Which of the following metals are used as catalyst in the Catalytic converters to eliminate poisonous gases?

Which one of the following metals floats in cold water?

Which one of the following pairs of metals are very good conductors of heat?

Which one of the following metals does NOT react with cold water to liberate hydrogen gas?

Which of the following metals does not corrode?

Which one of the following is called the 'metal of future'?