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Problem
The compound called microcosmic salt is : a.
Na
2
HPO
4
⋅
2
H
2
O
\text{Na}_2\text{HPO}_4 \cdot 2\text{H}_2\text{O}
Na
2
HPO
4
⋅
2
H
2
O
b.
Na
(
NH
4
)
2
HPO
4
⋅
4
H
2
O
\text{Na}(\text{NH}_4)_2\text{HPO}_4 \cdot 4\text{H}_2\text{O}
Na
(
NH
4
)
2
HPO
4
⋅
4
H
2
O
c.
Na
2
NH
4
PO
4
⋅
2
H
2
O
\text{Na}_2\text{NH}_4\text{PO}_4 \cdot 2\text{H}_2\text{O}
Na
2
NH
4
PO
4
⋅
2
H
2
O
d.
(
NH
4
)
2
HPO
4
⋅
2
H
2
O
(\text{NH}_4)_2\text{HPO}_4 \cdot 2\text{H}_2\text{O}
(
NH
4
)
2
HPO
4
⋅
2
H
2
O
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