A certain weight of pure CaC$O_3$is made to react completely with 200 mL of an HCl solution to give 224 mL of C$O_2$gas at STP. The normality of the HCl is

The correct option is B: 0.1 N

$CaC{o}_3$+2HCl $⟶$$CaC{l}_2$+ $H_{2}O$+$C{O}_2$

The most common example is the molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.

We know that number of moles = Given mass /Molar mass

$n_{C{O}_2}$=$\frac{224}{22400}$ = ${10}^{-2}$

$n_{HCl}$ =2$n_{C{O}_2}$ = 2 $\times {10}^{-2}$

WKT

$N_1{V}_1=N_2{V}_2$

For a monobasic acid, molarity = Normality

So, $\frac{200\times N_{HCl}}{1000}$ = 2$\times {10}^{-2}$

$N_{HCl}$ =0.1N