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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Which of the following statements $(s)$ is (are) correct
  • A
    The electronic configuration of $Cr$ is $[Ar]\,3{d^5}4{s^1}$ (Atomic no. of $Cr = 24$)
  • B
    The magnetic quantum number may have a negative value
  • C
    In silver atom, $23$ electrons have a spin of one type and $24$ of the opposite type (Atomic no. of $Ag = 47$)
  • ✓
    $A$ , $B$ or $C$ 
✓

Answer

Correct option: D.
$A$ , $B$ or $C$ 
d
(d) The oxidation state of nitrogen in $H{N_3}$ is $\, - \frac{1}{3}.$

$H{N_3}$: $1 + 3x = 0$ ==> $3x = - 1$ or $x = \frac{{ - 1}}{3}$

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