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BITSAT 2017
Exam
BITSAT
Year
2017
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

BITSAT 2017 · Chemistry · Chemical Bonding and Molecular Structure

Which of the following are isoelectronic species? I. + C H _ 3 II....

Which of the following are isoelectronic species?

I. C+H3\overset{+}{C}{H}_{3}

II. NH2−{NH}_{2}^{-}

III. NH4+{NH}_{4}^{+}

IV. NH3{NH}_{3}

Options

  1. AI,III, II and IIIIII
  2. BII,IIIII, III and IVIV
  3. CI,III, II and IVIV
  4. DIIII and II

Correct answer

B. II,IIIII, III and IVIV

Step-by-step solution

I. Number of electrons in C+H3=6+3−1=8\overset{+}{C}{H}_{3} = 6 + 3 - 1 = 8

II. Number of electrons in NH2−=7+2+1=10{NH}_{2}^{-} = 7 + 2 + 1 = 10

III. Number of electrons in NH4+=7+4−1=10{NH}_{4}^{+} = 7 + 4 - 1 = 10

IV. Number of electrons in NH3=7+3=10{NH}_{3} = 7 + 3 = 10

Since, species with same number of electrons are called isoelectronic species, Hence, IInd,IIIrdIInd, IIIrd and IVthIVth are isoelectronic.

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