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<html><body><h2 id="content-id-6351427098-2"><b>Science Questions Overview</b></h2><p>Science Questions have a good weightage in the Ssc Cgl Exam and the type of question asked in Ssc Cgl 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 Science Questions.</p><h2 id="content-id-3795481026-3"><b>Question On Science </b></h2>The fractional atomic mass of chlorine is due to which of the following?
<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-9843250176-4"><b> Science Questions Options</b></h2><ol><li><p>Experimental error</p>
</li><li><p>Presence of ions</p>
</li><li><p>Its compound nature</p>
</li><li><p>Presence of isotopes</p>
</li></ol> <h2 id="content-id-6280145973-5"><b> Science Questions Solution</b></h2><p>The correct answer is <strong>option 4</strong> i.e. <strong>Presence of isotopes.</strong></p>

<p>The fractional atomic mass of chlorine (<strong>35.5 u</strong>) arises because natural chlorine exists as a mixture of two main isotopes: <strong>chlorine-35</strong> and <strong>chlorine-37</strong>, which occur in an approximate <strong>3:1 ratio</strong>.</p>

<p>The atomic mass of chlorine is determined by calculating the <strong>weighted average</strong> of the masses of these isotopes according to their relative abundance:</p>

<p style="text-align:center"><strong>Average Mass = ((35×3) + (37×1))/4 = 35.5 u</strong></p>

<p>Therefore, the fractional atomic mass is not the result of experimental error or the chemical properties of chlorine. Instead, it occurs because the atoms of chlorine contain <strong>different numbers of neutrons</strong> in their nuclei.</p>
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