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H-H, X-X and H-X bond energies are 104 ...

H-H, X-X and `H-X` bond energies are `104 Kcal//"mole" 60 Kcal//"mole"` and `101kcal//"mole"`. Assuming the electronegativity of hydrogen to be 2.1 the electronegativity of unknown element X is `(sqrt(19) = 4.36)`

A

`3.5`

B

3

C

4

D

`2.5`

Text Solution

Verified by Experts

The correct Answer is:
B
`X_(A)-X_(B)=0.208 sqrt(Delta), Delta = 101-(1)/(2)(104-60)`
`X_(A)-X_(B)=0.208sqrt(19)X_(A)-2.1 =0.906`
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NARAYNA-CLASSIFICATION OF ELEMENTS AND PERIODICITY -EXERCISE - 2 (H.W)
  1. The correct order of atomic radii is

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  2. In which of the following arrangements, the order is not correct accor...

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  3. Successive ionisation potentials of an element M are 8.3,25.1,37.9,259...

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  4. The IP(1),IP(2),IP(3) and IP(4) of an element A are 6.0, 10.0, 16.0 an...

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  5. H-H, X-X and H-X bond energies are 104 Kcal//"mole" 60 Kcal//"mole" a...

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  6. The ionisation energy and electron affinity of an element are 13.0ev a...

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  7. The bond energies of H-H, X-X and H-X are 104 K.cal, 38 K.cal and 138 ...

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  8. The atomic numbers of elements A,B,C and D are Z - 1, Z, Z + 1 and Z +...

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  9. M((g)) rarr M((g))^(+) +e^(-), DeltaH = 100eV M((g)) rarr M((g))^(2+...

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  10. The increasing order of the first ionization enthalpies of the element...

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  11. Using the data given below,predict the nature of heat changes for the ...

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  12. The IE1 " and " IE2 of Mg (g) are 740 and 1450 kJ "mol:^(-1) . Calcul...

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  13. How many Cs atoms can be convered to Cs^(+) ions by 1 joule energy if ...

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  14. The elecron affinity of chlorine is 3. 7 eV. How much energy in kcal i...

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  15. The energy needed for Li((g))to Li((g))^(+3)+3e^(-) is 1.96xx10^(4)"K...

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  16. Following statements regarding the periodic trends of chemical reactiv...

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  17. Which of the following represent the correct order of increasing first...

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  18. The correct sequence which shows decreasing order of the ionic radii o...

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  19. The set representing the correct order of ionic radius is

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  20. The charge/size ratio of a cation determines its polarising power. Whi...

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