Inorgnaic chemistry

1.     Which of the following can displace other three elements?

a)     Fluorine

b)    Chlorine

c)     Bromine

d)    Iodine

2.     Which of the following statement is incorrect about halogens?

a)     All are non-metals

b)    All the halogens have electronic configuration ns₂p₅

c)     They have high electron affinity and ionization energy

d)    All the halogens react with noble gases to form their halides

3.     The chemical formula of sodium hypochlorite is

a)     NaClO

b)    NaClO₂

c)     NaClO₃

d)    NaClO₄

1.a

2.d

3.a