Which of the following hydroxide is most acidic in nature?
B(OH)3
Al(OH)3
In(OH)3
Ti(OH)
Which of the following is used in high temperature thermometry?
Na
Ga
Ti
Hg
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 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
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
Antidote for carbon monoxide poisoning is
carbogen
carborundum
carbon dioxide
carbonyl chloride
Which of the following is a covalent compound?
AlF3
Al2O3
AlCl3
Al2(SO4)3
In diborane, the two H — B — H angles are nearly
60º, 120º
95º, 120º
95º, 150º
120ºº, 180ºº
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+