A solution of chromium oxide in concentrated sulphuric acid is used for cleaning glass in laboratories because it:

Removes sand particles

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Oxidises grease

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Dissolves glass

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Reacts with dust

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Solution

The correct option is B Oxidises grease
Because a solution of chromium oxide in sulfuric acid (also known as a sulfochromic mixture or chromosulfuric acid) is a powerful oxidizing agent, it can be used to clean laboratory glassware, particularly of otherwise insoluble organic residues.They oxidize the grease present on the glass surfaces and hence thus it can be cleaned.

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