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
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
HCHO reacts with CH3MgI to give:
CH3CH2OH
CH3OH
CH3CH2I
CH3I
A.
CH3CH2OH
HCHO reacts with CH3MgI to give CH3CH2OH. It can be represented by the following equation:
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