Which of the given orders is not correct?

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(D) $1$. Solubility of alkaline earth metal fluorides ($BeF_2$ to $BaF_2$) increases down the group due to the decrease in lattice energy being more s

Vedclass · Accepted Answer

All of these

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(D) $1$. Solubility of alkaline earth metal fluorides ($BeF_2$ to $BaF_2$) increases down the group due to the decrease in lattice energy being more significant than the decrease in hydration energy. Thus,$BeF_2 $2$. Acidic nature of metal hydrides increases as the electropositivity of the metal decreases. Since $Li$ is the least electropositive among $Li, Na, K$,$LiH$ is the most acidic. Thus,$LiH > NaH > KH$. The given order $LiH $3$. Thermal stability of alkali metal carbonates increases down the group as the electropositive character of the metal increases. Thus,$Li_2CO_3  Na_2CO_3 > K_2CO_3$ is incorrect.Since both $B$ and $C$ are incorrect,the question implies identifying the incorrect statements. However,if only one option is to be chosen,$D$ is the most appropriate answer as multiple options are incorrect.

Column-$I$	Column-$II$
$A$. $Li$	$1$. Insoluble sulphate
$B$. $Na$	$2$. Strongest monoacidic base
$C$. $Ca$	$3$. Most negative $E^{\circ}$ cell value among alkali metals
$D$. $Ba$	$4$. Insoluble oxalate
	$5$. $6s^2$ outer electronic configuration

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

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