MCQ
Correct order of ionic radii of the given species is
- ✓$Nd ^{3+}> Tb ^{3+}> Tm ^{3+}$
- B$Tm ^{3+}> Tb ^{3+}> Nd ^{3+}$
- C$Tb ^{3+}> Nd ^{3+}> Tm ^{2+}$
- D$Tb ^{3+}> Tm ^{3+}> Nd ^{3+}$

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$C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,}{\mathop{\overset{OH}{\mathop{\overset{|\,\,\,\,}{\mathop{C-}}\,}}\,}}\,}}\,C{{H}_{2}}-\underset{C{{H}_{3}}\,}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{3}}$
| List $I$ Vitamin | List $II$ Deficiency disease |
| $A$ Vitamin $A$ | $I.$ Beri-Beri |
| $B$ Thiamine | $II.$ Cheilosis |
| $C$ Ascorbic acid | $III.$ Xeropthalmia |
| $D$ Riboflavin | $IV.$ Scurvy |
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