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Problem
Problem
Sodium thiosulphate is formed when: a.
SO
2
\text{SO}_2
SO
2
is boiled into
Na
2
S
\text{Na}_2\text{S}
Na
2
S
b.
Na
2
SO
3
\text{Na}_2\text{SO}_3
Na
2
SO
3
is boiled with elemental sulphur c.
H
2
S
2
O
3
\text{H}_2\text{S}_2\text{O}_3
H
2
S
2
O
3
is neutralised by
NaOH
\text{NaOH}
NaOH
d.
Na
2
SO
4
\text{Na}_2\text{SO}_4
Na
2
SO
4
is reduced by zinc dust
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