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 of the following is an electron deficient molecule?
B2H6
C2H6
PH3
SiH4
In diborane, the two H — B — H angles are nearly
60º, 120º
95º, 120º
95º, 150º
120ºº, 180ºº
The liquefied metal expanding on solidification is
Ga
Al
Zn
Cu
The outermost ground state electronic configuration of Group 14 element is
ns2 npx1 npy1 npz0
ns2 npx2 npy1 npz0
ns1 npx1 npy1 npz1
ns1 npx2 npy1 npz0
Which of the following is used in high temperature thermometry?
Na
Ti
Hg
Which one of the following element has the highest melting point?
B
Which of the following element is most electropositive?
In
Which member of Group 13 elements does not exhibit the Group valency in its compound?
boron
gallium
thallium
aluminium
Antidote for carbon monoxide poisoning is
carbogen
carborundum
carbon dioxide
carbonyl chloride
