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<html><body><h2 id="content-id-7936481520-2"><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-5264907183-3"><b>Question On Chemistry </b></h2>Which of the following metals reacts most vigorously with cold water?
<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 : 29 Seconds </h3></div></div><h2 id="content-id-3081264579-4"><b> Chemistry Questions Options</b></h2><ol><li><p>Cobalt</p>
</li><li><p>Copper</p>
</li><li><p>Sodium</p>
</li><li><p>Iron</p>
</li></ol> <h2 id="content-id-2683157490-5"><b> Chemistry Questions Solution</b></h2><p>The correct answer is <strong>option 3</strong> i.e. <strong>Sodium.</strong></p>

<p>Sodium is a highly reactive alkali metal belonging to <strong>Group 1 of the periodic table.</strong> It reacts violently and exothermically with cold water, melting into a silvery ball and darting across the surface. The vigorous reaction generates highly flammable hydrogen gas and forms an alkaline sodium hydroxide solution;</p>

<p><strong>     2Na + 2H<sub>2</sub>O →  2NaOH + H<sub>2</sub></strong></p>

<p>The heat released is often intense enough to ignite the hydrogen gas with a characteristic <strong>golden-yellow flame</strong>.</p>

<p>Other Options:</p>

<ul>
	<li>
	<p><strong>Cobalt:</strong> Cobalt is a transition metal that exhibits very low reactivity with water at room temperature. It does not react with cold water at all and requires high-temperature steam to undergo a noticeable chemical reaction.</p>
	</li>
	<li>
	<p><strong>Iron:</strong> Iron is another transition metal with low reactivity. It does not react with cold water; however, it reacts slowly with steam at high temperatures to form iron(III) oxide and hydrogen gas, and it undergoes slow oxidation (rusting) in the presence of water and oxygen over time.</p>
	</li>
	<li>
	<p><strong>Copper:</strong> Copper is located near the bottom of the reactivity series, well below hydrogen. Because of its extremely low reactivity, it does not react with cold water, hot water, or steam under any normal conditions.</p>
	</li>
</ul>
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