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 is used in high temperature thermometry?
Na
Ga
Ti
Hg
Antidote for carbon monoxide poisoning is
carbogen
carborundum
carbon dioxide
carbonyl chloride
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+
Which of the following element is most electropositive?
B
Al
In
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 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 represents the correct outer electronic configuration of the Group 13 elements?
ns2 np1
ns2 np3
ns2 nd1
ns2 np6
In diborane, the two H — B — H angles are nearly
60º, 120º
95º, 120º
95º, 150º
120ºº, 180ºº
