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61) The molecule which has the highest percentage of ionic character among the following is
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62) Which of the following is the poorest conductor of electricity?
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63) The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
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64) Main pollutant present in automobile exhaust is
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65) The liquid waste from kitchens and baths, of residences is known as :
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66) Most poisonous pollutant in water is
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67) Which of the following can be found as pollutants in the drinking water in some parts of India? Select the correct answer using the code given below. (A) Arsenic (B) Sorbitol (C) Fluoride (D) Formaldehyde (E) Uranium
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69) In fireworks, the green flame is produced because of
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70) The nucleus of a hydrogen atom consists of
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