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Question

(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
 


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

Chemistry

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