71.

In the following reaction,

P₄ + 3NaOH + 3H₂O → PH₃ + 3NaH₂PO₂

• phosphorus is oxidised

• phosphorus is oxidised and reduced

• phosphorus is reduced

• sodium is oxidised

Fluorine forms chemical compounds with

• He

• Ne

• Ar

• Xe

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)

Which of the following ions forms most stable complex compound?

• Cu²⁺

• Ni²⁺

• Fe²⁺

• Mn²⁺

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${}_2^{-}$

• S^2-

• Cl^-

• CO${}_3^{2-}$

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