Certain crystals produce electric signals on application of perssure. This phenomenon is called :
pyroelectricity
ferroelectricity
piezoelectricity
ferrielectricity
The element 90Th232 belong to thorium series. Which of the following will act as the end product of the series?
82Pb208
82Bi209
82Pb206
82Pb207
The half-life of a first order reaction having rate constant k =1.7 x10-5 s-1 is :
12.1 h
9.7 h
11.3 h
1.8 h
C.
11.3 h
The half-life of a first order reaction having rate constant k = 1.7 x 10-5 s-1 is 11.3 h
k = 1.7 x 10-5 s-1
In Williamson's synthesis, ethoxyethane is prepared by :
passing ethanol over heated alumina
heating sodium ethoxide with ethyl bromide
treating ethyl alcohol with excess of H2SO4 at 430-440 K
heating ethanol with dry Ag2O
Which of the following amino acid is optically inactive?
Phenyl alanine
Glycine
Glutamic acid
Asparagine
Glucose has difference from fructose in that it:
does not undergo hydrolysis
gives silver mirror with Tollen's reagent
monosaccharide
none of the above