Select the incorrect order.

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(C) $1$. Thermal stability of alkali metal nitrates increases down the group as the electropositive character increases,so $LiNO_3 < NaNO_3 < KNO_3$ i

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$Be(OH)_2 > Ca(OH)_2 > Sr(OH)_2 	o$ Thermal stability

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(C) $1$. Thermal stability of alkali metal nitrates increases down the group as the electropositive character increases,so $LiNO_3 $2$. Solubility of alkaline earth metal hydroxides increases down the group due to a decrease in lattice energy being more significant than the decrease in hydration energy,so $Be(OH)_2 $3$. Thermal stability of alkaline earth metal hydroxides increases down the group,so the order should be $Be(OH)_2  Ca(OH)_2 > Sr(OH)_2$ is incorrect.$4$. Solubility of alkali metal sulfates increases down the group,so $Li_2SO_4 < Na_2SO_4 < K_2SO_4$ is correct.

$1$. Burning candle	$i$. Line spectrum
$2$. Sodium vapour	$ii$. Continuous spectrum
$3$. Bunsen flame	$iii$. Band spectrum
$4$. Dark lines in solar spectrum	$iv$. Absorption spectrum

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