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Question

Which amongst the following chemicals is used in preliminary tests for anions?

A
NaOH
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B
H2SO4
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C
NaHCO3
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D
CH3COOH
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Solution

The correct option is B H2SO4
Anions are negatively charged. A strong acid like H2SO4 provides H+ cations which can easily react with almost all anions to release various gases. These released gases can be observed as effervescence.

Although most acids can provide H+ ions, weak acids like CH3COOH cannot be used for analysis. This is because the number of H+ ions provided by weak acids will be lesser as compared to strong ones like H2SO4 and HCl.

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