Which of the following element is most electropositive?
B
Al
Ga
In
Which member of Group 13 elements does not exhibit the Group valency in its compound?
boron
gallium
thallium
aluminium
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
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
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
Boron and aluminium are
s-block elements
p-block elements
d-block elements
f-block elements
which of the following is an electron deficient molecule?
B2H6
C2H6
PH3
SiH4
Which of the following is used in high temperature thermometry?
Na
Ti
Hg
The liquefied metal expanding on solidification is
Zn
Cu
