1. Tardigrade
  2. Question
  3. Chemistry
  4. How many of the following sets represent Dobereiner's triads? text i. P,As,Bi text ii. Ca,Sr,Ba text iii. Cl,Br,I text iv. Li,Na,K

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. How many of the following sets represent Dobereiner's triads?
$\text{ i. }P,As,Bi$
$\text{ ii. }Ca,Sr,Ba$
$\text{ iii. }Cl,Br,I$
$\text{ iv. }Li,Na,K$

NTA AbhyasNTA Abhyas 2022

Solution:

According to Dobereiner, the middle element have an atomic mass almost the average of the other two elements. Sets $ii,iii$ and $iv$ satisfy this conditions and hence, they represent Dobereiner's triads.