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Hydrogen gas is neither acidic nor basic, so it does not affect blue or red litmus paper.
Blue litmus changes to red when we dip dil \(NaOH\) is it.
Carbonates and hydrogen carbonates deposits on the metal surface can be removed with diluted \(HCl\) or acetic acid.
2. How can the deposits of carbonates and hydrogen carbonates on the metal surface be cleaned?
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