Multiple choice general knowledge science & technology

What gas is evolved when HCl is poured on marble chips?

  1. Carbon Dioxide

  2. Hydrogen Peroxide

  3. Hydrogen

  4. Calcium Carbonate
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A Correct answer
Explanation

Marble chips are primarily calcium carbonate (CaCO3). When hydrochloric acid (HCl) reacts with calcium carbonate, it produces calcium chloride, water, and carbon dioxide gas (CO2). Hydrogen gas is typically evolved when acids react with metals, not carbonates.

AI explanation

To answer this question, you need to understand the reaction between HCl (hydrochloric acid) and marble chips (calcium carbonate).

When HCl is poured on marble chips, it reacts with the calcium carbonate in the marble chips to produce carbon dioxide gas. This is a common reaction known as a neutralization reaction.

The balanced chemical equation for this reaction is:

HCl + CaCO3 → CaCl2 + CO2 + H2O

From the equation, we can see that carbon dioxide gas (CO2) is evolved as a product of the reaction.

Therefore, the correct answer is:

A. Carbon Dioxide

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