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The hydration energy of Mg^(2+) is larg...

The hydration energy of `Mg^(2+)` is larger than that of:

A

`Na^(+)`

B

`Be^(+2)`

C

`Al^(+3)`

D

All

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The correct Answer is:
A
Hydration energy `prop phi prop ("charge")/("size")`
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Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because (a) the hydration energy of Na_(2)SO_(4) is less than its lattice energy (b) the hydration energy of Na_(2)SO_(4) is more than its lattice energy (c) the lattice energy of BaSO_(4) is more than its hydration energy (d) the lattice energy has no role to play in solubility

The second ionisation energies are higher than the first ionisation energies. This is mainly due to the fact the after the removal of the first electron, the atom changes into monovalent positive ion. In the ion, the number of electrons decreases but the nuclear charge remains the same. as a result of this, the remaining electrons are held more tightly by the nucleus and it becomes difficult to remove the second electron. therefore, the value of second ionisation energy. (IE_(2)) , is greater than that of the first ionisatio energy (IE_(1)) . similarly third ionisation energy (IE_(3)) is greater than that of second IE_(2) . Q. IE_(1) and IE_(2) of Mg metal are 178 and 348 kcal/mol respectively. the energy required for the given reaction is: Mg(s) to Mg^(+2)+2e^(-)

The second ionisation energies are higher than the first ionisation energies. This is mainly due to the fact the after the removal of the first electron, the atom changes into monovalent positive ion. In the ion, the number of electrons decreases but the nuclear charge remains the same. as a result of this, the remaining electrons are held more tightly by the nucleus and it becomes difficult to remove the second electron. therefore, the value of second ionisation energy. (IE_(2)) , is greater than that of the first ionisatio energy (IE_(1)) . similarly third ionisation energy (IE_(3)) is greater than that of second IE_(2) . Q. IE_(1) and IE_(2) of Mg metal are 178 and 348 kcal/mol respectively. the energy required for the given reaction is: Mg(s) to Mg^(+2)+2e^(-)

A : The value of van der Waal's constant 'a' of Cl_(2) is larger than that of F_(2) R : Larger the surface area, higher will. Be intermolecualr forces of attraction .

ALLEN-S-BLOCK ELEMENTS -EXERCISE
  1. When heated in steam, Mg burns brilliantly producing-

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  2. A piece of magnesium ribbon is heated to redness in an atmosphere of n...

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  3. The hydration energy of Mg^(2+) is larger than that of:

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  4. Molten sodium chloride conducts electricity due to the presence of:

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  5. Which of the following element have maximum tendency to form complex c...

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  6. The compound formed on heating sodium metal in a current of dry ammoni...

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  7. A body weighs 64 N on the surface of the Earth. What is the gravitatio...

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  8. The reactivity of IA elements is due to-

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  9. The metal not found in the native state is-

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  10. The property of Be resembles with-

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  11. In barium hydride, hydrogen is-

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  12. Haploids are more stuitable for mutation studies than the diploids. T...

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  13. Which of the following alkali metals has the biggest tendency of the h...

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  14. Which of the following forms the most basic hydroxide-

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  15. Complex forming tendency is more for-

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  16. Strongest reducing agent is

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  17. Both Be and Al become passive on reaction with conc. nitric acid due t...

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  18. Which of the following is an amphoteric oxide-

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  19. Which one of the following is most soluble in ether

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  20. Li has the maximum value of ionisation potential among alkali metals i...

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