Chemistry - Salt Analysis Question with Solution | TestHub
Compare three alkali metal salts of the composition (where x are three different small integers and M is an alkali metal). To each of the three salts apply some of the following assertions : (a) The O-O bond is characteristic for the anion. (b) The S-S bond is characteristic for the anion. (c) The S-O-S bond is characteristics for the anion. (d) All sulphur atoms are in same oxidation states. (e) In aqueous solution, it is able to oxidise Mn(II) salt to permanganate. (f) It is formed by the reaction of an aqueous solution of sulphite with sulphur. (g) Its aqueous solution dissolves silver bromide. Calculate the value of (P × Q × R). where P = Number assertions correctly applied for M2S2Ox when x = 3 Q = Number assertions correctly applied for M2S2Ox when x = 7 R = Number assertions correctly applied for M2S2Ox when x = 8
Answer:
Solution:
The three salts corresponding to are M₂S₂O₃ (thiosulfate), M₂S₂O₇ (pyrosulfate), and M₂S₂O₈ (peroxodisulfate).
For M₂S₂O₃ (), statements (b), (f), (g) are true (contains S-S bond, made from sulfite + S, dissolves AgBr), so .
For M₂S₂O₇ (), statements (c), (d) are true (contains S-O-S bridge, both sulfur atoms are in the state), so .
For M₂S₂O₈ (), statements (a), (d), (e) are true (contains O-O bond, both sulfur are , oxidizes Mn²⁺ to MnO₄⁻), so .
Thus, the value of .
