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<html><body><h2 id="content-id-9742538610-2"><b>Chemistry Questions Overview</b></h2><p>Chemistry Questions have a good weightage in the Ssc Chsl Exam and the type of question asked in Ssc Chsl exam is similar to the question mentioned below. It has been solved and explained by KD Live Experts under the guidance of Neetu Mam and they have tried to elaborate the concept used in Chemistry Questions.</p><h2 id="content-id-0759348126-3"><b>Question On Chemistry </b></h2>Which substance is the primary component of the reddish-brown coating formed on iron articles exposed to moist air?
<div class="row show--dificulty--bar" style="margin-top:8px;"><div class="col-sm-6 show--dificulty--bar" style="display:inline-flex !important;border-right:0.1px solid #eee;"><h3 style="font-size:12px !important;">Difficulty : Easy </h3></div><div class="col-sm-6 show--dificulty--bar" style="display:inline-flex;"><h3 style="font-size:12px !important;"> Average Time : 31 Seconds </h3></div></div><h2 id="content-id-6543128097-4"><b> Chemistry Questions Options</b></h2><ol><li><p>Iron Sulfate (FeSO<sub>4</sub>)</p>
</li><li><p>Iron (II) Oxide (FeO)</p>
</li><li><p>Iron (III) Hydroxide (Fe(OH)<sub>3</sub>)</p>
</li><li><p>Hydrated Iron (III) Oxide (Fe<sub>2</sub>O<sub>3</sub>·xH<sub>2</sub>O)</p>
</li></ol> <h2 id="content-id-8519407632-5"><b> Chemistry Questions Solution</b></h2><p>The correct answer is <strong>option 4</strong> i.e. <strong>Hydrated Iron (III) Oxide (Fe<sub>2</sub>O<sub>3</sub>·xH<sub>2</sub>O)</strong>.</p>

<p>When iron articles are exposed to moist air containing oxygen and water vapor, a slow <strong>chemical reaction called corrosion or rusting occurs</strong>. Iron reacts with atmospheric oxygen in the presence of water to form a flaking, reddish-brown substance known as rust. The <strong>"x.H<sub>2</sub>O</strong>" in the chemical formula signifies a variable amount of water molecules associated with each unit of iron oxide, depending on the ambient humidity levels.</p>
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