Which of the following statements is false?
Radon is obtained from the decay of radium
Helium is inert gas
Xenon is the most reactive among the rare gases
The most abundant rare gas found in the atmosphere is helium
Which one of the following anions is present in the chain structure silicates?
Si2O
(Si2O2-5)n
(SiO32-)n
SiO
Glass is a
liquid
solid
supercooled liquid
transparent-organic polymer
The formula for calcium chlorlite is
Ca(ClO4)2
Ca(ClO3)2
CaClO2
Ca(ClO2)2
Which one of the following compounds is not a protonic acid?
SO(OH)2
SO2(OH)2
B(OH)3
PO(OH)3
Which of the following is a nitric acid anhydride?
NO
NO2
N2 O5
N2 O3
It is possible to obtain oxygen from air by fractional distillation because
oxygen is in a different group of the periodic table from nitrogen
oxygen is more reactive than nitrogen
oxygen has higher b.p. than nitrogen
oxygen has a lower density than nitrogen
The oxidation states of sulphur in the anions SO ,S2O and S2O62- follows the order
S
S2O2O
SO22O
The alkali metals form salt like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?
CsH > RbH > KH > NaH > LiH
KH > NaH > LiH > CsH > RbH
NaH > LiH > KH > RbH > CsH
LiH > NaH > KH > RbH > CsH
In the manufacture of bromine from sea water the mother liquor containing bromide is treated with
carbon dioxide
chlorine
iodine
sulphur dioxide
