Question

1 A metal ,which can melt while kept on palm???
2 Name a non metal which is lustrous and a metal which is non lustrous?????
3 Name the metal which react with a very dilute HNO3 to evolve hydrogen gas????
4 Name two metal which are found in nature in the free state ????
5 and most important question
*Why does calcium float in water*????? ​

Answer 1

Answer:

Gallium

Graphite. Sodium

magnesium

silver. platinum

The reaction of calcium with water is less violent. So, the heat released is not sufficient for the hydrogen to catch fire. Calcium starts floating because the bubbles of hydrogen gas which are formed during the reaction stick to the surface of the metal and hence calcium floats on water.