the electrons are firmly held C-C, `sigma`-bonds, there are no free electrons in a diamond crystal. Therefore, diamond is a bad conductor of electricity. In contrast, conduction of heat is due to thermal vibrations from one atom to the other which is easier in a compact crystal of diamond.

Discussion

No Comment Found

Related InterviewSolutions

In which following statement are correct. (a) Anhydrous hydrogen fluroide is a liquid at ordianry temperature while other halogen acid are gases. (b) Lead acetate does not form any precipitate with HF acid but other halogen acid from precipitates. (c) HF is heated with a mixture of `MnO_2` and `H_2SO_4`, no gas is evolved but In case of HCI, HBr and HI acids evolved gases. (d) HF is not oxidised by strong oxidising agent but other halogen acid are oxidised.A. (A) aB. (B) bC. (C) cD. d
Give the preparation of a) `XeOF_(4)` and b) `XeO_(2)F_(2)`
An amorphous solid (X) burns in air to form a gas (Y) which turns lime water milky. This gas decolourises aqueous solution of acidified `KMnO_4`. Gas (Y) reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y and Z areA. X-C, Y-CO, Z-`CO_2`B. X-S, Y-`SO_2` , Z-`SO_3`C. X-P , Y-`P_2O_3` ,Z - `P_2O_5`D. X-S , Y-`SO_3` ,Z-`H_2SO_4`
A solution of a salt in water on addition of dilute `HCL` gives a white ppt. solution in hot water. The salt contains:A. `Pb^(2+)`B. `Ag^(+)`C. `H^(2+)`D. `Fe^(2+)`
The correct order of decreasing ionic nature of lead dihalides isA. `PbI_(2) lt PbBr_(2) lt PbCl_(2) lt PbF_(2)`B. `PbF_(2) lt PbBr_(2) lt PbCl_(2) lt PbI_(2)`C. `PbF_(2) lt PbCl_(2) lt PbBr_(2) lt PbI_(2)`D. `PbF_(2) lt PbCl_(2) lt PbBr_(2) lt PbI_(2)`
The heavier elements of groups 13 and 14 besides the group oxidation state exhibit another oxidation state which is two units lower than the group oxidation state and the stability of this lower oxidation state increases down the group. This concept which is commonly called inert pair effect has been used to explain many physical and chemical properties of the element of these groups. Element of group 13A. exhibit oxidation state of `+3` onlyB. form `M^(+)` and `M^(3+)` ionsC. exhibit oxidation states of +1 and +3D. form `M^(-)` and `M^(+)` ions
Which of the following are used as catalyst in Friedel-Crafts reactions ?A. `AlCl_(3)`B. `SiCl_(4)`C. `BF_(3)` is the strongest Lewis acid among the other boron halidesD. `SnCl_(4)`
Substances which readily undergo hydrolysis areA. `AlCl_(3)`B. `BCl_(3)`C. `SiCl_(4)`D. `PbCl_(4)`
Hot concentrated sulpuric acis is a moderatly strong oxidizing agent. Which of the following reaction does not shwo oxidizing behaviour?A. `Cu + 2H_(2)SO_(4) rarr CuSO + SO_(2) + 2H_(2)O`B. `3S + 2H_(2)SO_(4) rarr 3SO_(2) + 2H_(2)O`C. `C + 2H_(2)SO_(4) rarr CO_(2) + 2SO_(2) + 2H_(2)O`D. `CaF_(2) + H_(2)SO_(4) rarr CaSO_4) + 2HF`
The exhibition of highest co-ordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in `MF_(6)^(3-)` ?A. BB. AlC. GaD. In

Why is diamond a had conductor of electricity but a good conductor of heat ?

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment