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The S-Block Elements

Question
CBSEENCH11008363
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Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy? 

  • CaSO4

  • BeSO4

  • BaSO4

  • SrSO4

Solution

B.

BeSO4

Hydration energy varies inversely with the size and in sulphates of alkaline earth metals lattice energy remains almost constant.
The order of size of alkaline earth metal is
Be2+ > Ca2+ > Sr2+ > Ba2+
Hence, BaSO4 has the hydration enthalpy higher than the lattice enthalpy.

Some More Questions From The s-Block Elements Chapter

What is the nature of lithium compounds?

Group 1 elements are called alkali metals. Why?

Why caesium can be used in photoelectric cell while lithium can not be?

In aqueous solution, Li+ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason. 

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

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