What is formed when ammonium dichromate is heated?
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A.
Nitrogen, oxygen and chromium oxide
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B.
Chromium oxide and water
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C.
Chromium and oxygen
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D.
Chromium oxide and nitrogen
Correct Answer:
A. Nitrogen, oxygen and chromium oxide
Explanation:
When ammonium dichromate ((NH4)2Cr2O7) is heated, it undergoes a thermal decomposition reaction that produces chromium(III) oxide (Cr2O3), nitrogen gas (N2), and water vapor (H2O). This exothermic process is famously known as the chemical volcano because the resulting green chromium oxide is much more voluminous than the original orange crystals, creating an ash-like mound. According to the chemical equation (NH4)2Cr2O7 ? Cr2O3 + N2 + 4H2O, the correct products are chromium oxide and nitrogen.
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