NEET Chemistry MCQ: NCERT Concentration Methods

🔄Ncert Concepts :Titration, Stoichiometry, Redox Reactions, Normality

2.

In the standardization of ${\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}$ using ${{\rm{K}}_2}{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_7}$ by iodometry, the equivalent weight of ${{\rm{K}}_2}{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_7}$ is :

A

$\begin{array}{*{20}{l}}

{\left( {molecular{\rm{ }}weight} \right)/2}

\end{array}$

B

$\begin{array}{*{20}{l}}

{\left( {molecular{\rm{ }}weight} \right)/6}

\end{array}$

C

$\begin{array}{*{20}{l}}

{\left( {molecular{\rm{ }}weight} \right)/3}

\end{array}$

D

Same as molecular weight

Question Tags

🔄Ncert Concepts :Redox Titration, Equivalent Weight, Oxidation Number

3.

In the standardization of ${\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}$ using ${{\rm{K}}_2}{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_7}$ by iodometry, the equivalent weight of ${{\rm{K}}_2}{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_7}$ is :

A

$\begin{array}{*{20}{l}}

{\left( {molecular{\rm{ }}weight} \right)/2}

\end{array}$

B

$\begin{array}{*{20}{l}}

{\left( {molecular{\rm{ }}weight} \right)/6}

\end{array}$

C

$\begin{array}{*{20}{l}}

{\left( {molecular{\rm{ }}weight} \right)/3}

\end{array}$

D

Same as molecular weight

Question Tags

🔄Ncert Concepts :Redox Titration, Equivalent Weight, Oxidation State, Iodometry

4.

$0.2$ g of a sample of ${{\rm{H}}_2}{{\rm{O}}_2}$ required $10$ mL of $N{\rm{KMn}}{{\rm{O}}_4}$ in a titration in the presence of ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}{\rm{.}}$ . Purity of ${{\rm{H}}_2}{{\rm{O}}_2}$ is :

A

$25\%$

B

$85\%$

C

$65\%$

D

$95\%$

Question Tags

🔄Ncert Concepts :Titration, Redox Reactions, Stoichiometry, Normality, Molar Mass, Percentage Purity

5.

What mass of ${\rm{Mn}}{{\rm{O}}_2}$ is reduced by 35 mL of 0.16 $N$ oxalic acid in acidic solution? The skeleton equation is, ${\rm{Mn}}{{\rm{O}}_2} + {{\rm{H}}^ + } + {{\rm{H}}_2}{{\rm{C}}_2}{{\rm{O}}_4} o {\rm{C}}{{\rm{O}}_2} + {{\rm{H}}_2}{\rm{O}} + {\rm{M}}{{\rm{n}}^{2 + }}:$

A

0.243 g

B

0.486 g

C

0.122 g

D

0.972 g

Question Tags