MHT CET202521 Apr 2025Evening ShiftChemistrySurface ChemistryActual
Identify sequential reactions involved in Sol-Gel process .
Options
- APoly condensation and hydorlysis
- BHydrolysis and poly condensation
- CPoly condensation and oxidation
- DOxidation and hydrolysis
Correct answer
B. Hydrolysis and poly condensation
Step-by-step solution
The sol-gel process involves two sequential reactions for producing solid materials from molecular precursors. Hydrolysis replaces alkoxy groups with hydroxyl groups: M(OR)_n + xH₂ O M(OH)_x(OR)_ n-x + xROH Polycondensation follows, forming metal-oxygen-metal bridges through either olation/oxolation or esterification: M-OH + HO-M M-O-M + H₂ O M-OR + HO-M M-O-M + ROH This sequence establishes the correct order as hydrolysis followed by polycondensation, corresponding to option B.