CBES Board Class 10/ENVIRONMENTAL CHEMISTRY I ATMOSPHERE MCQS MCQs :- multiple choice questions and answers. e.g CBES Board Class 10 MCQS,CBES Board Class 10 Mock Tests , CBES Board Class 10 Practice Papers ,CBES Board Class 10 Sample Test,CBES Board Class 10 Sample questions

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Question 1: Which of the following makes up most of the air?

nitrogen

oxygen

carbon dioxide

helium

Total MCQS Questions are 46 in this paper ENVIRONMENTAL CHEMISTRY I ATMOSPHERE MCQS
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