Which one of the following compounds can exist as cis-trans isomers?
Phosphoric acid ionizes in three steps with their ionization constant values $K_{a_1}, K_{a_2}$ and $K_{a_3}$, respectively, while $K$ is the overall ionization constant. Which of the following statements are true?
A. $\quad \log \mathrm{K}=\log \mathrm{K}_{\mathrm{a}_1}+\log \mathrm{K}_{\mathrm{a}_2}+\log \mathrm{K}_{\mathrm{a}_3}$
B. $\mathrm{H}_3 \mathrm{PO}_4$ is a stronger acid than $\mathrm{H}_2 \mathrm{PO}_4^{-}$and $\mathrm{HPO}_4^{2-}$
C. $K_{a_1}>K_{a_2}>K_{a_3}$
D. $K_{a_1}=\frac{K_{a_3}+K_{a_2}}{2}$
Choose the correct answer from the options given below :
Match List-I with List-II
| List - I (Ion) |
List - II (Group Number in Cation Analysis) |
||
|---|---|---|---|
| A | $\mathrm{Co}^{2+}$ | I | Group-I |
| B | $\mathrm{Mg}^{2+}$ | II | Group-III |
| C | $\mathrm{Pb}^{2+}$ | III | Group-IV |
| D | $\mathrm{Al}^{3+}$ | IV | Group-VI |
Choose the correct answer from the options given below :
Higher yield of NO in $\mathrm{N}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})$ can be obtained at $\left[\Delta \mathrm{H}\right.$ of the reaction $\left.=+180.7 \mathrm{~kJ} \mathrm{~mol}^{-1}\right]$
A. Higher temperature
B. Lower temperature
C. Higher concentration of $\mathrm{N}_2$
D. Higher concentration of $\mathrm{O}_2$
Choose the correct answer from the options given below :