In a permanent magnet at room temperature,

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(D) permanent magnet is a substance that retains its ferromagnetic properties for a long period at room temperature.In ferromagnetic materials,individ

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Domains are all perfectly aligned

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(D) permanent magnet is a substance that retains its ferromagnetic properties for a long period at room temperature.In ferromagnetic materials,individual atoms possess a magnetic dipole moment.These atoms interact with each other such that they spontaneously align in a common direction over a macroscopic region known as a domain.In a permanent magnet,these domains are all perfectly aligned in the direction of the external magnetizing field,resulting in a strong net magnetic moment.

Column-$I$ (Molecules)	Column-$II$ (Number of lone pairs on central atom)
$A$. $NH_3$	$1$. Two
$B$. $H_2O$	$2$. Three
$C$. $XeF_2$	$3$. Zero
$D$. $CH_4$	$4$. Four
	$5$. One

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Match the following molecules in Column-$I$ with the number of lone pairs on their central atom in Column-$II$.
Column-$I$ (Molecules) Column-$II$ (Number of lone pairs on central atom)
$A$. $NH_3$ $1$. Two
$B$. $H_2O$ $2$. Three
$C$. $XeF_2$ $3$. Zero
$D$. $CH_4$ $4$. Four
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