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The s-Block Elements
Question
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The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is:

  • BeCO3 < MgCO3 < K2CO3 <CaCO3

  • BeCO3 < MgCO3 < CaCO3 <K2CO3

  • MgCO3 < BeCO3 < CaCO3 < K2CO3

  • K2CO3 < MgCO3 < CaCO3 < BeCO3

Answer

B.

BeCO3 < MgCO3 < CaCO3 <K2CO3

Thermal stability of carbonates increases in a group as we move from top to bottom and decreases in a period as we move from left to right. so, the correct order of thermal stability of given carbonates is:
BeCO3 < MgCO3 < CaCO3 < K2CO3
Be, Mg and Ca present in second group and K present in the first group.

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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?