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 large number of complexes with transition metal ions. Hybridization easily explains the ease of sigma donation capability of NH 3 and PH 3 . Phosphine is a flammable gas and is prepared from white phosphorous.
(i) Among the following, the correct statement is :
( a) phosphates have no biological significance in humans.
Text Solution
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(i) Because of following two reasons, the nitrates are less abundant in earth crust.
(i) Nitrates have greater solubility in water.
(ii) Nitrates are prone to microbial action.
(ii) NH 3 is better electron donor as the lone pair of electrons are present in diffued and more directional sp 3 hybridised orbital. In PH 3 the lone pair of electrons is supposed to be present in more concentrated s-orbital which is closer to the nucleus. As a result the donation of electron pair is some what difficult.
(iii) It is disproportionation reaction,
+ 3NaOH + 3H 2 O ⎯→ 3NaH 2 
O 2 + 
H 3 (iv) P 4 + 3O 2 
P 4 O 6 . Here nitrogen acts as diluent.
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