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Chemistry
Chemistry
Problem
A red solid is insoluble in water but soluble in the presence of
KI
\text{KI}
KI
. Heating the red solid in a test tube results in the formation of yellow sublimate in the part of the test tube. The red solid is: a.
Pb
3
O
4
\text{Pb}_3\text{O}_4
Pb
3
O
4
b.
HgI
2
\text{HgI}_2
HgI
2
c.
HgO
\text{HgO}
HgO
d.
(
NH
4
)
2
Cr
2
O
7
(\text{NH}_4)_2\text{Cr}_2\text{O}_7
(
NH
4
)
2
Cr
2
O
7
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