3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The law of triads is applicable to a group of
✓
$Cl, Br, I$
B
$C, N, O$
C
$Na, K, Rb$
D
$H, O, N$
✓
Answer
Correct option: A.
$Cl, Br, I$
a According to the law of triads the atomic $wt$ of the middle element is arithmatic mean of $I$ and $III.$
At wt of $Br = \frac{At.\,wt\, of\, Cl + At\, wt\, of\, I}{2}$
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