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+
The liquefied metal expanding on solidification is
Ga
Al
Zn
Cu
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 hydroxide is most acidic in nature?
B(OH)3
Al(OH)3
In(OH)3
Ti(OH)
Which one of the following element has the highest melting point?
B
Ti
Antidote for carbon monoxide poisoning is
carbogen
carborundum
carbon dioxide
carbonyl chloride
Boron and aluminium are
s-block elements
p-block elements
d-block elements
f-block elements
Which of the following is used in high temperature thermometry?
Na
Hg
In diborane, the two H — B — H angles are nearly
60º, 120º
95º, 120º
95º, 150º
120ºº, 180ºº