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How many of the following cations belong...

How many of the following cations belongs to group IIA in qualitative salt analysis `Sn^(2+), Hg_(2)^(+2), Pb^(+2), Zn^(2+), Cu^(+2), Cr^(+3), As^(+3), Mg^(+2), Sb^(+3)`

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The correct Answer is:
2
`Pb^(+2), Cu^(+2)`
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