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(D) The decomposition reactions at $500 \ ^oC$ are as follows:$(I)$ $K_2CO_3(s) \xrightarrow{\Delta} 	ext{No reaction}$. Thus,$x_1 = 0$.$(II)$ $2NaHC

Vedclass · Accepted Answer

$x_1 = x_2  x_4$

Vedclass · Answer

(D) The decomposition reactions at $500 \ ^oC$ are as follows:$(I)$ $K_2CO_3(s) \xrightarrow{\Delta} 	ext{No reaction}$. Thus,$x_1 = 0$.$(II)$ $2NaHCO_3(s) \xrightarrow{\Delta} Na_2CO_3(s) + H_2O(g) + CO_2(g)$. For $n$ moles of $NaHCO_3$,we get $n$ moles of gaseous products.$(III)$ $MgCO_3(s) \xrightarrow{\Delta} MgO(s) + CO_2(g)$. For $n$ moles of $MgCO_3$,we get $n$ moles of gaseous products.$(IV)$ $2CsHCO_3(s) \xrightarrow{\Delta} Cs_2CO_3(s) + H_2O(g) + CO_2(g)$. For $n$ moles of $CsHCO_3$,we get $n$ moles of gaseous products.Comparing the pressure generated: $x_1 = 0$. Since $NaHCO_3$ and $CsHCO_3$ decompose to produce $2$ moles of gas per $2$ moles of reactant,and $MgCO_3$ produces $1$ mole of gas per $1$ mole of reactant,the pressure depends on the extent of decomposition. $MgCO_3$ decomposes more easily than alkali metal bicarbonates at this temperature. Thus,$x_1  x_4$ is not present. Re-evaluating: $x_1=0$. $NaHCO_3$ and $CsHCO_3$ produce $1$ mole of gas per mole of reactant. $MgCO_3$ produces $1$ mole of gas per mole of reactant. However,$MgCO_3$ is thermally less stable than alkali carbonates/bicarbonates. Therefore,$x_1  x_4$.

List-$I$	List-$II$
$A$. Chlorophyll	$I$. $Na_2CO_3$
$B$. Soda ash	$II$. $CaSO_4$
$C$. Dentistry,Ornamental work	$III$. $Mg^{2+}$
$D$. Used in white washing	$IV$. $Ca(OH)_2$

Similar Questions

Match the following substances in List-$I$ with their uses in List-$II$:
| List-$I$ (Substance) | List-$II$ (Use) |
| :--- | :--- |
| $(A)$ $Na_2O_2$ | $(I)$ Photoelectric cells |
| $(B)$ $D_2O$ | $(II)$ Antacid |
| $(C)$ $Cs$ | $(III)$ Oxidising agent |
| $(D)$ $Mg(OH)_2$ | $(IV)$ Moderator |

Match List-$I$ with List-$II$.

List-$I$ List-$II$

$A$. Chlorophyll $I$. $Na_2CO_3$

$B$. Soda ash $II$. $CaSO_4$

$C$. Dentistry,Ornamental work $III$. $Mg^{2+}$

$D$. Used in white washing $IV$. $Ca(OH)_2$

Choose the correct answer from the options given below:

Which of the following compounds is/are used for oxygenating the submarine or spaceshuttle?

Which of the following pairs of atomic numbers represents elements belonging to the $s$-block?

Select the correct statement$(s)$.

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