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The S-Block Elements

Question
CBSEENCH11007142
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Comment on each of the following observations:
straight E to the power of circled dash space for space straight M to the power of 2 plus end exponent left parenthesis aq right parenthesis space plus 2 straight e to the power of minus space space rightwards arrow space space straight M left parenthesis straight s right parenthesis.
  (where M = Ca,  Sr or Ba) is nearly constant.

Solution
straight E to the power of circled dash space of space any space straight M to the power of 2 plus end exponent vertical line space straight M space electrode space depends space upon space three space factors colon(i) Ionisation enthalpy
(ii) Enthalpy of hydration
(iii) Enthalpy of vaporisation
The combined effect of these factors is approximately the same for Ca, Sr, and Ba. Hence, their electrode potentials are nearly constant.

Some More Questions From The s-Block Elements Chapter

Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?

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?

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