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<h2>HL Paper 1</h2><div class="question">
<p><span style="background-color: #ffffff;">What is the major reason why the pH of unpolluted rain is less than 7?</span></p>
<p><span style="background-color: #ffffff;">A. methane</span></p>
<p><span style="background-color: #ffffff;">B. carbon dioxide</span></p>
<p><span style="background-color: #ffffff;">C. nitrogen oxides</span></p>
<p><span style="background-color: #ffffff;">D. sulfur dioxide</span></p>
</div>
<h2 style="margin-top: 1em">Markscheme</h2>
<div class="question">
<p>B</p>
</div>
<h2 style="margin-top: 1em">Examiners report</h2>
<div class="question">
<p>69 % of the candidates identified CO2 as the gas responsible for the acidity of unpolluted rain. The majority of the candidates that answered incorrectly chose nitrogen oxides (C) or sulfur dioxide (D).</p>
</div>
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