Which among the following electronic configurations belong to main group elements?
A. $[\mathrm{Ne}] 3 \mathrm{~s}^1$
B. $[\operatorname{Ar}] 3 \mathrm{~d}^3 4 \mathrm{~s}^2$
C. $[K r] 4 d^{10} 5 s^2 5 p^5$
D. $[\operatorname{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^1$
E. $[R n] 5 f^0 6 d^2 7 s^2$
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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. $K_{a_1}=\frac{K_{a_3}+K_{a_2}}{2}$
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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 |
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