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IIT JEE Advanced 2008 Paper 1

Paragraph for Questions 44–46:
There are some deposits of nitrates and phosphates in earth’s crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms larger number of complexes with transition metal ions. Hybridisation easily explains the ease of sigma donation capability of NH3 and PH3. Phosphine is a flammable gas and is prepared from white phosphorus.

Question : 45

Total: 69

Among the following, the correct statement is

between NH3 and PH3,NH3 is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.
between NH3 and PH3,PH3 is a better electron donor because the lone pair of electrons occupies sp3 orbital and is more directional.
between NH3 and PH3,NH3 is a better electron donor because the lone pair of electrons occupies sp3 orbital and is more directional.
between NH3 and PH3,PH3 is a better electron donor because the lone pair of electrons occupies spherical s orbital and is less directional.

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