A) hydrogen gas is bubbled through it
B) air is passed through it
C) zinc pieces are added to it
D) zinc chloride is added to it
Correct Answer: C
Solution :
Zinc pieces react with \[{{H}_{2}}S{{O}_{4}}\]to give hydrogen in the nascent form. Nascent hydrogen readily turns\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]solution green.
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