(D) The chemical reactions are:$2NaHCO_3 + H_2C_2O_4 \to Na_2C_2O_4 + 2H_2O + 2CO_2$Let the mass of $NaHCO_3$ be $x \ g$. Then the mass of $H_2C_2O_4$

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(D) The chemical reactions are:$2NaHCO_3 + H_2C_2O_4 \to Na_2C_2O_4 + 2H_2O + 2CO_2$Let the mass of $NaHCO_3$ be $x \ g$. Then the mass of $H_2C_2O_4$ is $(10 - x) \ g$.Moles of $NaHCO_3 = \frac{x}{84}$.Moles of $H_2C_2O_4 = \frac{10 - x}{90}$.Since $2 \ mol$ of $NaHCO_3$ reacts with $1 \ mol$ of $H_2C_2O_4$,the limiting reagent determines the $CO_2$ produced.Assuming $NaHCO_3$ is the limiting reagent,$n_{CO_2} = n_{NaHCO_3} = \frac{x}{84}$.Given $n_{CO_2} = \frac{0.25 \ L}{25.0 \ L \ mol^{-1}} = 0.01 \ mol$.$\frac{x}{84} = 0.01 \implies x = 0.84 \ g$.Percentage of $NaHCO_3 = \frac{0.84 \ g}{10 \ g} \times 100 = 8.4\%$.

Class 11 Chemistry Some Basic Concepts of Chemistry Chemical stoichiometry

Difficult

$A$ $10 \ g$ effervescent tablet containing sodium bicarbonate $(NaHCO_3)$ and oxalic acid $(H_2C_2O_4)$ releases $0.25 \ L$ of $CO_2$ at $T = 298.15 \ K$ and $p = 1 \ bar$. If the molar volume of $CO_2$ is $25.0 \ L \ mol^{-1}$ under these conditions,what is the percentage by mass of sodium bicarbonate in each tablet? [Molar mass of $NaHCO_3 = 84 \ g \ mol^{-1}$,Molar mass of $H_2C_2O_4 = 90 \ g \ mol^{-1}$]

JEE MAIN 2019 All JEE MAIN

A
$0.84$
B
$33.6$
C
$16.8$
D
$8.4$

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Class 11

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Some Basic Concepts of Chemistry

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Chemical stoichiometry

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$100 \, mL$ of $0.1 \, N \, HCl$ is neutralized by $0.2 \, N \, NaOH$ solution. After adding $30 \, mL$ of $NaOH$ solution,the neutralization is continued using $0.25 \, N \, KOH$. Calculate the volume of $KOH$ in $mL$ required to complete the neutralization.

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$A$ $250 \, mL$ solution of sodium carbonate contains $5.3 \, g$ of $Na_2CO_3$. If $10 \, mL$ of this solution is taken and diluted with distilled water to $0.1 \, L$,what will be the concentration of the resulting solution?

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$A$ $6 \ L$ sample of hard water has a total hardness of $200 \ ppm$ of $Mg^{2+}$ in the form of bicarbonates and chlorides. This sample is treated with $Na_2CO_3$ to eliminate all temporary hardness,and the new hardness is found to be $\frac{1000}{3} \ ppm$ of $CaCO_3$. Find the mass of $MgCl_2$ in the $6 \ L$ sample in $mg$. $(d_{H_2O} = 1 \ g/mL)$

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$A$ gaseous mixture contains $CH_4$ and $C_2H_6$ in equimolecular proportion. The weight of $2.24 \ L$ of this mixture at $S.T.P.$ is :- .............. $g$

Medium

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The amount of calcium oxide produced on heating $150 \ kg$ of limestone ($75 \%$ pure) is $........... \ kg$ $(Nearest \ integer)$. Given: Molar mass (in $g \ mol^{-1}$) of $Ca = 40, O = 16, C = 12$.

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$100 \, mL$ of $0.1 \, N \, HCl$ is neutralized by $0.2 \, N \, NaOH$ solution. After adding $30 \, mL$ of $NaOH$ solution,the neutralization is continued using $0.25 \, N \, KOH$. Calculate the volume of $KOH$ in $mL$ required to complete the neutralization.

$A$ $250 \, mL$ solution of sodium carbonate contains $5.3 \, g$ of $Na_2CO_3$. If $10 \, mL$ of this solution is taken and diluted with distilled water to $0.1 \, L$,what will be the concentration of the resulting solution?

$A$ gaseous mixture contains $CH_4$ and $C_2H_6$ in equimolecular proportion. The weight of $2.24 \ L$ of this mixture at $S.T.P.$ is :- .............. $g$

The amount of calcium oxide produced on heating $150 \ kg$ of limestone ($75 \%$ pure) is $........... \ kg$ $(Nearest \ integer)$. Given: Molar mass (in $g \ mol^{-1}$) of $Ca = 40, O = 16, C = 12$.

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