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(a) Which poisonous gas is evolved when white phosphorus is heated with conc.NaOH solution? Write the chemical equation involved.
(b) Which noble gas has the lowest boiling point?
(c) Fluorine is a stronger oxidizing agent than chlorine. Why?
(d) What happens when H3PO3 is heated?
(e) Complete the equation :
PbS+O3

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Solution

(a) Phosphine

P4(s)+3NaOH(aq)+3H2O(l)3NaH2PO2(aq)Sodiumhypophosphite+PH3(g)Phosphine

(b) Helium

(c) The electrode potential of F2 and Cl2 are:
F2+2e2F;E=+2.87V
Cl2+2e2Cl;E=1.36V
Since E for F2/F is higher than that of Cl2/Cl, therefore, F2 is more easily reduced than Cl2. As a result, F2 is stronger oxidising agent than Cl2.

(d) It undergoes disproportionation to form PH3 and H3PO4.
4H3PO3ΔPH3Phosphine+3H3PO4Orthophosphoric acid
(e)PbS+4O3PbSO4+4O2

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