Home
Class 12
CHEMISTRY
ZnO crystals on heating acquires the for...

ZnO crystals on heating acquires the formuls `Zn_(1+x)O`.
Or
There is an increase in conductivity when silicon doped with phosphorus. Give reason.

Text Solution

Verified by Experts

On heating, ZnO loses oxygen `O^(2-)` ions and changes to `Zn^(2+)` ions. Due to the presence of excess `Zn^(2+)` ions, `Zn(1+x)O` is formed.
Or
As as result of doping of group 14 element with group 15 element, the extra electrons available are responsible for increase in electrical conductivity. n-p type semi-conductors are formed as a result of this.
Promotional Banner

Similar Questions

Explore conceptually related problems

Why does the conductivity of silicon increase upon doping with phosphorus ?

Give reason : (a) Why is Frenkel defect found in AgCl ? (b) What is the difference between silicon doped with phosphorus and doped with gallium semi-conductors ?

Give reasons Silicon doped with phosphorus, gives an n-type semiconductor, while p-type semiconductor is obtained when silicon is doped with gallium.

Why does the electrical conductivity of germanium crystal increase when it is doped with gallium?

(a) Calculate the number of unit cell in 8.1g of aluminium if it crystallises in a fcc structure. (Atomic mass of Al = 27 g*mol^(-1) ) (b) Give reasons: (i) In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect. (ii) Silicon on doping with Phosphorous forms n-type semiconductor. (iii) Ferrimagnetic substances show better magnetism than anti-ferromagnetic substances.

Column I, Column II A circular plate is expanded by heat from radius 6 cm to 6.06 cm. Approximate increase in the area is, p. 5 If an edge of a cube increases by 2%, then the percentage increase in the volume is, q. 0.72 pi If the rate of decrease of (x^2)/2-2x+5 is thrice the rate of decrease of x , then x is equal to (rate of decrease in nonzero)., r. 6 The rate of increase in the area of an equailateral triangle of side 30c m , when each side increases at the rate of 0. 1c m//s , is, s. (3sqrt(3))/2

The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)l the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The resistance of a metal wire increases by 10% when its temperature rises from 10^@C to 110^@C .The temperature coefficient of resistance of the metal is

When a current of x ampere from a 20.9 V battery is used for 4.0 s to heat 100 g water, its temperature increased by 1^@C . Heat capacity of water is 4.18 JK^-1 . If all the electrical energy is converted into thermal energy, what is x ?