A) Turns lead acetate paper black
B) Turns acidified potassium dichromate paper green
C) Burns with a blue flame
D) Smells like vinegar
Correct Answer: B
Solution :
\[N{{a}_{2}}S+\text{dil}\text{.2}HCl\to 2NaCl+{{H}_{2}}S\] \[{{H}_{2}}S\ +\ {{H}_{2}}S{{O}_{4}}\ +\ {{K}_{2}}C{{r}_{2}}{{O}_{7}}\ \xrightarrow{\text{acidic}}\ {{K}_{2}}S{{O}_{4}}\] \[+\ \underset{\text{(green)}}{\mathop{C{{r}_{2}}{{(S{{O}_{4}})}_{3}}}}\,\ +\ S\]
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