In the following reaction,
P4 + 3NaOH + 3H2O → PH3 + 3NaH2PO2
phosphorus is oxidised
phosphorus is oxidised and reduced
phosphorus is reduced
sodium is oxidised
The passivity of iron in concentrated nitric acid is due to
ferric nitrate coating on the metal
ammonium nitrate coating on the metal
a thin oxide layer coating on the metal
a hydride coating on the metal
Which type of isomers are [Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br?
Hydrate isomers
Ionisation isomers
Ligand isomers
Coordination isomers
Correct IUPAC nomeclature of K4[Fe(CN)6] is
tetra potassium ferrous cyanide
potassium ferri cyanide
potassium ferrocyanide
potassium hexacyanoferrate (II)
Pb2+, Cu2+, Zn2+ and Ni2+ ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution the available precipitate will contain
PbS and NiS
PbS and CuS
CuS and ZnS
CuS and NiS
B.
PbS and CuS
The solubility product of ZnS and NiS are quite high, on the other hand solubility product of PbS and CuS are very low. On passing H2S gas in acidified solution of given ions, ionic product of PbS and CuS exceeds the very low solubility products of their corresponding sulphides. So, PbS and CuS get precipitated.
To an acid solution of an anion a few drops of KMnO4 solution are added. Which of the following, if present will not decolourise the KMnO4 soltuion?
NO
S2-
Cl-
CO
Phosgene is common name of
carbon dioxide and phosphene
phosphoryl chloride
carbonyl chloride
carbon tetrachloride
Which of the following does not contain -COOH group?
Citric acid
Lactic acid
Malanie acid
Picric acid