36. | Which of the following was to be discovered first in the chromospheres of the sun? | |||||||
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37. | Which of the following is in liquid form at room temperature? | |||||||
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39. | Which of the following are the ingredients of gun metal? | |||||||
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40. | From which mineral is radium obtained? | |||||||
Answer: Option D Explanation: No answer description available for this question |