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When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH. Compound ‘X’ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ‘M’ is:

1. Zn
2. Ca
3. Al
4. Fe

Correct answer: Al

Solution

Aluminum reacts with sodium hydroxide to form a white gelatinous precipitate of aluminum hydroxide, which is soluble in excess NaOH. Upon heating, aluminum hydroxide decomposes to form aluminum oxide, a substance commonly used as an adsorbent in chromatography.

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