Question

Which of the following salt solutions has $pH<7$?

• A. $N{H}_{4}F$
• B. $Cr(N{O}_3{)}_3$
• C. $\left[\right(C{H}_3{)}_3\stackrel{\oplus }{N}H]C{l}^{⊝}$
• D. $Ca{I}_2$

Answer 1

Answer: (A), (B), (C)

The correct options are
A $N{H}_{4}F$
B $Cr(N{O}_3{)}_3$
C $\left[\right(C{H}_3{)}_3\stackrel{\oplus }{N}H]C{l}^{⊝}$

The following solutions will form strong acid on hydrolysis and so, they have $pH<7$.

$Cr(N{O}_3{)}_3$ gives $HN{O}_3$

$N{H}_{4}F$ gives $HF$

$\left[\right(C{H}_3{)}_3\stackrel{\oplus }{N}H]C{I}^{⊝}$ gives $HCl$