Tutor profile: Shubham S.
Subject: Physical Chemistry
Q. On what principle, Rotorvap (an instrument in synthetic chemistry laboratories) work?
A. Rotorvap is an instrument that is used to evaporate the solvent in the reaction mixture to get the dried compound at the end. It works based on the three principles: 1. On increasing the pressure, the boiling point of the solution lowers. 2. Rotating the solution increases the surface area. 3. Heating the solution. All three reasons help the solvent to evaporate easily, leaving behind a solid or a concentrated liquid as a reaction mixture.
Subject: Inorganic Chemistry
Q. What is the strongest reason for the failure of Valence Bond Theory in Co-ordination Complexes?
A. Valence Bond Theory didn't assume any lifting of the d-set orbitals. Due to this, the possibility of an electronic transition (reason for colour and spectral properties) in complexes was difficult to assume. Crystal Field Theory and Ligand Field Theory, later on, assumed the splitting of d-set orbitals in theory.
Q. What is a unique periodic property that increases across a period and along with a group?
A. Acidic Character of Hydrides. Across a period. CH4<NH3<H2O<HF. Along with a group. HF<HCl<HBr<HI