Chemistry Quiz 7

Chemistry Quiz 7

1. The iron ore magnetite consists of





2. The molecule which has the highest percentage of ionic character among the following is





3. Zone refining is used for the purification of





4. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?





5. The most electropositive elements among the following is





6. The high reactivity of fluorine is due to





7. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is





8. The gas used for artificial ripening of green fruit is





9. The method that cannot be used for removing permanent hardness of water is





10. The hydronium ion is







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