Which of the following compounds is expected to be optically active ?
(CH3)2CHCHO
CH3CH2CH2CHO
CH3CH2CHBrCHO
CH3CH2CBr2CHO
Which one of the following is a second order reaction ?
H2 + Br2 2HBr
NH4NO3 N2 + 3H2O
H2 + Cl2 2HCl
CH3COOCH3 + NaOH CH3COONa + CH3OH
Formation of coloured solution is possible when metal ion in the compound contains :
paired electrons
lone pair of electrons
unpaired electrons
None of the above
In the periodic table metals usually used as catalysts belong to :
f - block
d - block
p - block
s - block
In a neutron induced reaction of , the product obtained is , three neutrons and an element (new nuclide) .The other new nuclide is :
The lanthanide contraction is responsible for the fact that :
Zr and Zn have the same oxidation state
Zr arid Hf have about the same radius
Zr and Nb have similar oxidation state
Zr and Y have about the same radius
When a sulphur sol is evaporated sulphur is obtained .On mixing with water sulphur sol is not formed .The sol is :
lyophilic
reversible
hydrophobic
hydrophilic
C.
hydrophobic
Hydrophobic sol are irreversible in nature .They have no affinity between the dispersed phase and the dispersion medium (H2O) .Further once precipitated , they do not form the colloidal sol by simple addition of water .