Name a metal which is so soft that it can be cut with a knife.

61 Metals are said to be shiny. Why do metals generally appear to be dull? How can their brightness be restored? 62 What are metals? Name five metals. 62 Name the metal which is the best conductor of heat and electricity. 62 What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.