Chemical Bonding · JEE Main previous year questions

2004 4 questions

1. Q1532004 · 24 Apr 2004 · Shift 1

   Which one of the following sets of ions represents the collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

   1. A.${\mathrm{K}}^{+},\mathrm{C}{\mathrm{l}}^{-},\mathrm{M}{\mathrm{g}}^{2+},\mathrm{S}{\mathrm{c}}^{3+}$
   2. B.$\mathrm{N}{\mathrm{a}}^{+},\mathrm{C}{\mathrm{a}}^{2+},\mathrm{S}{\mathrm{c}}^{3+},{\mathrm{F}}^{-}$
   3. C.${\mathrm{K}}^{+},\mathrm{C}{\mathrm{a}}^{2+},\mathrm{S}{\mathrm{c}}^{3+},\mathrm{C}{\mathrm{l}}^{-}$
   4. D.$\mathrm{N}{\mathrm{a}}^{+},\mathrm{M}{\mathrm{g}}^{2+},\mathrm{A}{\mathrm{l}}^{3+},\mathrm{C}{\mathrm{l}}^{-}$
   Show answer

   Answer: C

2. Q1572004 · 24 Apr 2004 · Shift 1

   The correct order of bond angles (smallest first) in ${\mathrm{H}}_2\mathrm{S},\mathrm{N}{\mathrm{H}}_3,\mathrm{B}{\mathrm{F}}_3$ and $\mathrm{Si}{\mathrm{H}}_4$ is

   1. A.${\mathrm{H}}_2\mathrm{S}<\mathrm{Si}{\mathrm{H}}_4<\mathrm{N}{\mathrm{H}}_3<\mathrm{B}{\mathrm{F}}_3$
   2. B.${\mathrm{H}}_2\mathrm{S}<\mathrm{N}{\mathrm{H}}_3<\mathrm{B}{\mathrm{F}}_3<\mathrm{Si}{\mathrm{H}}_4$
   3. C.${\mathrm{H}}_2\mathrm{S}<\mathrm{N}{\mathrm{H}}_3<\mathrm{Si}{\mathrm{H}}_4<\mathrm{B}{\mathrm{F}}_3$
   4. D.$\mathrm{N}{\mathrm{H}}_3<{\mathrm{H}}_2\mathrm{S}<\mathrm{Si}{\mathrm{H}}_4<\mathrm{B}{\mathrm{F}}_3$
   Show answer

   Answer: C

3. Q1582004 · 24 Apr 2004 · Shift 1

   The bond order in NO is 2.5 while that in $\mathrm{N}{\mathrm{O}}^{+}$ is 3. Which of the following statements is true for these two species?

   1. A.Bond length in $\mathrm{N}{\mathrm{O}}^{+}$ is greater than in NO
   2. B.Bond length is unpredictable
   3. C.Bond length in $\mathrm{N}{\mathrm{O}}^{+}$ is equal to that in NO
   4. D.Bond length in NO is greater than in $\mathrm{N}{\mathrm{O}}^{+}$
   Show answer

   Answer: D

4. Q1702004 · 24 Apr 2004 · Shift 1

   Which one the following does not have $\mathrm{s}{\mathrm{p}}^2$ hybridized carbon?

   1. A.Acetone
   2. B.Acetamide
   3. C.Acetonitrile
   4. D.Acetic acid
   Show answer

   Answer: C