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HCS (Haryana)Prelims2026General Studies
Question
Given below are two statements : Statement I : All metals evolve hydrogen gas upon reaction with hydrochloric acid. Statement II : Hydrogen carbonates of all metals except sodium, react with acids to give a corresponding salt, carbon dioxide and water. In the light of the above statements, choose the correct answer from the options given below:
Options
- A Both Statement I and Statement II are true.
- B Both Statement I and Statement II are false.
- C Statement I is true but Statement II is false.
- D Statement I is false but Statement II is true.
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Correct Answer
B Both Statement I and Statement II are false.
Model Answer
- Only those metals which lie above hydrogen in the reactivity series, such as zinc, magnesium, aluminium and iron, displace hydrogen from dilute acids. Metals like copper, silver, gold and platinum which lie below hydrogen do not evolve hydrogen with hydrochloric acid. Hence, statement I is false.
- All metal carbonates and hydrogencarbonates, including sodium hydrogencarbonate, react with acids to give the corresponding salt, carbon dioxide and water. There is no exception in the case of sodium. Hence, statement II is false.
- For example, sodium hydrogencarbonate reacts with hydrochloric acid to give sodium chloride, water and carbon dioxide, and the gas evolved turns lime water milky.
- Therefore, both the statements are false.