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Question
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 the metal ‘X’?
Options
Sodium
Sulphur
Copper
Silver
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Solution
Sodium
Explanation:
The element X is sodium. When sodium metal reacts with sulphuric acid, sodium replaces the hydrogen ion, forming sodium sulphate and hydrogen gas. When a lit matchstick is brought close to the mouth of the hydrogen gas-filled test tube, it burns with a pop-up sound.
\[\ce{H2SO4 + 2Na -> Na2SO4 + H2}\]
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