UPSC Combined Geo-Scientist, Mains · 2019 · Mains Paper I

Q3(a). Structures and pKa order of H₃PO₄, H₃PO₃ and H₃PO₂

10 marks
Topic: Outside the listed units
Question only

Question

Draw the molecular structures of H₃PO₄, H₃PO₃ and H₃PO₂. Arrange them in accordance with their pKa values.

Model answer

The free solution for 2019 answers questions 1, 2, 4, 6, 9 and 11, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Coversoxoacids of phosphorusH3PO3H3PO2pKa

All parts of Question 3

3(a) Structures and pKa order of H₃PO₄, H₃PO₃ and H₃PO₂10 marks
3(b) Borazine: inorganic benzene, resonance and reactivity10 marks
3(c) Copper wire in silver nitrate solution5 marks
3(d) Stability of +3 state of Al, Ga, In and Tl from E° values5 marks