Neet 2025 PYQ

Consider the following compounds: $\underline{\text{K}}{\text{O}}_2$, ${\text{H}}_2{\underline{\text{O}}}_2$ and ${\text{H}}_2\underline{\text{S}}{\text{O}}_4$. The oxidation states of the underlined elements in them are, respectively:

If the half-life ($t_{1/2}$) for a first order reaction is $1$ minute, then the time required for $99.9\%$ completion of the reaction is closest to:

The correct order of the wavelength of light absorbed by the following complexes is,A. $[\text{Co}({\text{NH}}_3{)}_6{]}^{3+}$ B. $[\text{Co}(\text{CN}{)}_6{]}^{3-}$ C. $[\text{Cu}({\text{H}}_2\text{O}{)}_4{]}^{2+}$ D. $[\text{Ti}({\text{H}}_2\text{O}{)}_6{]}^{3+}$ Choose the correct answer from the options given below:

Which one of the following compounds can exist as cis-trans isomers?

Phosphoric acid ionizes in three steps with their ionization constant values $K_{a1}$, $K_{a2}$ and $K_{a3}$, respectively, while $K$ is the overall ionization constant. Which of the following statements are true?A. $\log K=\log K_{a1}+\log K_{a2}+\log K_{a3}$ B. ${\text{H}}_3{\text{PO}}_4$ is a stronger acid than ${\text{H}}_2{\text{PO}}_4^{-}$ and ${\text{HPO}}_4^{2-}$ C. $K_{a1}>K_{a2}>K_{a3}$ D. $K_{a1}=\frac{K_{a3}+K_{a2}}{2}$ Choose the correct answer from the options given below: