Answer the following : (a) Name of element of group `13` which forms the most stable compound in `+1` oxidation state. (b) Name the element of group `13` which has the highest first ionisation enthalpy. ( c) Name the element of group `13` which is used as a reducing agent in metallurgical processes. (d) Name of element of group `13` which can show convalency maximum of four only. Name the compound of aluminium which is used as a germicide and coagulant of the purification of water. (f) Name the first two elements of group `13`.

Answer the following : (a) Name of element of group `13` which forms t

1.	Answer the following : (a) Name of element of group `13` which forms the most stable compound in `+1` oxidation state. (b) Name the element of group `13` which has the highest first ionisation enthalpy. ( c) Name the element of group `13` which is used as a reducing agent in metallurgical processes. (d) Name of element of group `13` which can show convalency maximum of four only. Name the compound of aluminium which is used as a germicide and coagulant of the purification of water. (f) Name the first two elements of group `13`.
Answer» (a) Thallium (b) Boron ( c) Aluminium (d) Boron (d) Boron ( e) Potash alum, `K_(2) SO_(4) Al_(2) (SO_(4))_(3) .24 H_(2) O` (f) Boron and aluminium.