03. Laws of Chemical Combinations
Some Basic Concepts of Chemistry

228722 Which of the following species do not show disproportination on reaction?
$\mathrm{ClO}^{-}, \mathrm{ClO}_2^{-}, \mathrm{ClO}_3^{-}$

1 $\mathrm{ClO}_4^{-}$
2 $\mathrm{ClO}_3^{-}$
3 $\mathrm{ClO}^{-}$
4 None of these
Some Basic Concepts of Chemistry

228723 $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+x \mathrm{xCl}+6 \mathrm{H}_2 \mathrm{SO}_4 \times \mathrm{yCrO}_2 \mathrm{Cl}_2+$ $6 \mathrm{KHSO}_4+\mathrm{zH}_2 \mathrm{O}, \mathrm{x}, \mathrm{y}$ and $\mathrm{z}$ are respectively

1 $4,2,3$
2 $6,2,6$
3 $8,2,4$
4 $4,1,6$
Some Basic Concepts of Chemistry

228725 If Avogadro number $N_A$, is changed from 6.022 $\times 10^{23} \mathrm{~mol}^{-1}$ to $6.022 \times 10^{20} \mathrm{~mol}^{-1}$, this would change

1 the mass of one mole of carbon
2 the ratio of chemical species to each other in a balanced equation.
3 the ratio of elements to each other in a compound
4 the definition of mass in units of grams.
Some Basic Concepts of Chemistry

228726 $\mathrm{KMnO}_4$ reacts with oxalic acid according to the equation:
$\begin{aligned}
& 2 \mathrm{MnO}_4^{-}+5 \mathrm{C}_2 \mathrm{O}_4^{2-}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2 \\
& +\mathrm{8H}_2 \mathrm{O}
\end{aligned}$
Here $20 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{MnO}_4$ is equivalent to:

1 $20 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
2 $50 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
3 $50 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
4 $20 \mathrm{~mL}$ of $0.1 \mathrm{MH}_2 \mathrm{C}_2 \mathrm{O}_4$
Some Basic Concepts of Chemistry

228727 The volume of $0.1 \mathrm{M}$ oxalic acid that can be completely oxidized by $20 \mathrm{~mL}$ of $0.025 \mathrm{M}$ $\mathrm{KMnO}_4$ solution is

1 $25 \mathrm{~mL}$
2 $12.5 \mathrm{~mL}$
3 $37.5 \mathrm{~mL}$
4 $125 \mathrm{~mL}$
Some Basic Concepts of Chemistry

228722 Which of the following species do not show disproportination on reaction?
$\mathrm{ClO}^{-}, \mathrm{ClO}_2^{-}, \mathrm{ClO}_3^{-}$

1 $\mathrm{ClO}_4^{-}$
2 $\mathrm{ClO}_3^{-}$
3 $\mathrm{ClO}^{-}$
4 None of these
Some Basic Concepts of Chemistry

228723 $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+x \mathrm{xCl}+6 \mathrm{H}_2 \mathrm{SO}_4 \times \mathrm{yCrO}_2 \mathrm{Cl}_2+$ $6 \mathrm{KHSO}_4+\mathrm{zH}_2 \mathrm{O}, \mathrm{x}, \mathrm{y}$ and $\mathrm{z}$ are respectively

1 $4,2,3$
2 $6,2,6$
3 $8,2,4$
4 $4,1,6$
Some Basic Concepts of Chemistry

228725 If Avogadro number $N_A$, is changed from 6.022 $\times 10^{23} \mathrm{~mol}^{-1}$ to $6.022 \times 10^{20} \mathrm{~mol}^{-1}$, this would change

1 the mass of one mole of carbon
2 the ratio of chemical species to each other in a balanced equation.
3 the ratio of elements to each other in a compound
4 the definition of mass in units of grams.
Some Basic Concepts of Chemistry

228726 $\mathrm{KMnO}_4$ reacts with oxalic acid according to the equation:
$\begin{aligned}
& 2 \mathrm{MnO}_4^{-}+5 \mathrm{C}_2 \mathrm{O}_4^{2-}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2 \\
& +\mathrm{8H}_2 \mathrm{O}
\end{aligned}$
Here $20 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{MnO}_4$ is equivalent to:

1 $20 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
2 $50 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
3 $50 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
4 $20 \mathrm{~mL}$ of $0.1 \mathrm{MH}_2 \mathrm{C}_2 \mathrm{O}_4$
Some Basic Concepts of Chemistry

228727 The volume of $0.1 \mathrm{M}$ oxalic acid that can be completely oxidized by $20 \mathrm{~mL}$ of $0.025 \mathrm{M}$ $\mathrm{KMnO}_4$ solution is

1 $25 \mathrm{~mL}$
2 $12.5 \mathrm{~mL}$
3 $37.5 \mathrm{~mL}$
4 $125 \mathrm{~mL}$
Some Basic Concepts of Chemistry

228722 Which of the following species do not show disproportination on reaction?
$\mathrm{ClO}^{-}, \mathrm{ClO}_2^{-}, \mathrm{ClO}_3^{-}$

1 $\mathrm{ClO}_4^{-}$
2 $\mathrm{ClO}_3^{-}$
3 $\mathrm{ClO}^{-}$
4 None of these
Some Basic Concepts of Chemistry

228723 $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+x \mathrm{xCl}+6 \mathrm{H}_2 \mathrm{SO}_4 \times \mathrm{yCrO}_2 \mathrm{Cl}_2+$ $6 \mathrm{KHSO}_4+\mathrm{zH}_2 \mathrm{O}, \mathrm{x}, \mathrm{y}$ and $\mathrm{z}$ are respectively

1 $4,2,3$
2 $6,2,6$
3 $8,2,4$
4 $4,1,6$
Some Basic Concepts of Chemistry

228725 If Avogadro number $N_A$, is changed from 6.022 $\times 10^{23} \mathrm{~mol}^{-1}$ to $6.022 \times 10^{20} \mathrm{~mol}^{-1}$, this would change

1 the mass of one mole of carbon
2 the ratio of chemical species to each other in a balanced equation.
3 the ratio of elements to each other in a compound
4 the definition of mass in units of grams.
Some Basic Concepts of Chemistry

228726 $\mathrm{KMnO}_4$ reacts with oxalic acid according to the equation:
$\begin{aligned}
& 2 \mathrm{MnO}_4^{-}+5 \mathrm{C}_2 \mathrm{O}_4^{2-}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2 \\
& +\mathrm{8H}_2 \mathrm{O}
\end{aligned}$
Here $20 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{MnO}_4$ is equivalent to:

1 $20 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
2 $50 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
3 $50 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
4 $20 \mathrm{~mL}$ of $0.1 \mathrm{MH}_2 \mathrm{C}_2 \mathrm{O}_4$
Some Basic Concepts of Chemistry

228727 The volume of $0.1 \mathrm{M}$ oxalic acid that can be completely oxidized by $20 \mathrm{~mL}$ of $0.025 \mathrm{M}$ $\mathrm{KMnO}_4$ solution is

1 $25 \mathrm{~mL}$
2 $12.5 \mathrm{~mL}$
3 $37.5 \mathrm{~mL}$
4 $125 \mathrm{~mL}$
Some Basic Concepts of Chemistry

228722 Which of the following species do not show disproportination on reaction?
$\mathrm{ClO}^{-}, \mathrm{ClO}_2^{-}, \mathrm{ClO}_3^{-}$

1 $\mathrm{ClO}_4^{-}$
2 $\mathrm{ClO}_3^{-}$
3 $\mathrm{ClO}^{-}$
4 None of these
Some Basic Concepts of Chemistry

228723 $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+x \mathrm{xCl}+6 \mathrm{H}_2 \mathrm{SO}_4 \times \mathrm{yCrO}_2 \mathrm{Cl}_2+$ $6 \mathrm{KHSO}_4+\mathrm{zH}_2 \mathrm{O}, \mathrm{x}, \mathrm{y}$ and $\mathrm{z}$ are respectively

1 $4,2,3$
2 $6,2,6$
3 $8,2,4$
4 $4,1,6$
Some Basic Concepts of Chemistry

228725 If Avogadro number $N_A$, is changed from 6.022 $\times 10^{23} \mathrm{~mol}^{-1}$ to $6.022 \times 10^{20} \mathrm{~mol}^{-1}$, this would change

1 the mass of one mole of carbon
2 the ratio of chemical species to each other in a balanced equation.
3 the ratio of elements to each other in a compound
4 the definition of mass in units of grams.
Some Basic Concepts of Chemistry

228726 $\mathrm{KMnO}_4$ reacts with oxalic acid according to the equation:
$\begin{aligned}
& 2 \mathrm{MnO}_4^{-}+5 \mathrm{C}_2 \mathrm{O}_4^{2-}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2 \\
& +\mathrm{8H}_2 \mathrm{O}
\end{aligned}$
Here $20 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{MnO}_4$ is equivalent to:

1 $20 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
2 $50 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
3 $50 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
4 $20 \mathrm{~mL}$ of $0.1 \mathrm{MH}_2 \mathrm{C}_2 \mathrm{O}_4$
Some Basic Concepts of Chemistry

228727 The volume of $0.1 \mathrm{M}$ oxalic acid that can be completely oxidized by $20 \mathrm{~mL}$ of $0.025 \mathrm{M}$ $\mathrm{KMnO}_4$ solution is

1 $25 \mathrm{~mL}$
2 $12.5 \mathrm{~mL}$
3 $37.5 \mathrm{~mL}$
4 $125 \mathrm{~mL}$
Some Basic Concepts of Chemistry

228722 Which of the following species do not show disproportination on reaction?
$\mathrm{ClO}^{-}, \mathrm{ClO}_2^{-}, \mathrm{ClO}_3^{-}$

1 $\mathrm{ClO}_4^{-}$
2 $\mathrm{ClO}_3^{-}$
3 $\mathrm{ClO}^{-}$
4 None of these
Some Basic Concepts of Chemistry

228723 $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+x \mathrm{xCl}+6 \mathrm{H}_2 \mathrm{SO}_4 \times \mathrm{yCrO}_2 \mathrm{Cl}_2+$ $6 \mathrm{KHSO}_4+\mathrm{zH}_2 \mathrm{O}, \mathrm{x}, \mathrm{y}$ and $\mathrm{z}$ are respectively

1 $4,2,3$
2 $6,2,6$
3 $8,2,4$
4 $4,1,6$
Some Basic Concepts of Chemistry

228725 If Avogadro number $N_A$, is changed from 6.022 $\times 10^{23} \mathrm{~mol}^{-1}$ to $6.022 \times 10^{20} \mathrm{~mol}^{-1}$, this would change

1 the mass of one mole of carbon
2 the ratio of chemical species to each other in a balanced equation.
3 the ratio of elements to each other in a compound
4 the definition of mass in units of grams.
Some Basic Concepts of Chemistry

228726 $\mathrm{KMnO}_4$ reacts with oxalic acid according to the equation:
$\begin{aligned}
& 2 \mathrm{MnO}_4^{-}+5 \mathrm{C}_2 \mathrm{O}_4^{2-}+16 \mathrm{H}^{+} \rightarrow 2 \mathrm{Mn}^{2+}+10 \mathrm{CO}_2 \\
& +\mathrm{8H}_2 \mathrm{O}
\end{aligned}$
Here $20 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{MnO}_4$ is equivalent to:

1 $20 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
2 $50 \mathrm{~mL}$ of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
3 $50 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
4 $20 \mathrm{~mL}$ of $0.1 \mathrm{MH}_2 \mathrm{C}_2 \mathrm{O}_4$
Some Basic Concepts of Chemistry

228727 The volume of $0.1 \mathrm{M}$ oxalic acid that can be completely oxidized by $20 \mathrm{~mL}$ of $0.025 \mathrm{M}$ $\mathrm{KMnO}_4$ solution is

1 $25 \mathrm{~mL}$
2 $12.5 \mathrm{~mL}$
3 $37.5 \mathrm{~mL}$
4 $125 \mathrm{~mL}$