Which of the following does not liberate a br | vedclass

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(B) The thermal decomposition of $LiNO_3$ produces $Li_2O$,$NO_2$ (brown gas),and $O_2$.$4LiNO_3 \xrightarrow{\Delta} 2Li_2O + 4NO_2 + O_2$.$KNO_3$ de

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Action of heat on $KNO_3$

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(B) The thermal decomposition of $LiNO_3$ produces $Li_2O$,$NO_2$ (brown gas),and $O_2$.$4LiNO_3 \xrightarrow{\Delta} 2Li_2O + 4NO_2 + O_2$.$KNO_3$ decomposes to form $KNO_2$ and $O_2$ (colorless gas),so it does not liberate a brown gas.$2KNO_3 \xrightarrow{\Delta} 2KNO_2 + O_2$.Reaction of $Zn$ with conc $HNO_3$ produces $NO_2$ (brown gas).$Zn + 4HNO_3 \rightarrow Zn(NO_3)_2 + 2NO_2 + 2H_2O$.Addition of conc $H_2SO_4$ on $NaNO_3$ produces $HNO_3$ vapor,which decomposes to $NO_2$ (brown gas).$NaNO_3 + H_2SO_4 \rightarrow NaHSO_4 + HNO_3$ followed by $4HNO_3 \rightarrow 4NO_2 + 2H_2O + O_2$.

Compound	Uses
$1$. Soda ash	$a$. In purification of sugar
$2$. Calcium oxide	$b$. As an antacid
$3$. Baking soda	$c$. In paper and textile industries
	$d$. To prepare pure fats and oils

Which of the following does not liberate a brown gas?

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Match the following:

Compound Uses

$1$. Soda ash $a$. In purification of sugar

$2$. Calcium oxide $b$. As an antacid

$3$. Baking soda $c$. In paper and textile industries

$d$. To prepare pure fats and oils

Choose the correct order of density of the alkali metals.

Which of the following statements is incorrect?

The $s$-block elements are characterised by their larger atomic sizes,lower ionisation enthalpies,invariable $+1$ oxidation state and solubilities of their oxosalts. In the light of these features,describe the nature of their oxides,halides and oxosalts.

$NaHCO_3$ can be manufactured by Solvay's process but $K_2CO_3$ cannot be prepared because

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