NEET Chemistry Some Basic Concepts in Chemistry Concentration Methods MCQs

🔄Ncert Concepts :Equivalent mass, Stoichiometry

82.

How many gram of ${{\rm{I}}_2}$ are present in a solution which requires 40 mL, of 0.11 N ${\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}$ to react with it, ${{\rm{S}}_2}{\rm{O}}_3^{2 - } + {{\rm{I}}_2} o {{\rm{S}}_4}{\rm{O}}_6^{2 - } + 2{{\rm{I}}^ - }?$

A

12.7 g

B

0.558 g

C

25.4 g

D

11.4 g

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🔄Ncert Concepts :Normality, Equivalent weight, Stoichiometry, Molar mass

83.

For the reaction : ${{\rm{N}}_2} + 3{{\rm{H}}_2} o 2{\rm{N}}{{\rm{H}}_3}$ ; if ${E_1}\,and\,{E_2}$ are equivalent masses of $N{H_3}$ and ${N_2}$ respectively, then ${E_1}\, - \,{E_2}$ is :

A

1

B

2

C

3

D

4

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⚡ Time Required :2 mins

🔄Ncert Concepts :equivalent mass, stoichiometry

84.

How many gram of ${{\rm{I}}_2}$ are present in a solution which requires 40 mL, of 0.11 N ${\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}$ to react with it, ${{\rm{S}}_2}{\rm{O}}_3^{2 - } + {{\rm{I}}_2} o {{\rm{S}}_4}{\rm{O}}_6^{2 - } + 2{{\rm{I}}^ - }?$

A

0.56 g

B

0.28 g

C

1.12 g

D

0.84 g

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🔄Ncert Concepts :Normality, Stoichiometry, Molar mass, Equivalent weight

85.

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

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🔄Ncert Concepts :Redox Titration, Normality, Equivalent weight, Stoichiometry

86.

How many g of ${\rm{KMn}}{{\rm{O}}_4}$ are needed to prepare 3.75 litre of 0.850 $N$ solution if ${\rm{KMn}}{{\rm{O}}_4}$ is reduced as, ${\rm{MnO}}_4^ - + 8{{\rm{H}}^ + } + 5{\rm{e}} o {\rm{M}}{{\rm{n}}^{2 + }} + 4{{\rm{H}}_2}{\rm{O}}$

A

101 g

B

202g

C

50.5 g

D

303.0 g ${\rm{KMn}}{{\rm{O}}_4}$

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🔄Ncert Concepts :Normality, Equivalent weight, Molar mass, Stoichiometry

87.

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

8.7 g

B

0.24 g

C

0.84 g

D

43.5 g

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🔄Ncert Concepts :Redox Titration, Normality, Equivalent Weight, Stoichiometry

88.

How many g of ${\rm{KMn}}{{\rm{O}}_4}$ are needed to prepare 3.75 litre of 0.850 $N$ solution if ${\rm{KMn}}{{\rm{O}}_4}$ is reduced as, ${\rm{MnO}}_4^ - + 8{{\rm{H}}^ + } + 5{\rm{e}} o {\rm{M}}{{\rm{n}}^{2 + }} + 4{{\rm{H}}_2}{\rm{O}}$

A

101 g

B

202g

C

50.5 g

D

303.0 g ${\rm{KMn}}{{\rm{O}}_4}$

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🔄Ncert Concepts :Normality, Equivalent weight, Molar mass, Stoichiometry

89.

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

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