Before the invention of CFCs, which of the compounds was used extensively as a refrigerant?

What is the oxidation state of phosphorus in hypophosphoric acid?

Which of the following is also referred to as ‘Marshall’s acid’?

What is the bond angle of hypochlorous acid?

Which of the following metals does not react with hot water to form an oxide?

What shape is the HNO3 molecule in its gaseous state?

Which group 16 element has the highest tendency for catenation?

Which of the following compounds react with water to give phosphine?