Question

List any two observations which post a challenge to mendel's periodic law

Answer 1

The observations which posed a challenge to Mendeleev periodic table are ;
- Position of hydrogen in the first group among metal though it is non-metal.
- Placing the elements with higher Atomic mass before the elements with lower Atomic mass.
- No places were left in between two groups for isotopes.

Answer 2

Explanation:

one mole of peroxodisulphuric acid produces. ... Of sulphuric acid, 1mol. Of peroxomono sulphuric acid, and 1mol. Of hydrogen peroxide.

Hydrolysis of one mole of peroxodisulphuric

acid produces. ... Of sulphuric acid, 1mol. Of peroxomono sulphuric acid, and 1mol. Of hydrogen peroxide.