Compounds of nitrogen and phosphorus are mostly________________?
(A) ionic
(B) covalent
(C) polar
(D) all varieties are possible
Which of the following is different with respect to physical appearance ?
(A) Arsenic
(B) Phosphorus
(C) Antimony
(D) Bismuth
Which one of following is not a property of pure quartz ?
(A) Coloured solid
(B) Brittle
(C) Hard
(D) All of above
Phosphene gas will be produced if phosphorous acid is subjected to___________________?
(A) Oxidation
(B) Reduction
(C) Decomposition
(D) Both b & c
Which one of the followings possesses melting point below 0°C?
(A) Nitrogen
(B) Phosphorus
(C) Carbon
(D) Bismuth
When sulphuric acid is treated with ethanol sulphuric acid behaves like________________?
(A) an acid
(B) a dehydrating agent
(C) an oxidizing agent
(D) as sulphonating agent
Arsenic oxides are removed by passing through_________________?
(A) Ferric hydroxide
(B) Sodium hydroxide
(C) Calcium hydroxide
(D) Aluminium hydroxide
Oxygen and sulphur resemble in all except________________?
(A) Electronic conviguration of valence shell electrons
(B) Show allotropy
(C) Polymeric
(D) Show same oxidation state