Compounds of phosphorous

A compound of phosphorous and sulphur contains 1.24gm of phosphorous in 2.2 gm of the compound. The formula of the compound is

Which of the following statement is false. (1) Kjeldhal's method is used for estimation of N-element in organic compounds. (2) Carius method is used for Estimation of N-element. (3) Carius method is used for estimation of sulphur in organic compounds. (4)Phosphorous is present in organic compound is oxidized to H_3PO_4 then precipitated by magnesia mixture in form of Mg_2P_2_O_7 .

A linear chain compound 'A' (C_(5)H_(10)O_(2)) gives brisk effervescence of CO_(2) when treated with saturated aqueous NaHCO_(3) solution. It reacts with chlorine gas in the presence of catalytic amount of red phosphorous to give compound 'B' . Identify compound 'A' and 'B' . Identify the chiral isomer of compound 'A'/

The correct statement(s) related to oxoacids of phosphorous is(are)

The reaction of white phosphorous with aqueous NaOH gives phosphine along with another phosphorous containing compound. The reason type , the oxidation state of phosphorous in phosphine and in the other products are, respectively,

Which is not a reservoir for phosphorous in phosphorous cycle?