Embibe Experts Solutions for Chapter: Redox Reactions, Exercise 1: BITSAT 2017

$0.45 \mathrm{g}$ acid of molecular mass $90$ was neutralise by $20$ $\mathrm{ml}$ of $0.5 \mathrm{N} \mathrm{KOH}$. The basicity of the acid is

Which of the following statement is incorrect regarding the equation
$\mathrm{MeCHO}+{\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]}^{+}+\overline{\mathrm{O}}\mathrm{H}⟶{\mathrm{MeCOO}}^{-}+\mathrm{Ag}$

$4 \mathrm{g}$ of copper was dissolved in $\mathrm{conc}.{\mathrm{HNO}}_3$. The copper nitrate thus obtained gave $5 \mathrm{g}$ of its oxide on strong heating the equivalent weight of copper is