Solutions P and Q each contain a different Group 2 ion at the same concentration. One contains $M{g^{2 + }}{\text{ }}$ and the other contains $B{a^{2 + }}$. Tests are carried out on separate $5c{m^3}$ samples of P and Q.
test 1: add $1c{m^3}$ of $0.1mol\,d{m^{-3}}{\text{ }}N{a_2}S{O_4}\left( {aq} \right)$
test 2: add $1c{m^3}$ of $0.1mol\,d{m^{-3}}NaOH\left( {aq} \right)$
What are the results of these tests?

1 )
A
B
3 )
C
4 )
D
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