Which one of the following oxides dissolves in water ?<\/p>\n
[amp_mcq option1=”CuO” option2=”Al2<\/sub>O3<\/sub>” option3=”Fe2<\/sub>O3<\/sub>” option4=”Na2<\/sub>O” correct=”option4″]<\/p>\n Which one of the following oxides dissolves in water ? [amp_mcq option1=”CuO” option2=”Al2O3” option3=”Fe2O3” option4=”Na2O” correct=”option4″] This question was previously asked in UPSC NDA-1 – 2016 Download PDFAttempt Online The correct answer is D) Na\u2082O. Metallic oxides generally react with water to form bases. The solubility of metallic oxides in water varies. Oxides of alkali … <\/p>\n
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\n– Al\u2082O\u2083 is aluminium oxide, an amphoteric oxide (reacts with both acids and bases), and is generally insoluble in water.
\n– Fe\u2082O\u2083 is iron(III) oxide, an iron oxide, which is insoluble in water. It is a basic oxide.
\n– Na\u2082O is sodium oxide, an alkali metal oxide. It reacts vigorously with water to form sodium hydroxide (NaOH), a soluble base: Na\u2082O(s) + H\u2082O(l) \u2192 2NaOH(aq). Thus, Na\u2082O effectively dissolves by reacting with water.
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