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

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
${C_6}{H_5}(l)\, + \,\frac{{15}}{2}\,{O_2}(g)\, \to \,6\,C{O_2}(g)\, + \,3{H_2}O\,(l);$ $\Delta H = \,-\,3271\,kJ$
What is $\Delta U$ for the combustion of $1.5\,mole$ of benzene at $27\,^oC$ ? .....$kJ$