The gas used in discharge tubes for optical decoration and advertising is –

Which of the following pair of gases is used for the respiratory activities of divers?

The gas used to inflate the tyres of an aircraft is –

The gas used in the manufacture of Vanaspati Ghee from Vanaspati Oil is –

Which one of the following catalysts is used in hydrogenation of vegetable oils?

The halogen being used as analgesic is –