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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
In a period the value of ionisation potential increases from left to right with breaks where the atoms have some what stable configuration. In this case $N$ has half filled stable orbital. Hence has highest ionisation energy. Thus the correct order is $B < C < O < N$ not $B < C < N < O$

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