Reducing Property

The following are some statements related to group 15 hydrides. (i) Reducing property increases from NH_3 to BiH_3 (ii) Tendency to donate lone pair decreases from NH_3 to BiH_3 (iii) Thermal stability of hydrides decreases from NH_3 to BiH_3 (iv) Bond angle decreases from NH_3 to BiH_3 .

Reducing properties of halogen acid are

Colourless gas that has oxidising as well as reducing properties:

Out of the following acids, the one which has the capability to form complex compound and also possesses oxidising and reducing properties is

Of the following acids, the one which possesses oxidising and reducing properties and has the capability to form complex compound is