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Group 5A and Group 6A elements - 12
1.
Chemical formula of apatite is Ca
3
F (PO
4
)
3
.
a) False
b) True
2.
Reaction of Phosphorus trioxide (P
2
O
3
) with cold water produces phosphine gas.
a) True
b) False
3.
Melting point of phosporus acid is 90C
o
.
a) True
b) False
4.
Except oxygen the other members of the group show a covalency of +2, +4 and +6.
a) False
b) True
5.
Sulphur is uncombustible.
a) False
b) True
6.
In contact process 260KJ / mole energy is released during the oxidation of SO
2
to SO
3
in the presence of V
2
O
5
.
a) False
b) True
7.
Boiling point of Te is 1390C
0
.
a) True
b) False
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