321423
Which among the following cations will not form coloured compounds? (Atomic number \(\mathrm{Cu}=29, \mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Mn}=25\) )
1 \(\mathrm{V}^{3+}\)
2 \(\mathrm{Ti}^{3+}\)
3 \(\mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}\)
Explanation:
\(\mathrm{V}^{3+}: 3 \mathrm{~d}^{2} \rightarrow 2\) unpaired electrons \(\mathrm{Ti}^{3+}: 3 \mathrm{~d}^{1} \rightarrow 1\) unpaired electron \(\mathrm{Cu}^{+}: 3 \mathrm{~d}^{10} \rightarrow\) No unpaired electron \(\mathrm{Mn}^{2+}: 3 \mathrm{~d}^{5} \rightarrow 5\) unpaired electrons Due to absence of unpaired electron, \(\mathrm{Cu}^{+}\)will not form coloured compounds.
MHTCET - 2021
CHXII08:THE D- & F-BLOCK ELEMENTS
321424
Which of the following forms a colourless solution in aqueous medium (in water)?
1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{V^{3+}}\)
3 \(\mathrm{\mathrm{Sc}^{3+}}\)
4 \(\mathrm{T i^{3+}}\)
Explanation:
\({\rm{S}}{{\rm{c}}^{{\rm{3 + }}}}\) forms a colourless solution in aqueous medium as it does not posses any unpaired electron.
CHXII08:THE D- & F-BLOCK ELEMENTS
321425
The orange colour of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and purple colour of \({\mathrm{\mathrm{KMnO}_{4}}}\) is due to
1 \({\mathrm{\mathrm{d} \rightarrow \mathrm{d}}}\) transitions in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and charge transfer transitions in \({\mathrm{\mathrm{KMnO}_{4}}}\).
2 charge transfer transition in both.
3 \({\mathrm{d \rightarrow d}}\) transitions in both.
4 \({\mathrm{d \rightarrow d}}\) transitions in \({\mathrm{\mathrm{KMnO}_{4}}}\) and charge transfer transitions in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\).
Explanation:
In \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and \({\mathrm{\mathrm{KMnO}_{4}}}\), the colour is due to charge transfer phenomenon in which momentary transfer of \({\mathrm{\mathrm{e}^{-}}}\) from oxygen to metal atoms takes place. So, the correct option is (2).
JEE Main - 2024
CHXII08:THE D- & F-BLOCK ELEMENTS
321426
Which of the following compound is not coloured?
In \(\mathrm{Na}_{2} \mathrm{Cd} \cdot \mathrm{Cl}_{4}, \mathrm{Cd}^{2+}\) has no unpaired electron due to presence of\({{\rm{d}}^{{\rm{10}}}}\) electronic configuration. Hence,\(\mathrm{Na}_{2} \mathrm{Cd} . \mathrm{Cl}_{4}\) is a colourless compound.
321423
Which among the following cations will not form coloured compounds? (Atomic number \(\mathrm{Cu}=29, \mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Mn}=25\) )
1 \(\mathrm{V}^{3+}\)
2 \(\mathrm{Ti}^{3+}\)
3 \(\mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}\)
Explanation:
\(\mathrm{V}^{3+}: 3 \mathrm{~d}^{2} \rightarrow 2\) unpaired electrons \(\mathrm{Ti}^{3+}: 3 \mathrm{~d}^{1} \rightarrow 1\) unpaired electron \(\mathrm{Cu}^{+}: 3 \mathrm{~d}^{10} \rightarrow\) No unpaired electron \(\mathrm{Mn}^{2+}: 3 \mathrm{~d}^{5} \rightarrow 5\) unpaired electrons Due to absence of unpaired electron, \(\mathrm{Cu}^{+}\)will not form coloured compounds.
MHTCET - 2021
CHXII08:THE D- & F-BLOCK ELEMENTS
321424
Which of the following forms a colourless solution in aqueous medium (in water)?
1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{V^{3+}}\)
3 \(\mathrm{\mathrm{Sc}^{3+}}\)
4 \(\mathrm{T i^{3+}}\)
Explanation:
\({\rm{S}}{{\rm{c}}^{{\rm{3 + }}}}\) forms a colourless solution in aqueous medium as it does not posses any unpaired electron.
CHXII08:THE D- & F-BLOCK ELEMENTS
321425
The orange colour of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and purple colour of \({\mathrm{\mathrm{KMnO}_{4}}}\) is due to
1 \({\mathrm{\mathrm{d} \rightarrow \mathrm{d}}}\) transitions in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and charge transfer transitions in \({\mathrm{\mathrm{KMnO}_{4}}}\).
2 charge transfer transition in both.
3 \({\mathrm{d \rightarrow d}}\) transitions in both.
4 \({\mathrm{d \rightarrow d}}\) transitions in \({\mathrm{\mathrm{KMnO}_{4}}}\) and charge transfer transitions in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\).
Explanation:
In \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and \({\mathrm{\mathrm{KMnO}_{4}}}\), the colour is due to charge transfer phenomenon in which momentary transfer of \({\mathrm{\mathrm{e}^{-}}}\) from oxygen to metal atoms takes place. So, the correct option is (2).
JEE Main - 2024
CHXII08:THE D- & F-BLOCK ELEMENTS
321426
Which of the following compound is not coloured?
In \(\mathrm{Na}_{2} \mathrm{Cd} \cdot \mathrm{Cl}_{4}, \mathrm{Cd}^{2+}\) has no unpaired electron due to presence of\({{\rm{d}}^{{\rm{10}}}}\) electronic configuration. Hence,\(\mathrm{Na}_{2} \mathrm{Cd} . \mathrm{Cl}_{4}\) is a colourless compound.
321423
Which among the following cations will not form coloured compounds? (Atomic number \(\mathrm{Cu}=29, \mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Mn}=25\) )
1 \(\mathrm{V}^{3+}\)
2 \(\mathrm{Ti}^{3+}\)
3 \(\mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}\)
Explanation:
\(\mathrm{V}^{3+}: 3 \mathrm{~d}^{2} \rightarrow 2\) unpaired electrons \(\mathrm{Ti}^{3+}: 3 \mathrm{~d}^{1} \rightarrow 1\) unpaired electron \(\mathrm{Cu}^{+}: 3 \mathrm{~d}^{10} \rightarrow\) No unpaired electron \(\mathrm{Mn}^{2+}: 3 \mathrm{~d}^{5} \rightarrow 5\) unpaired electrons Due to absence of unpaired electron, \(\mathrm{Cu}^{+}\)will not form coloured compounds.
MHTCET - 2021
CHXII08:THE D- & F-BLOCK ELEMENTS
321424
Which of the following forms a colourless solution in aqueous medium (in water)?
1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{V^{3+}}\)
3 \(\mathrm{\mathrm{Sc}^{3+}}\)
4 \(\mathrm{T i^{3+}}\)
Explanation:
\({\rm{S}}{{\rm{c}}^{{\rm{3 + }}}}\) forms a colourless solution in aqueous medium as it does not posses any unpaired electron.
CHXII08:THE D- & F-BLOCK ELEMENTS
321425
The orange colour of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and purple colour of \({\mathrm{\mathrm{KMnO}_{4}}}\) is due to
1 \({\mathrm{\mathrm{d} \rightarrow \mathrm{d}}}\) transitions in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and charge transfer transitions in \({\mathrm{\mathrm{KMnO}_{4}}}\).
2 charge transfer transition in both.
3 \({\mathrm{d \rightarrow d}}\) transitions in both.
4 \({\mathrm{d \rightarrow d}}\) transitions in \({\mathrm{\mathrm{KMnO}_{4}}}\) and charge transfer transitions in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\).
Explanation:
In \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and \({\mathrm{\mathrm{KMnO}_{4}}}\), the colour is due to charge transfer phenomenon in which momentary transfer of \({\mathrm{\mathrm{e}^{-}}}\) from oxygen to metal atoms takes place. So, the correct option is (2).
JEE Main - 2024
CHXII08:THE D- & F-BLOCK ELEMENTS
321426
Which of the following compound is not coloured?
In \(\mathrm{Na}_{2} \mathrm{Cd} \cdot \mathrm{Cl}_{4}, \mathrm{Cd}^{2+}\) has no unpaired electron due to presence of\({{\rm{d}}^{{\rm{10}}}}\) electronic configuration. Hence,\(\mathrm{Na}_{2} \mathrm{Cd} . \mathrm{Cl}_{4}\) is a colourless compound.
321423
Which among the following cations will not form coloured compounds? (Atomic number \(\mathrm{Cu}=29, \mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Mn}=25\) )
1 \(\mathrm{V}^{3+}\)
2 \(\mathrm{Ti}^{3+}\)
3 \(\mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}\)
Explanation:
\(\mathrm{V}^{3+}: 3 \mathrm{~d}^{2} \rightarrow 2\) unpaired electrons \(\mathrm{Ti}^{3+}: 3 \mathrm{~d}^{1} \rightarrow 1\) unpaired electron \(\mathrm{Cu}^{+}: 3 \mathrm{~d}^{10} \rightarrow\) No unpaired electron \(\mathrm{Mn}^{2+}: 3 \mathrm{~d}^{5} \rightarrow 5\) unpaired electrons Due to absence of unpaired electron, \(\mathrm{Cu}^{+}\)will not form coloured compounds.
MHTCET - 2021
CHXII08:THE D- & F-BLOCK ELEMENTS
321424
Which of the following forms a colourless solution in aqueous medium (in water)?
1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{V^{3+}}\)
3 \(\mathrm{\mathrm{Sc}^{3+}}\)
4 \(\mathrm{T i^{3+}}\)
Explanation:
\({\rm{S}}{{\rm{c}}^{{\rm{3 + }}}}\) forms a colourless solution in aqueous medium as it does not posses any unpaired electron.
CHXII08:THE D- & F-BLOCK ELEMENTS
321425
The orange colour of \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and purple colour of \({\mathrm{\mathrm{KMnO}_{4}}}\) is due to
1 \({\mathrm{\mathrm{d} \rightarrow \mathrm{d}}}\) transitions in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and charge transfer transitions in \({\mathrm{\mathrm{KMnO}_{4}}}\).
2 charge transfer transition in both.
3 \({\mathrm{d \rightarrow d}}\) transitions in both.
4 \({\mathrm{d \rightarrow d}}\) transitions in \({\mathrm{\mathrm{KMnO}_{4}}}\) and charge transfer transitions in \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\).
Explanation:
In \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) and \({\mathrm{\mathrm{KMnO}_{4}}}\), the colour is due to charge transfer phenomenon in which momentary transfer of \({\mathrm{\mathrm{e}^{-}}}\) from oxygen to metal atoms takes place. So, the correct option is (2).
JEE Main - 2024
CHXII08:THE D- & F-BLOCK ELEMENTS
321426
Which of the following compound is not coloured?
In \(\mathrm{Na}_{2} \mathrm{Cd} \cdot \mathrm{Cl}_{4}, \mathrm{Cd}^{2+}\) has no unpaired electron due to presence of\({{\rm{d}}^{{\rm{10}}}}\) electronic configuration. Hence,\(\mathrm{Na}_{2} \mathrm{Cd} . \mathrm{Cl}_{4}\) is a colourless compound.
