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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
Which of these statements is not true
  • ✓
    $NO^+$ is isoelectronic with $O_2$
  • B
    $B$ is always covalent in its compounds
  • C
    In aqueous solution, the $Ti^+$ ion is much more stable than $Ti (III)$
  • D
    $LiAlH_4$ is a versatile reducing agent in organic synthesis
✓

Answer

Correct option: A.
$NO^+$ is isoelectronic with $O_2$
a
$(a)\, NO^+\, =7+8-1\,=14\,e^-$. $O_2\, = 16\,e^-$. i.e. not isoelectronic
$(b)$ Boron forms only covalent compounds. This is due to its extremely high ionisation energy.
$(c)$ Compounds of $Ti^+$ are much more stable than those of $Ti^{3+}$.
$(d)\, LiAlH_4$ is a versatile reducing agent in organic synthesis

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