Question:
An alkaline (NaOH) solution of a compound produces a yellow colored solution on addition of NaBO3. The compound is
An alkaline (NaOH) solution of a compound produces a yellow colored solution on addition of NaBO3. The compound is
Updated On: Nov 17, 2025
- Mn(OH)2
- Pb(OH)2
- Cr(OH)3
- Fe(OH)3
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The Correct Option is C
Solution and Explanation
The question pertains to identifying which compound produces a yellow-colored solution on reacting with an alkaline (NaOH) solution and NaBO3. Let's analyze the given options one by one:
- The compound Mn(OH)2: In alkaline solutions, manganous hydroxide does not participate in a reaction with NaBO3 to yield a yellow color. Therefore, this option is incorrect.
- The compound Pb(OH)2: Lead hydroxide in an alkaline environment also does not react with NaBO3 to produce a yellow-colored solution. Thus, this option is incorrect.
- The compound Cr(OH)3: Chromium hydroxide, in the presence of excess NaOH, forms chromate ions (CrO42-), which are yellow in color. The reaction with NaBO3 enhances the formation of these chromate ions, confirming the yellow coloration, making Cr(OH)3 the correct answer.
- The compound Fe(OH)3: Iron(III) hydroxide does not react with NaBO3 to produce a yellow solution in alkaline conditions. Therefore, this option is incorrect.
From this analysis, it is evident that the correct answer is Cr(OH)3. The chromate ions formed in alkaline conditions are responsible for the yellow coloration.
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