Seema Saini Solutions for Chapter: Some Basic Concepts, Mole Concept and Stoichiometry, Exercise 4: DPP 1.4

$\mathrm{NX}$ is produced by the following steps of reaction: 

$\mathrm{M}+{\mathrm{X}}_2⟶{\mathrm{MX}}_2$

$3{\mathrm{MX}}_2+{\mathrm{X}}_2⟶{\mathrm{M}}_3{\mathrm{X}}_8$

${\mathrm{M}}_3{\mathrm{X}}_8+{\mathrm{N}}_2{\mathrm{CO}}_3⟶\mathrm{NX}+{\mathrm{CO}}_2+{\mathrm{M}}_3{\mathrm{O}}_4$

How much $\mathrm{M}$ (metal) is consumed to produce $206 \mathrm{g}$ of $\mathrm{NX}$? $\left(\mathrm{Take} \mathrm{Atomic} \mathrm{weight} \mathrm{M}=56, \mathrm{N}=23, \mathrm{X}=80\right)$

The following process has been used to obtain iodine from oil-field brines in California.

$\mathrm{NaI}+{\mathrm{AgNO}}_3⟶\mathrm{AgI}+{\mathrm{NaNO}}_3$

$2\mathrm{AgI}+\mathrm{Fe}⟶{\mathrm{FeI}}_2+2\mathrm{Ag}$

$2{\mathrm{FeI}}_2+3{\mathrm{Cl}}_2⟶2{\mathrm{FeCl}}_3+2{\mathrm{I}}_2$

How many grams of ${\mathrm{AgNO}}_3$ are required in the first step for every $254 \mathrm{kg} {\mathrm{I}}_2$ produced in the third step? 

If $20.0 \mathrm{g}$ of ${\mathrm{CaCO}}_3$ is treated with $20.0 \mathrm{g}$ of $\mathrm{HCl}$, how many grams of ${\mathrm{CO}}_2$ can be produced according to the reaction: 

${\mathrm{CaCO}}_3\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)⟶{\mathrm{CaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)$

$2.4 \mathrm{g}$ of pure $\mathrm{Mg}$ (atomic mass $24$) is dropped in $100 \mathrm{mL}$ of $1 \mathrm{N} \mathrm{HCl}$. What is true?

$\mathrm{A}+\mathrm{B}\to {\mathrm{A}}_3{\mathrm{B}}_2$ (unbalanced) 

${\mathrm{A}}_3{\mathrm{B}}_2+\mathrm{C}\to {\mathrm{A}}_3{\mathrm{B}}_2{\mathrm{C}}_2$ (unbalanced) 

Above two reactions are carried out by taking $3$ moles each of $\mathrm{A}$ and $\mathrm{B}$ and one mole of $\mathrm{C}$. Then which option is/are correct?

If $27 \mathrm{g}$ of carbon is mixed with $88 \mathrm{g}$ of oxygen and is allowed to burn to produce ${\mathrm{CO}}_2$, then: 

A mixture containing $64.0 \mathrm{g} {\mathrm{H}}_2$ and $64.0 \mathrm{g} {\mathrm{O}}_2$ is ignited so that water is formed as follows: $2{\mathrm{H}}_2+{\mathrm{O}}_2⟶2{\mathrm{H}}_2\mathrm{O}$. Which of the following statements is/are correct?

Which of the following is/are correct? The following reaction occurs:

${\mathrm{Na}}_2{\mathrm{CO}}_3+2\mathrm{HCl}⟶2\mathrm{NaCl}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$

$106.0 \mathrm{g}$ of ${\mathrm{Na}}_2{\mathrm{CO}}_3$ reacts with $109.5 \mathrm{g}$ of $\mathrm{HCl}$.