Which of the following options represents the product(s) of the reaction given below?$$ ext{MnO}_2 + 4 ext{H

Question

Which of the following options represents the product(s) of the reaction given below?$$	ext{MnO}_2 + 4	ext{HCl} ightarrow$$

Examoogle · Accepted Answer

The correct answer is Option B: $	ext{MnCl}_2, 	ext{Cl}_2 	ext{ and } 2	ext{H}_2	ext{O}$. When manganese dioxide ($MnO_2$) reacts with concentrated hydrochloric acid ($HCl$), it undergoes a redox reaction producing manganese chloride ($MnCl_2$), chlorine gas ($Cl_2$), and water ($H_2O$).

Step-by-Step Solution & Concepts:
When manganese dioxide ($MnO_2$) reacts with concentrated hydrochloric acid ($HCl$), it undergoes a redox reaction producing manganese chloride ($MnCl_2$), chlorine gas ($Cl_2$), and water ($H_2O$).

Working Principle: In this redox reaction, manganese dioxide acts as a strong oxidizing agent. The $Mn^{4+}$ in $MnO_2$ is reduced to $Mn^{2+}$ (forming $MnCl_2$), while the chloride ions ($Cl^-$) from $HCl$ are oxidized to elemental chlorine gas ($Cl_2$). Water ($H_2O$) is also formed as a byproduct due to the combination of hydrogen ions and oxygen.

Key Formulas: $MnO_2 + 4HCl ightarrow MnCl_2 + Cl_2 + 2H_2O$ — Overall balanced chemical equation; Oxidation: $2Cl^- ightarrow Cl_2 + 2e^-$ — Chloride ion oxidation; Reduction: $MnO_2 + 4H^+ + 2e^- ightarrow Mn^{2+} + 2H_2O$ — Manganese dioxide reduction

Key Points: Manganese dioxide ($MnO_2$) is a dark brown/black solid acting as a powerful oxidizing agent.; Hydrochloric acid ($HCl$) acts as a reducing agent in this reaction.; Chlorine gas ($Cl_2$) evolved is greenish-yellow in color and has a pungent, suffocating odor.; This reaction is commonly used in laboratory preparation of chlorine gas.

Advantages: Simple and effective laboratory method for producing chlorine gas.; Demonstrates classic redox chemistry and transition metal oxidation states.

Disadvantages: Requires heating for a vigorous reaction.; Chlorine gas is toxic and must be handled in a well-ventilated fume hood.

Applications: Laboratory generation of chlorine gas; Industrial bleaching powder preparation (via chlorine generation)

Additional Info: Manganese exhibits an oxidation state of +4 in $MnO_2$ and +2 in $MnCl_2$.. Option B correctly lists all three products: manganese chloride, chlorine gas, and water.

Answer: B is correct — The reaction between manganese dioxide and hydrochloric acid yields manganese chloride, chlorine gas, and water ($MnCl_2, Cl_2 	ext{ and } 2H_2O$).

Exam Tip: Remember that metal oxides reacting with acids typically form salt and water, but metal oxides with strong oxidizing properties like $MnO_2$ also release non-metal gases such as $Cl_2$ when reacting with halogen acids.

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