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
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
Which one of the following forms a basic oxide?
B
Tl
Al
Ga
C.
Al
More the element has metallic character, more basic its its oxide. As the metallic character increases down the group hence, thallium (Tl) has highest metallic character (among the given option) and forms the basic oxide.
Al and Ga form amphoteric oxide and B (Boron) forms acidic oxide.
The gas produced by the passage of air over hot coke is
carbon monoxide
carbon dioxide
producer gas
water gas
The bonding in diborane (B2H6) can be described by
4 two centre - two electron bonds and 2 three - centre- two electron bonds
3 two centre - two electron bonds and 3 three - centre- two electron bonds
2 two centre - two electron bonds and 4 three centre - two electron bonds
4 two centre - two electron bonds and 4 two- centre- two electron bonds