Question

Match the elements given in Column I with the properties mentioned in Column II.
`{:(Column I,Column II),(A.Li,1."Insoluble sulphate"),(B.Na,2."Strongest monoacidic base"),(C.Ca,3."Most negative" E^(Theta) "value among alkali metals"),(D.Ba,4."Insoluble oxalate"),(,5.6s^(2)"outer electronic configuration"):}`

Answer 1

Correct Answer - A. `rarr(3)` B. `rarr(2)` C. `rarr(4)` D. `rarr(5)`
A. `Li-`Most negative `E^(-)` among alkali metals [Due to very high hydration energy the resulting `E^(Theta)` is most negative]
B. Na-Strongest monoacidic base [Alkalies are more acidic than alkaline earth metals. LiOh has covalent character].
C-Ca insoluble oxalate [Calcium oxalate is insoluble in water]
D. Ba-Insoluble sulphate [Hydration energy decreases as size of cation increases].
`6s^(2)` outer electronic configuration. `._(56)Ba = 1s^(2),2s^(2),2p^(6),3s^(2),3p^(6),3d^(10),4s^(2),4p^(6),4d^(10),5s^(2),5p^(6),6s^(2)]`