A detergent `(C_(12)H_(25)SO_(4)^(-)Na^(+))` solution becomes colloidal sol at a concentration of `10^(-3)`M . On an average `10^(13)` colloidal partcles are present in `1mm^(3)` . What is the average number of ions which are contained by one colloidal particle (micelle)?
`6xx10^(7)`,
`10`,
`60`,
none of these.
A semiconductor has equal electron and hole concentration of 4.2 xx 10^8 m^(-3) .On doping with a certain impurity,electron concentration increases to 6xx10^(12)m^(-3) . identify the new seiconductor obtained after doping.
A semiconductor has equal electron and hole concentration of 6 xx 10^4m^-3 . On doping with a certain impurity electron concentration increases to 8xx10^12m^-3 . Identify the type of semiconductor?
The acid dissociation constant of uric acid is K_(a)=4.0xx10^(-6) M. The pH of a sample of urine is 6.0. What is the ratio of concentration of urate ion to uric acid in the urine?
What concentration of FCH_(2)COOH (K_(a)=2.6xx10^(-3)) is needed so that [H^(+)] =2xx10^(-3) ?
H_(2) A is a weak diprotic acid. If the pH of 0.1 M H_(2)A solution is 3 and concentration of A^(2-) is 10^(-12) at 25^(@)C. Select correct statement (s)
The average speed at temperature T^(@)C of CH_(4)(g) is sqrt((28)/(88))xx10^(3)ms^(-1) . What is the value of T ?
In an electromagnetic wave,the amplitude of oscillating magnetic field is 2 xx 10^(-7) T. What is the amplitude of oscillating electric field in the wave?Given c=3 xx 10^8 m s^(-1) .
The magnetic field of a beam emerging from a filter facing a floodlight is given by B_0=12xx10^-8sin(1.20xx10^7 z-3.60 xx 10^15t)T . What is the average intensity of the beam?
A solution contaning 2.7 xx 10^(-3) mol of A^(2+) "ion required" 1.6 xx 10^(-3)mol of MnO_(4)^(2-) for the oxidation of A^(2+) "to" AO_(3)^(-) the medium is:
What is the ionization constant of an acid if the hydronium ion concentration of a 0.40 M solution is 1.40xx10^(-4) M?
