On adding dilute sulphuric acid to a test tube containing a metal ‘X’, a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents metal ‘X’?
(a) Sodium
(b) Sulphur
(c) Copper
(d) Silver
Answer:
(a) Sodium
Sodium metal undergoes a single displacement reaction when mixed with dilute sulphuric acid. It replaces the hydrogen ion as a result of which sodium chloride is formed and hydrogen gas is released. It is a colorless gas