Which metal is the least reactive?

Generally, metals react with acids to produce salt and hydrogen gas. Which of the following acids does not produce hydrogen gas when reacting with most metals (except $Mn$ and $Mg$)?

Which metal burns with a dazzling white light when heated at a high temperature?

State whether the following statement is true or false:
Iron does not burn on heating,but iron filings burn vigorously when sprinkled in the flame of a burner.

Bronze is an alloy of:

Which gas is produced when zinc reacts with diluted hydrochloric acid?