Which one of the following exhibits highest oxidation state?

Oxygen stabilises higher oxidation state because_______.

The trend in ionisation enthalpy of a transition element is not regular because,_______.

Identify the paramagnetic species.

The highest possible oxidation state shown by osmium in its compound is_______.

Hybridisation of chromium ions and dichromate ions is ________.

Which of the following is wrong with respect to lanthanide contraction?

Most of the transition metal ions are coloured, because of the ________.

The catalytic activity of transition metals is due to ________.

When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH₃ to give an explosive compound (C). The compound A, B and C are ________.

MnO₄^- react with Br^- in alkaline P^H to give ________.

A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate. The gas (B) turns potassium dichromate acidified with dil H₂SO₄ to a green coloured solution(C).  A, B and C are respectively ________.

Which of the following does not give oxygen on heating?

The alloy of copper that contain Zinc is________.

Which of the following compounds is colourless?