Which of the following is / are correct statement?

$\Rightarrow$  Rate constant increases on increasing temperature hence rate of reaction also increases
$\Rightarrow$Rate of reaction may decrease on increasing concentration of reactant if order with respect to reactant   is negative.
$\Rightarrow$Schottky and frenkel defects are found in ionic solids.
$\Rightarrow$ On heating
 $ZnO\to Z{n}^{2+}+\frac{1}{2}{O}_2+2e^{-}$
It turns yellow from while due to metal excess defects.