They would float on the surface of the Mercury but they wouldn't react with the Mercury.
That really depends on the temperature of the water and the steel !
If you put an LED in liquid mercury, the LED will still emit light as normal because the mercury is not electrically conductive. However, it is extremely dangerous to handle liquid mercury due to its toxicity, so this experiment should not be attempted.
You would have to put mercury in very low temperatures until it was a solid.
Nothing will happen
Yes Ivan The Terrible did use mercury. Some say, he would treat his back pain with mercury which would put him in a bipolar state.
It would MELT!
it would die
Yes it is. Mercury is in everything no matter what. some governments don't know this and try and take it out but they cant. Mercury is natural in somethings. just like mercury is a natural substance. The question is not, Is there mercury in food, the question is does the government put mercury in food. Of course there may be traces of mercury in food, especially sea food. But governments do not put mercury in food and only a conspiracy theorist nut case would believe that.
Steel contains iron, an inorganic material.
if a meteorologist says that the air pressure is getting lower what you expect to see happen to Torricelli's mercury barometer
You would die.