COMEDK2023Evening ShiftChemistrys Block ElementsActual
Choose the incorrect statement.
Options
- AAlkali and Alkaline earth metals cannot be produced by chemical reduction methods.
- BLiF and Li ₃ ~N are thermally stable compounds.
- Cn the vapour phase BeCl ₂ has a polymeric chain structure consisting of numerous BeCl ₂ units.
- DWhen equimolar aqueous solutions of SrCl ₂, MgCl ₂ and BaCl ₂ are taken and their pH is recorded, BaCl ₂ solut
Correct answer
C. n the vapour phase BeCl ₂ has a polymeric chain structure consisting of numerous BeCl ₂ units.
Step-by-step solution
Alkali and alkaline earth metals have very high negative standard electrode potentials, making them strong reducing agents. Therefore, they cannot be reduced by common chemical reducing agents like carbon or hydrogen, so the statement in (hIfp2) is correct. Lithium has a high lattice energy due to the small size of the Li ⁺ ion. LiF has a very high lattice energy, and Li ₃ N is stable due to the high charge density of the nitride ion, making both thermally stable. Thus, (YPHJq) is correct. In the vapour phase, BeCl