501.

XeF₄ has a shape of

• spherical

• trigonal bipyramidal

• square planar

• tetrahedral

In which of the following pairs both molecules do not possess same type of hybridisation?

• CH₄ and H₂O

• PCl₅ and SF₄

• SF₆ and XeF₄

• BCl₃ and NCl₃

If H-X bond length is 2.00 Å. and H-X bond has dipole moment 5.12 x 10^-30 C-m, the percentage of ionic character in the molecule will be

• 100%

• 16%

• 18%

• 20%

(i) H—C—H angle in CH₄
(ii) Cl—B—Cl angle in BCl₃
(iii) F—I—F angle in IF₇ in a plane
(iv) I—I—I angle in I${}_3^{-}$

Increasing order of above bond angles is

• (i) < (ii)< (iii)< (iv)

• (ii)< (i) < (iii)< (iv)

• (iii)< (i)< (ii)< (iv)

• (iv)< (ii) < (i) < (iii)

• ${\mathrm{O}}_2^{2-}< {\mathrm{O}}_2^{-}<{\mathrm{O}}_2 <{\mathrm{O}}_2^{2+}$

• ${\mathrm{O}}_2^{2-}< {\mathrm{O}}_2<{\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{2+}$

• ${\mathrm{O}}_2<{\mathrm{O}}_2^{2-}< {\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{2+}$

• ${\mathrm{O}}_2 <{\mathrm{O}}_2^{2+}<{\mathrm{O}}_2^{2-}< {\mathrm{O}}_2^{-}$

Which of the following is paramagnetic?

• [Ni(CO)₄]²⁺

• [Co(NH₃)₆]²⁺

• [Ni(CN)₄]^2-

• [NiCl₄]^2-

The pair having the similar shape is

• BF₃ and NF₃

• ${\mathrm{BF}}_4^{-} \mathrm{and} {\mathrm{NH}}_4^{+}$

• ${\mathrm{SiCl}}_4 \mathrm{and} {\mathrm{SCl}}_4$

• ${\mathrm{CH}}_3^{+} \mathrm{and} {\mathrm{H}}_3{\mathrm{O}}^{+}$

Which one of the following molecules has zero dipole moment?

• NO${}_2^{+}$

• H₂O

• NH₃

• CO

Pick out the isoelectronic structures from the following

 $$\begin{gathered} {\mathrm{CH}}_3^{+}; {\mathrm{H}}_3{\mathrm{O}}^{+}; {\mathrm{NH}}_3; {\mathrm{CH}}_3^{-} \\ \mathrm{I} \mathrm{II} \mathrm{III} \mathrm{IV} \end{gathered}$$

• I and II

• I and III

• I and IV

• II, III and IV

Which of the following will have the shape of a trigonal bipyramid?

• PF₃Cl₂

• IF₅

• BrF₅

• SbF${}_5^{2-}$