The decomposition of a certain mass of $C a C O_{3}$ gave 11.2 $d m^{3}$ of $C O_{2}$ gas at S.T.P. The mass of KOH required to completely neutralise the gas is :

56 g

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28 g

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42 g

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20 g

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Solution

The correct option is B 28 g
Weight of 11.2 dm $^{3}$ of $C O_{2}$ gas at STP $= \frac{44}{2} = 22 g$
$K O H + C O_{2} ⟶ K H C O_{3}$
56 g 44 g
KOH required for complete neutralisation of $22 g C O_{2} = \frac{56}{44} \times 22 = 28 g$ .

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The decomposition of a certain mass of CaCO3 gave 11.2 dm3 of CO2 gas at S.T.P. The mass of KOH required to completely neutralise the gas is :

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The decomposition of a certain mass of $C a C O_{3}$ gave 11.2 $d m^{3}$ of $C O_{2}$ gas at S.T.P. The mass of KOH required to completely neutralise the gas is :

The correct option is B 28 g
Weight of 11.2 dm $^{3}$ of $C O_{2}$ gas at STP $= \frac{44}{2} = 22 g$
$K O H + C O_{2} ⟶ K H C O_{3}$
56 g 44 g
KOH required for complete neutralisation of $22 g C O_{2} = \frac{56}{44} \times 22 = 28 g$ .