Monoclinic sulphur melts to clear mobile liquid at $119°\mathrm{C}$ but on further heating to $160°\mathrm{C}$ to $190°\mathrm{C},$ it becomes viscous. Also at $200°\mathrm{C},$ the viscosity again decreases, Explain.

Complete the following reaction:

${\mathrm{SF}}_6+2{\mathrm{SO}}_3⟶.............$

Complete the following reaction:

${\mathrm{SF}}_6+{\mathrm{H}}_2\mathrm{O}⟶.........$

Complete the following reaction:

${\mathrm{SF}}_4+{\mathrm{BCl}}_3⟶...........$

Complete the following reactions:

$2{\mathrm{SO}}_3+{\mathrm{F}}_2⟶...........$

Complete the following reaction:

${\mathrm{PCl}}_5+{\mathrm{H}}_2{\mathrm{SO}}_4⟶........$

Complete the following reactions:

Complete the following reactions:

Complete the following reaction:

${\mathrm{SO}}_3+{\mathrm{H}}_2{\mathrm{SO}}_4+{\mathrm{NH}}_2{\mathrm{CONH}}_2⟶...........$