Which is the donor atom in sulphur trioxide?
S
O
H
None of these
Which one of the following is smallest in size?
Na
Na+
K
Br-
Which one of the following is an electron deficient compound?
CH4
H2O
BF3
HF
How many electrons are needed for oxygen atoms to attain octet electronic configuration in its valence shell?
1
3
2
5
Which is a good conductor of electricity?
NH3
Solid NaCI
Diamond
Molten KCI
Which one of the following can easily become a cation?
CI
N
Ca
F
How many electrons are present in the valence shell of sulphur?
6
7
Which one of the following do not have an octet valence shell electronic configuration?
O2-
Ne
S-
17th group elements are also known as
Chalcogens
Noble gases
Halogens
Alkaline earth metals
Which one is least electronegative?
Cs
Mg
