Chemical Bonding · JEE Main previous year questions

2006 2 questions

1. Q1002006 · 29 Apr 2006 · Shift 1

   Which of the following sets of ions represents a collection of isoelectronic species?

   1. A.${\mathrm{N}}^{3-},{\mathrm{O}}^{2-},{\mathrm{F}}^{-},{\mathrm{S}}^{2-}$
   2. B.$\mathrm{L}{\mathrm{i}}^{+},\mathrm{N}{\mathrm{a}}^{+},\mathrm{M}{\mathrm{g}}^{2+},\mathrm{C}{\mathrm{a}}^{2+}$
   3. C.${\mathrm{K}}^{+},\mathrm{C}{\mathrm{l}}^{-},\mathrm{C}{\mathrm{a}}^{2+},\mathrm{S}{\mathrm{c}}^{3+}$
   4. D.$\mathrm{B}{\mathrm{a}}^{2+},\mathrm{S}{\mathrm{r}}^{2+},{\mathrm{K}}^{+},\mathrm{C}{\mathrm{a}}^{2+}$
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   Answer: C

2. Q1042006 · 29 Apr 2006 · Shift 1

   The decreasing values of bond angles from $\mathrm{N}{\mathrm{H}}_3(106^{\circ })$ to $\mathrm{Sb}{\mathrm{H}}_3(91^{\circ })$ down group-15 of the periodic table is due to

   1. A.increasing bp-bp repulsion
   2. B.increasing p-orbital character in $\mathrm{s}{\mathrm{p}}^3$
   3. C.decreasing lp-bp repulsion
   4. D.decreasing electronegativity
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   Answer: D