Question

 Which one among the following is an acidic oxide?
(a) Na2O
(b) CO
(c) CO2
(d) Al2O3  

(a) Na2O

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Answer 1

Answer:

(D) Al203 is ThE CoRrEcT AnSwEr.

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Answer 2

(c) CO2 is an acidic oxide.

• An acidic oxide is the one that in the aqueous form will turn blue litmus red or has a pH lesser than 7.
• Oxides of non-metals like CO₂, SO₂, and P₄O₁₀ are a few examples.
• Neutral oxides do not affect the litmus paper and their pH = 7. Examples are CO and NO.
• A basic oxide is the one that in the aqueous form will turn red litmus blue or has a pH greater than 7.
• Oxides of metals like Na₂O and Al₂O₃ are a few examples.