Pick out correct statements

Options

A. Equivalent weight of an element will change with valency
B. In 109% `H_(2)SO_(4)` labelled oleum in the precent of free `SO_(3)` is 60%
C. Metathesis reaction are redo reactions
D. Product of volume in ml and normality of solution gives number of milliequivalent of solute

Answer

A, D

Explanation

a) Eqwt of `Cu^(+)=(63.5)/(1)=63.5`
Energy `Cu^(++)=(63.5)/(2)=31.75`
b) 100g oleum `+9g H_(2)O`
`SO_(3)+H_(2)OrarrH_(2)SO_(4)`
`{:(80g,189),(40g,9g):}`
% of free `SO_(3)=40%`
c) The other name for double decomposition reactions are metathesis reaction. They are not redox reaction.
d) Correct statement.