Question

I⁻reacted with KMnO₄ in presence of aq KOH to form (A) + (B). (B) is brown black in color whereas (A) is the conjugate base of an acid (C). The anhydride of acid (C) reacts with a neutral gas (D), a method used for estimation (of gas D), to form a volatile solid (E) and gas (F). Then find the mass of (F).

Answer 1

Hint : Iodine is a chemical element with atomic number 53 and the symbol I. At normal conditions, it exists as a lustrous, purple-black non metallic solid that melts to form a deep violet liquid at 114 degrees Celsius and boils to form a violet gas at 184 degrees Celsius.

Complete Step By Step Answer:
Potassium permanganate is commonly used as a potent oxidising agent in the chemical industry and laboratories, as well as a treatment for dermatitis, wound cleaning, and general disinfection.
Iodine is a chemical element with atomic number 53 and the symbol I. At normal conditions, it exists as a lustrous, purple-black non metallic solid that melts to form a deep violet liquid at 114 degrees Celsius and boils to form a violet gas at 184 degrees Celsius.
In the presence of KOH, the reaction between I⁻ and KMnO₄ is given as:
${I^ - }\; + {\text{ }}6KMn{O_4}\; + 6KOH\; \to \;6{K_2}Mn{O_4}\;\left( B \right){\text{ }} + \;I{O_3}^ - \left( A \right){\text{ }} + 3{H_2}O.$
B is K₂MnO₄ (Potassium Manganate)
The inorganic compound potassium manganate has the formula K₂MnO₄. This green-colored salt is used as a step in the production of potassium permanganate, a popular chemical.
A is IO₃⁻ (iodate ion)
Iodate is a monovalent inorganic anion and an iodine oxoanion. It's an iodic acid's conjugate base.
The conjugate acid of IO₃⁻ is HIO₃
C is HIO₃ (Iodic acid)
HIO₃ is iodic acid. It's a water-soluble white solid. Its stability compares with that of chloric and bromic acids, which are also unstable. Iodic acid is one of the most stable halogen oxo-acids, with iodine in the oxidation state +5.
Anhydride of HIO₃ is I₂O₅
D is I₂O₅ (Iodine pentoxide)
The chemical compound I₂O₅ stands for iodine pentoxide. This is the only stable iodine oxide, since it is the anhydride of iodic acid. It's made by dehydrating iodic acid in a stream of dry air at 200°C.
Upon estimating CO,
${I_2}{O_5} \to {I_2}(E) + 5C{O_2}(F)$
E is I₂ (Iodine Gas)
Iodine is a chemical element with atomic number 53 and the symbol I. At normal conditions, it exists as a lustrous, purple-black non metallic solid that melts to form a deep violet liquid at 114 degrees Celsius and boils to form a violet gas at 184 degrees Celsius.
F is CO₂ (Carbon dioxide)
Carbon dioxide (CO₂) is an acidic, colourless gas with a density that is around 53% greater than that of dry air. A carbon atom is covalently double bonded to two oxygen atoms in a carbon dioxide molecule. It is found as a trace gas in the Earth's atmosphere.

Note :
Iodine is a chemical element with atomic number 53 and the symbol I. At normal conditions, it exists as a lustrous, purple-black non metallic solid that melts to form a deep violet liquid at 114 degrees Celsius and boils to form a violet gas at 184 degrees Celsius.