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
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
D.
CO
KMnO4 acts as oxidising agent in acid medium. In acid medium it get reduced and its colour changes from violet to colourless. Elements present in their maximum oxidation state does not oxidised. In, CO carbon has maximum oxidation state +IV. So presence of, CO will
not decolourise the, KMnO4 solution.
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