Magnesium produces a gas when added to an acidic solution. If sodium carbonate is added to the same solution, which other gas will be released?
Answer and explanation
Correct answer: Carbon dioxide
The governing concept is that acids react differently with metals and carbonates. Magnesium reacts with an acid to produce hydrogen, for example Mg + 2HCl → MgCl2 + H2. Sodium carbonate reacts with the acid to form a salt, water, and carbon dioxide: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. Thus the second gas is carbon dioxide, so option A is correct; hydrogen belongs to the magnesium reaction, while oxygen and ammonia are not products here.
Frequently asked questions
What is the correct answer to this question?
Carbon dioxide
Why is this the correct answer?
The governing concept is that acids react differently with metals and carbonates. Magnesium reacts with an acid to produce hydrogen, for example Mg + 2HCl → MgCl2 + H2. Sodium carbonate reacts with the acid to form a salt, water, and carbon dioxide: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. Thus the second gas is carbon dioxide, so option A is correct; hydrogen belongs to the magnesium reaction, while oxygen and ammonia are not products here.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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