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Question
When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
- Name any two metals which can behave like metal X.
- Name any two acids which can behave like acid Y.
- Name the gas Z.
- Is the gas Z lighter than or heavier than air?
- Is the reaction between metal X and dilute acid Y exothermic or endothermic?
- By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
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Solution
- Zinc (Zn) and magnesium (Mg) metals can behave like metal X.
- Sulphuric acid (H2SO4) and hydrochloric acid (HCl) can behave like acid Y.
- Gas Z is hydrogen gas (H2).
- Gas Z (i.e., hydrogen) is lighter than air because it is the lightest element in the periodic table.
- The reaction between metal X and dilute acid Y is exothermic because it produces a huge amount of heat.
- If X is zinc and Y is sulphuric acid, then the equation can be written as follows:
\[\ce{Zn_{(s)} + H2SO4_{(aq)} -> ZnSO4_{(aq)} + H2_{(g)}}\]
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