Periodic table has different symbols for individual elements which have been discovered till now. As a result, this periodic table is followed internationally as it is approved and doesn't have any flaws.
Thus, we can conclude that out of the given options, they are all recognized internationally is true about the symbols assigned to the elements.
The Ninhydrin test is not effective to detect high molecular weight proteins as the steric hindrance limits the ninhydrin from reaching the α-amino groups.
