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In the table given below , some commonl...

In the table given below , some commonly used positive and negative radicals are listed . Use the crisscross method to obtain the formulae of the compound that is formed using the given radicals . Name the compound thus obtained.
`{:("No.","Positive radicals","Nagative radicals","Formula","Name of the compound"),(1.,Al^(+3),PO_(4)^(-3),,),(2.,Ca^(+2),NO_(3)^(-1),,),(3.,NH_(4)^(+1),SO_(4)^(-2),,),(4.,Al^(+3),Ca^(-4),,):}`

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