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#1. Which is the most abundant noble gas:
#2. The oxidation of nitrogen in nitric acid is:
#3. FeSo4 forms brown ring with:
#4. Which one the following doesn’t exist
#6. ___ has the highest density:
#7. PCl5 exists but NCL5 does not due to:
#8. Which one has highest bond energy:
#9. The strongest oxidizing agent is:
#10. A mixture used for respiration by sea divers is:
#11. Catalytic oxidation of NH3 gives:
#12. Which one of the halogen is radioactive:
#13. Fluorine doesn’t show positive oxidation state due to absence of:
#14. Oxygen molecule shows
#15. Phosphorous has the oxidation state of +3 in:
#16. The boiling point of phosphine is____ than that of ammonia
#17. The element which doesn’t exhibit allotropy:
#18. Among the elements of group 15, the most electronegative element is:
#19. Maximum covalency of nitrogen is:
#20. Structure of ammonia is
