MCQ
A sodium cation has a different number of electrons from
- A${O^{2 - }}$
- B${F^ - }$
- ✓$L{i^ - }$
- D$A{l^{3 + }}$
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| Column-$I$ | Column-$II$ (Shape) |
| $(A) \,SF_4$ | $(1)$ Tetrahedral |
| $(B)\, BrF_3$ | $(2)$ Pyramidal |
| $(C)\, BrO_3^-$ | $(3)$ Sea-Saw shaped |
| $(D)\, NH_4^+$ | $(4)$ Bent $T-$ shaped |
$\left[\right.$ Given : $pK _{ b }\left( NH _3\right)=4.745$
$\log 2=0.301$
$\log 3=0.477$
$T =298\,K ]$

Assertion $A$ : Thin layer chromatography is an adsorption chromatography.
Reason $R$: A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent. In the light of the above statements, choose the correct answer from the options given below.