Question

CI, Br, I, if this is Dobereiner's triad and the atomic masses
of Cland I are 35.5 and 127 respectively the atomic mass of
Br is
(a) 162.5
(b) 91.5
(c) 81.25
(d) 45.625
If the two members of a Dobereiner triad are phosphoru
and antimony, the third member of this triad is
(a) arsenic
(b) sulphur
(c) iodine
(d) calcium
The law of triads is applicable to a group of
C) NO
3.
4.​

Answer 1

Answer:

81.25 (c)............

Answer 2

Answer:

1)c)81.25 take the arithmetic of given two elements