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STD 11 - 3. Classification of elements and periodicity in properties — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
Select the incorrect statement
  • A
    $s-$ block metal oxides are basic in nature except $BeO$ which is amphoteric.
  • B
    Non metal oxides are acidic in nature (except $NO, N_2O, CO, H_2O$)
  • C
    In $d-$ block all elements are metals
  • ✓
    $d-$ block metal oxides are only basic in nature
✓

Answer

Correct option: D.
$d-$ block metal oxides are only basic in nature
d
In ionic compounds as internuclear distance increases, the melting point decreases so as we move down the group, the melting point decreases.

So, as $r_c+r_a$ is greater for $RbBr$ than for $NaF$ so $NaF$ have higher melting point.

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