Pure silicon doped with phosphorus is a
metallic conductor
insulator
n-type semiconductor
p-type semiconductor
IUPAC name of the following compound
N, N- dimethylcyclopropane carboxamide
N-methylcyclopropanamide
cyclopropionamide
None of the above
Sodium formate on heating gives
oxalic acid and H2
sodium oxalate and H2
sodium oxalate
CO2 and caustic soda
Which does not give a precipitate with AgNO3 solution?
[Co(NH3)6]Cl3
[Co(NH3)5Cl]Cl2
[Co(NH3)4Cl2]Cl
[Co(NH3)3Cl3]
Total volume of atoms present in a face centred cubic unit cell of a metal is (r is atomic radius)
A.
In fcc unit cell z = 4
Hence, occupied volume by sphere = 4 x
=
Gold number is associated with
amount of gold
protective colloids
purple of cassius
electrophoresis
Noble gases are used in discharge tubes to give different colours. Reddish-orange glow is due to
Ar
Ne
Xe
Kr