The magnetic nature of boron molecule is same as the magnetic nature of
nitrogen molecule
carbon molecule
unipositive nitrogen molecule
oxide ion
Which of the following is not a true alum?
Na2SO4.Al2(SO4)3.24H2O
MgSO4.Cr2(SO4)3.24H2O
K2SO4.Cr2(SO4)3.24H2O
(NH4)2SO4.Fe(SO4)3.24H2O
B.
MgSO4.Cr2(SO4)3.24H2O
Alums and pseudoalums are the double salts of general formulae M2SO4M'2(SO4)3·24H2O and MSO4(M'2SO4)3.24H2O respectively. Here the point of difference is that in case of pseudoalums, the metal M is bivalent (which in case of alums is univalent).
Thus, MgSO4Cr2(SO4)3·24H2O is a pseudoalum (or not a true alum.)
The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm-3 respectively. If the standard free energy difference is 1895 J mol-1, the pressure at which graphite will be transformed into diamond is
9.92 × 108 Pa
9.92 × 107 Pa
9.92 × 106 Pa
None of these
The order of covalent character of KF, KI, KCl is
KCl < KF < KI
KI < KCl < KF
KF < KI < KCl
KF < KCl < Kl