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Q21. Which one among the following methods is not effective in removing arsenic from contaminated ground water?
Q22. Which one of the following is also called stranger gas?
Q23. Which one of the following is a major constituent of biogas?
Q24. For which one of the following is the density maximum?
Q25. White Phosphorus glows in the dark due to
Q26. How many elements are there in the 5th Period of Modern Periodic Table?
Q27. Which one of the following materials is suitable for water purification?
Q28. Ammonia (NH3) obtained from different sources always has same proportion of nitrogen and hydrogen. lt proves the validity of law of
Q29. Which one of the following glasses is used in bullet proof screens?
Q30. Talc contains which of the following?
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