The bond angles of ${\mathrm{NH}}_3 > {\mathrm{NH}}_4^{+} \mathrm{and} {\mathrm{NH}}_2^{-}$ are in the order

• ${\mathrm{NH}}_2^{-} > {\mathrm{NH}}_3 > {\mathrm{NH}}_4^{+}$

• ${\mathrm{NH}}_4^{+} >{\mathrm{NH}}_3 > {\mathrm{NH}}_2^{-}$

• ${\mathrm{NH}}_3>{\mathrm{NH}}_2^{-} >{\mathrm{NH}}_4^{+}$

• $\mathrm{NH} > {\mathrm{NH}}_4^{+} > {\mathrm{NH}}_2^{-}$

Amongest NO${}_3^{-}$, AsO${}_3^{3-}$-, CO${}_3^{2-}$, ClO${}_3^{-}$, SO${}_3^{2-}$ and BO${}_3^{3-}$, the non-planar species are

• CO${}_{\mathrm{}}^{$ {}_3^{2-}$}$

• AsO${}_3^{3-}$, ClO${}_3^{-}$ and SO${}_3^{2-}$

• NO${}_3^{-}$, CO${}_3^{2-}$ and BO${}_3^{3-}$

• SO${}_3^{2-}$, NO${}_3^{-}$ and BO${}_3^{3-}$

Iodine is formed when potassium iodide reacts with a solution of

• ZnSO₄

• CuSO₄

• (NH₄)₂SO₄

• Na₂SO₄

Which of the following hydrogen bonds are strongest in vapour phase?

• HF..........HF

• HF..........HCl

• HCl..........HCl

• HF..........HI

Compound A and B are treated with dil. HCl separately. The gases liberated are Y and Z respectively. Y turns acidified dichromate paper green while Z turns lead acetate paper black. The compound A and B are respectively.

• Na₂CO₃ and NaCl

• Na₂SO₃ and Na₂S

• Na₂S

• Na₂SO₄

Fluorine reacts with dilute NaOH and forms a gaseous. product A. The bond angle in the molecule of A is

• 104°40'

• 103°

• 107°

• 109°28'

The number of $\mathrm{p\pi }-\mathrm{d\pi }$ 'pi' bonds present in XeO₃ and XeO₄ molecules, respectively are

• 3,4

• 4,2

• 2,3

• 3,2

68.

The type of bonds present in sulphuric anhydride are

• $3\mathrm{\sigma } \mathrm{and} \mathrm{three} \mathrm{p\pi }-\mathrm{p\pi }$

• $3\mathrm{\sigma }, \mathrm{one} \mathrm{p\pi }-\mathrm{p\pi } \mathrm{and} \mathrm{two} \mathrm{p\pi }-\mathrm{p\pi }$

• $2\mathrm{\sigma } \mathrm{and} \mathrm{three} \mathrm{p\pi }-\mathrm{d\pi }$

• $2\mathrm{\sigma } \mathrm{and} \mathrm{two} \mathrm{p\pi }-\mathrm{d\pi }$

Which pair of oxyacids of phosphorus contains 'P - H' bonds?

• H₃PO₄, H₃PO₃

• H₃PO₅, H₄P₂O₇

• H₃PO₃, H₃PO₂

• H₃PO₂, HPO₃

$\mathrm{Cl}-\mathrm{P}-\mathrm{Cl}$ bond angles in PCl₅ molecule are

• 120° and 90°

• 60° and 90°

• 60° and 120°

• 120° and 30°