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 an electron deficient molecule?
B2H6
C2H6
PH3
SiH4
Which of the following is used in high temperature thermometry?
Na
Ga
Ti
Hg
In diborane, the two H — B — H angles are nearly
60º, 120º
95º, 120º
95º, 150º
120ºº, 180ºº
Boron and aluminium are
s-block elements
p-block elements
d-block elements
f-block elements
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 element is most electropositive?
B
Al
In
The liquefied metal expanding on solidification is
Zn
Cu
Which of the following statement is correct about Group 13 elements?
they form only compounds
they form only covalent compounds
they form only co-ordinate compounds
they form both ionic and covalent compounds
