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

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
Identify the incorrect order
  • A
    $HF > HCl > HBr > HI$ ; Acidic nature
  • ✓
    $Li^+ (aq) < Be^{+2}(aq.)$ ; hydrated radius
  • C
    $LiF > NaF > KF > RbF$ ; Lattice energy
  • D
    $Cl > F > Br > I ; e^-$ affinity
✓

Answer

Correct option: B.
$Li^+ (aq) < Be^{+2}(aq.)$ ; hydrated radius
b
$(b)$ Sum of oxidation numbers of all atoms in a neutral molecule is zero.
$\to A_3(B_4C)_2 : +2 \times 3 +2 \times [ 4 \times 5 -2] = 42 \neq 0$
$\to A_3(BC_4)_2 : +2 \times 3 +2 \times [ +5 -8) = 0$
$\to A_2(BC_3)_2 : +2 \times 2 + 2 \times [+5 -6) = +2 \neq 0$
$\to ABC_2 : +2 +5 +(-2) \times  2 = +3 \neq 0$

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