There are four test tubes containing dilute `HCl, BaCl_(2), HgCl_(2) " and" KNO_(3)` solutions. Which of the following reagents will help in the identification of `BaCl_(2)` ?

Options

A. `NaOH`
B. `K_(2)CrO_(4)`
C. `AgNO_(3)`
D. both (2) and (3)

Answer

B

Explanation

`Ba^(2+)+CrO_(4)^(2-) to BaCrO_(4) darr ("yellow"), Ag^(+) + Cl^(-) to AgCl darr ("white")`.