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Which is the second most abundant elemen...

Which is the second most abundant element of group-18 in the universe ( next to hydrogen) ?

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Helium
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CHHAYA PUBLICATION-P-BLOCK ELEMENTS-PRACTICE SET 7 (ANSWER THE FOLLOWING QUESTIONS) : -
  1. Which is the second most abundant element of group-18 in the universe...

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  2. Why does R(3) P = O exist but R(3) N = O does not (R = alkyl grou...

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  3. H(2)S is acidic but H(2) O is neutral in nature - why ?

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  4. Fluorine cannot be prepared by oxidation of F^(-) ion - explain.

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  5. Interhalogen compounds are more reactive than halogen - why ?

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  6. Most of the noble gas compounds are by formed by xenon - why ?

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  7. Why is the group to which the noble gases belong termed as zero gr...

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  8. NH(3) is a better complexing agent than PH(3) - why ?

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  9. Why N(2) is chemically very inert at room termpreature ?

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  10. During manufacture of H(2)SO(4) by contact process, why is SO(3) n...

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  11. Which oxofluoride of xenon is octahedral ?

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  12. HF is weaker acid than HI. Explain.

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  13. Phosphours shows greater tendency for catenation than nitrogen .E...

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  14. Hydrolysis of XeF(6) is not a redox reaction - explain.

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  15. KHF(2) exists while KHCI(2), KHBr(2),KHI(2) do not - Why ?

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  16. Though nitrogen exhibits + 5 oxidation state is cannot form pen...

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  17. Bleaching by SO(2) is not premanent but that of Cl(2) is permane...

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  18. Write down the order of oxidising power of the oxoacids of chlor...

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