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No compounds of Kr and Xe are known....

No compounds of Kr and Xe are known.

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No compounds of He and Ne are known.
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ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-I)(Do not change the whole sentence)
  1. Nitrogen is an active non-metal.

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  2. Nitrogen forms pentahalides.

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  3. Boiling point of phosphine is higher than that of ammonia.

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  4. Phosphorus occus in free state.

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  5. Hydrogen sulfide is a monobasic acid in solution.

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  6. The number of valence electrons for each member of halogen family is e...

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  7. Members of the oxygen family are called halogens.

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  8. The ionization enthalpy of selenium is less than that of tellurium. Th...

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  9. Oxygen is the most electronegative element in the periodic table.

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  10. The oxidation state of fluorine can also be + 2. The given statement i...

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  11. Hydride of sulfur is more stable than that of oxygen. The given statem...

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  12. The bond energy of fluorine is more than that of chlorine.

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  13. At room temperature, all the elements of group 17 exist in the gaseous...

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  14. Among halogens, fluorine is least reactive.

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  15. Fluorine can be prepared by heating NaF and MnO2 with conc. sulfuric a...

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  16. Electron gain enthalpies of noble gases are negative.

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  17. No compounds of Kr and Xe are known.

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  18. Hydrogen fluoride is a better reducing agent than hydrogen bromide.

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  19. XeOF4 has .... geometry

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  20. The first noble gas compound was prepared by Ramsay.

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