Which of the following statements are correct?

For zero order (K)$=\frac{\mathrm{x}}{\mathrm{t}}$

Half life$\left(\frac{{\mathrm{t}}_1}{2}\right)=\stackrel{\frac{t_1}{2}}{\to }75\%$

$0\stackrel{\frac{{\mathrm{t}}_1}{2}}{\to }50\%\stackrel{\frac{{\mathrm{t}}_1}{2}}{\to }75\%$

(1) Time required for75% completion is 1.5 times if half fir zero order reaction.

(2) Time needed for a definite of $1^{\mathrm{st}}$  order reaction does not very with the initial concentration

(3) Time for 25% reaction is one-third of half-life in second order reaction process.

$\mathrm{t}=\frac{1}{\mathrm{K}}\frac{\mathrm{x}}{\mathrm{a}(\mathrm{a}-\mathrm{x})}$

$\mathrm{x}=\frac{25\mathrm{a}}{100}$

$=\frac{1}{\mathrm{K}}\frac{{\displaystyle \frac{25\mathrm{a}}{100}}}{\mathrm{a}\left[\mathrm{a}-{\displaystyle \frac{25\mathrm{a}}{100}}\right]}$

$=\frac{1}{\mathrm{K}}\frac{{\displaystyle \frac{25\mathrm{a}}{100}}}{\mathrm{a}\left[{\displaystyle \frac{100\mathrm{a}-25\mathrm{a}}{100}}\right]}$

$=\frac{1}{\mathrm{Ka}}\frac{25\mathrm{a}}{100}\mathrm{x}\frac{100}{75\mathrm{a}}$

$\frac{1}{3\mathrm{Ka}}$

$\mathrm{t}=\frac{1}{3}\left(\raisebox{1ex}{${\mathrm{t}}_1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.\right)$

$\left(4\right)r=K{\left[A\right]}^1$

${\mathrm{r}}^1=\mathrm{K}{\left[2\mathrm{A}\right]}^1$

${\mathrm{r}}^1=\mathrm{Kx}2{\left[\mathrm{A}\right]}^1$

${\mathrm{r}}^1=2\mathrm{r}$