There are some deposite of nitrates and phosphates in earth crust Nitrates are more soluble in water .Nirates are difficult to reduce under the laborat ory conditions bu microbes do it easily Ammonia forms alrge number of complexes with transition metal ions hybridization easily explains the ease of sigma donation capability of $N{H}_3\text{and}P{H}_3$ phosphine is a flammable gas and is prepared form whit e phosphorous
Among the following the correct statement is

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