The first ionisation potential of Group 13 elements is lower than that of Group 2 elements, because?
electrons in Group 2 elements are bonded weakly
electrons in Group 13 elements are bonded tightly
Group 13 elements have 3 electrons in valence shell
Group 13 elements have 5 electrons in valence shell
Which of the following is a covalent compound?
AlF3
Al2O3
AlCl3
Al2(SO4)3
The liquefied metal expanding on solidification is
Ga
Al
Zn
Cu
In the Group 13 elements, the +1 oxidation state of thallium is more stable than +3 oxidation state, because of
replusion effect
inductive effect
inert pair effect
increasing atomic number
Which of the following represents the correct outer electronic configuration of the Group 13 elements?
ns2 np1
ns2 np3
ns2 nd1
ns2 np6
Which of the following is true for an element R present in Group 13 of the Periodic Table?
it forms RX2
it forms R2O3
it has oxidation state of +4
it is a gas at room temperature
Which member of Group 13 elements does not exhibit the Group valency in its compound?
boron
gallium
thallium
aluminium
Which of the following element is most electropositive?
B
In
Among the following pair of ions, the lower oxidation state in aqueous solution is more stable than the other, in
TI+ and TI3+
Cu+ and Cu2+
Cr2+ and Cr3+
V2+ and VO2+
In diborane, the two H — B — H angles are nearly
60º, 120º
95º, 120º
95º, 150º
120ºº, 180ºº
