The relationship between rate constant and half-life period of zero order reaction is given by
= [A0] 2k
=
van't Hoff factor of centimolal solution of K3[Fe(CN)6] is 3.333. Calculate the per cent dissociation of K3[Fe(CN)6].
33.33
0.78
78
23.33
How is ore of aluminium concentrated?
Roasting
Leaching
Froth floatation
Using Wilfley table
B.
Leaching
Leaching is the method of extraction of aluminium from its ore (bauxite). By the treatment of powdered ore with a concentrated solution of NaOH resulting in dissolution of Al2O3, leaving impurities behind as,
Al2O3 (s) + 2OH- (aq) + 3H2O → 2[Al(OH)4]- (aq)
This process is known as Baeyer's process.
Which metal among the following has the highest packing efficiency?
Iron
Tungsten
Aluminium
Polonium
Half-life period of a first order reaction, A → product is 6.93 h. What is the value of rate constant?
1.596 h-1
0.1 h-1
4.802 h-1
10 h-1
The correct IUPAC name of [Co(NH3)3(NO2)3] is
Triammine trinitro-N cobalt (III)
Triammine trinitro-N cobalt (II)
Triammine cobalt (III) nitrite
Triammine trinitro-N cobaltate (III)
The replacement of diazonium group by fluorine is known as
Gattermann reaction
Sandmeyer reaction
Balz-Schiemann reaction
Etard reaction
R-C≡N + 2H RCHO + NH4Cl, this reaction is known as
Etard reaction
Stephen reaction
Hell-Volhard-Zelinsky reaction
Balz-Schiemann reaction
Diethyl amine when treated with nitrous acid yields
diethyl ammonium nitrite
ethyl alcohol
N-nitroso diethyl amine
triethyl ammonium nitrite