MCQ
Pyrosilicate ion is
- A$SiO_2\,^{2 - }$
- B$SiO_4\,^{2 - }$
- C$S{i_2}O_6\,^{7 - }$
- ✓$S{i_2}O_7\,^{6 - }$

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$2 SO _2( g )+ O _2( g ) \rightleftharpoons 2 SO _3( g ), \Delta H =-190\,kJ$
The number of factors which will increase the yield of $SO _3$ at equilibrium from the following is $.............$.
$A.$ Increasing temperature
$B.$ Increasing pressure
$C.$ Adding more $SO _2$
$D.$ Adding more $O _2$
$E.$ Addition of catalyst
