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I1 of an element X is 899 kJ "mole"^(-1...

`I_1` of an element X is 899 kJ `"mole"^(-1)` and that of another element Y is 801kJ mole-1. Then X and Y may be

A

Li,Be

B

Be,B

C

B,C

D

C,N

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The correct Answer is:
B
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AAKASH SERIES-PERIODIC TABLE-OBJECTIVE EXERCISE -2B
  1. The atomic number of an element is 35. what is the total number of ele...

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  2. Regarding lanthanide contraction, some statements are given a) It a...

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  3. I1 of an element X is 899 kJ "mole"^(-1) and that of another element ...

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  4. Consider the following changes a) M((g))^(+2) rarr M((g))^(+3) + e^...

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  5. The correct order of IP2 , values among F, Na, Mg and Al is

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  6. The first (IP1) and the second (IP2) ionisation potential (kJ mol 1) o...

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  7. The ionisation energies of Lithium and Sodium are 520kJ Mol^(-1) and 4...

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

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  9. The first ionisation potentials of four consecutive elements present i...

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  10. H-H, X-X and H-X bond energies are 104 Kcal/mole 60Kcal/mole and 101Kc...

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

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  12. If the ionisation energy and electron affinity of an element are 275 a...

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  13. The elements which show both positive and negative oxidation states. i...

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  14. Match the following two lists given below in view of higest oxidation ...

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  15. Strongest reducing agent and strongest oxidising agent are respectivel...

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  16. Which of the following statement is correct

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  17. The radius of La^(3+) (Z=57) is 1.06A^(@). Which one of the following ...

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  18. (A): According to Mendeleeff atomic weight of 'Be' is 9.1 but experime...

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  19. Chloride of an element A gave a neutral solution in water. In the peri...

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  20. Which one of the following relations is correct with respect to first ...

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