Question

Contrast the action of heat on the following and explain your answer:
(i) Na₂CO₃ and CaCO₃(ii) MgCl₂.6H₂O and CaCl₂.6H₂O
(iii) Ca(NO₃)₂ and NaNO₃.

Solution

(i) Na₂CO₃ and CaCO₂:
Na₂CO₃ does not decompose on heating while CaCO₃ decomposes on heating to produce calcium oxide and carbon dioxide.
$CaCO subscript 3 space rightwards arrow space space CaO space plus space CO subscript 2$
$left parenthesis ii right parenthesis space MgCl subscript 2 6 straight H subscript 2 straight O space and space CaCl subscript 2 6 straight H subscript 2 straight O$
$left parenthesis straight a right parenthesis space MgCl subscript 2 6 straight H subscript 2 straight O space rightwards arrow with Heat on top space MgO space plus space 2 HCl space plus space 5 straight H subscript 2 straight O left parenthesis straight b right parenthesis space CaCl subscript 2 6 straight H subscript 2 straight O space rightwards arrow with Heat on top space space CaCl subscript 2 space plus space 6 straight H subscript 2 straight O left parenthesis iii right parenthesis space Ca left parenthesis NO subscript 3 right parenthesis subscript 2 space and space NaNO subscript 3 colon left parenthesis straight a right parenthesis space 2 Ca left parenthesis NO subscript 3 right parenthesis subscript 2 space space rightwards arrow with Heat on top space 2 CaO space plus space 4 NO subscript 2 space plus space straight O subscript 2 left parenthesis straight b right parenthesis 2 NaNO subscript 3 space rightwards arrow with Heat on top space 2 NaNO subscript 2 space plus space straight O subscript 2$

Some More Questions From The s-Block Elements Chapter

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The S-Block Elements

Contrast the action of heat on the following and explain your answer:
(i) Na₂CO₃ and CaCO₃(ii) MgCl₂.6H₂O and CaCl₂.6H₂O
(iii) Ca(NO₃)₂ and NaNO₃.

Some More Questions From The s-Block Elements Chapter

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?

Why lithium cannot be stored in kerosene?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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The S-Block Elements

Contrast the action of heat on the following and explain your answer:(i) Na2CO3 and CaCO3(ii) MgCl2.6H2O and CaCl2.6H2O(iii) Ca(NO3)2 and NaNO3.

Some More Questions From The s-Block Elements Chapter

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?

Why lithium cannot be stored in kerosene?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Contrast the action of heat on the following and explain your answer:
(i) Na₂CO₃ and CaCO₃(ii) MgCl₂.6H₂O and CaCl₂.6H₂O
(iii) Ca(NO₃)₂ and NaNO₃.

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

Why alkali metals do not form M²⁺ions?