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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Incorrect statements among the following is/are
  • A
    $2^{nd}$ electron gain enthalpy is always endothermic
  • B
    Electronegativity is the property of bonding atoms
  • ✓
    $Al_2O_3$ and $BeO$ are amphoteric oxide
  • D
    None of these are incorrect
✓

Answer

Correct option: C.
$Al_2O_3$ and $BeO$ are amphoteric oxide
c
A is acidic so it belongs to the right side of table and $X$ belongs to the left side of table.

The electronegativities decrease from $X$ to $Y$ to $Z$.

The atomic radius increases in the order $X , Y$ and $Z$ and $X , Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.

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