Question:
\(CrO_3\) is a/an
\(CrO_3\) is a/an
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Metal oxides in high oxidation states are acidic, while those in low oxidation states are basic.
Updated On: Apr 28, 2026
- acidic oxide
- basic oxide
- neutral oxide
- amphoteric oxide
- reducing agent
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The Correct Option is A
Solution and Explanation
Step 1: Identify oxidation state of chromium.
In \(CrO_3\): \[ Cr + 3(-2) = 0 \Rightarrow Cr = +6 \] So chromium is in a very high oxidation state.
Step 2: Recall nature of oxides.
Oxides of metals in high oxidation states are generally acidic in nature.
Step 3: Check behavior of \(CrO_3\).
\(CrO_3\) reacts with water to form chromic acid: \[ CrO_3 + H_2O \rightarrow H_2CrO_4 \]
Step 4: Identify acid formation.
Formation of an acid from oxide confirms that it is an acidic oxide.
Step 5: Eliminate other options.
It is not basic (low oxidation state metals are basic), not amphoteric (like \(Al_2O_3\)), and not neutral.
Step 6: Confirm classification.
Thus, \(CrO_3\) behaves as an acidic oxide.
Step 7: Final answer.
\[ \boxed{\text{acidic oxide}} \] which matches option \((1)\).
In \(CrO_3\): \[ Cr + 3(-2) = 0 \Rightarrow Cr = +6 \] So chromium is in a very high oxidation state.
Step 2: Recall nature of oxides.
Oxides of metals in high oxidation states are generally acidic in nature.
Step 3: Check behavior of \(CrO_3\).
\(CrO_3\) reacts with water to form chromic acid: \[ CrO_3 + H_2O \rightarrow H_2CrO_4 \]
Step 4: Identify acid formation.
Formation of an acid from oxide confirms that it is an acidic oxide.
Step 5: Eliminate other options.
It is not basic (low oxidation state metals are basic), not amphoteric (like \(Al_2O_3\)), and not neutral.
Step 6: Confirm classification.
Thus, \(CrO_3\) behaves as an acidic oxide.
Step 7: Final answer.
\[ \boxed{\text{acidic oxide}} \] which matches option \((1)\).
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