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How many of the following carbons belong...

How many of the following carbons belongs to IIA, III, IV and V only in qualitative salt analysis `Hg_(2)^(2+), As^(+3), Zn^(+2), Mg^(+2), NH_(4)^(+), Sr^(+2), Pb^(+2), Ni^(+2)`

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The correct Answer is:
3
`As^(+3), Zn^(+2), Ni^(+2), Sr^(+2), Pb^(+2)`
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