Q43. The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is $\_\_\_\_$。 $\mathrm { Ti } ^ { 2 + } , \mathrm { Cr } ^ { 2 + }$ and $\mathrm { V } ^ { 2 + }$ (1) 2 (2) 3 (3) 1 (4) 0
Q43. The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is $\_\_\_\_$。 $\mathrm { Ti } ^ { 2 + } , \mathrm { Cr } ^ { 2 + }$ and $\mathrm { V } ^ { 2 + }$\\
(1) 2\\
(2) 3\\
(3) 1\\
(4) 0