285456
Which of the following pairs has both the ions coloured in aqueous solution?
[Atomic number of \(\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=\) 29, \(\mathrm{Mn}=25]\)
1 \(\mathrm{Sc}^{3+}, \mathrm{Mn}^{2+}\)
2 \(\mathrm{Ni}^{2+}, \mathrm{Ti}^{4+}\)
3 \(\mathrm{Ti}^{3+}, \mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}, \mathrm{Ti}^{3+}\)
Explanation:
(d) For an ionic species of transition metals to be coloured, it should show\(d-d\) transition.
In order to show \(d-d\) transition it must contains unpaired electrons.
Karnataka CET 2021
CHEMISTRY(KCET)
285472
\(\mathrm{Mn}^{2+}\) compounds are more stable than \(\mathrm{Fe}^{2+}\) compounds towards oxidation to their +3 state, because
1 \(\mathrm{Mn}^{2+}\) is more stable with high \(3^{\text {rd }}\) ionisation energy
2 \(\mathrm{Mn}^{2+}\) is bigger in size
3 \(\mathrm{Mn}^{2+}\) has completely filled \(d\)-orbitals
4 \(\mathrm{Mn}^{2+}\) does not exist.
Explanation:
(a)\(\mathrm{Mn}^{2+}\) has stable half-filled electronic configuration thus, it has high third ionisation energy while \(\mathrm{Fe}^{2+}\) on losing one more electron will acquire this stable electronic configuration. Thus, \(\mathrm{Fe}^{2+}\) is more prone to get oxidised to +3 oxidation state.
(Y)
Karnataka CET 2016
CHEMISTRY(KCET)
285475
On heating potassium permanganate, one of the following compound is not obtained
285457
Aqueous solution of a salt\((A)\) forms a dense white precipitate with \(\mathrm{BaCl}_2\) solution. The precipitate dissolves in dilute \(\mathrm{HCl}^2\) to produce a gas ( \(B\) ) which decolourises acidified \(\mathrm{KMnO}_4\) solution. \(A\) and \(B\) respectively are
285456
Which of the following pairs has both the ions coloured in aqueous solution?
[Atomic number of \(\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=\) 29, \(\mathrm{Mn}=25]\)
1 \(\mathrm{Sc}^{3+}, \mathrm{Mn}^{2+}\)
2 \(\mathrm{Ni}^{2+}, \mathrm{Ti}^{4+}\)
3 \(\mathrm{Ti}^{3+}, \mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}, \mathrm{Ti}^{3+}\)
Explanation:
(d) For an ionic species of transition metals to be coloured, it should show\(d-d\) transition.
In order to show \(d-d\) transition it must contains unpaired electrons.
Karnataka CET 2021
CHEMISTRY(KCET)
285472
\(\mathrm{Mn}^{2+}\) compounds are more stable than \(\mathrm{Fe}^{2+}\) compounds towards oxidation to their +3 state, because
1 \(\mathrm{Mn}^{2+}\) is more stable with high \(3^{\text {rd }}\) ionisation energy
2 \(\mathrm{Mn}^{2+}\) is bigger in size
3 \(\mathrm{Mn}^{2+}\) has completely filled \(d\)-orbitals
4 \(\mathrm{Mn}^{2+}\) does not exist.
Explanation:
(a)\(\mathrm{Mn}^{2+}\) has stable half-filled electronic configuration thus, it has high third ionisation energy while \(\mathrm{Fe}^{2+}\) on losing one more electron will acquire this stable electronic configuration. Thus, \(\mathrm{Fe}^{2+}\) is more prone to get oxidised to +3 oxidation state.
(Y)
Karnataka CET 2016
CHEMISTRY(KCET)
285475
On heating potassium permanganate, one of the following compound is not obtained
285457
Aqueous solution of a salt\((A)\) forms a dense white precipitate with \(\mathrm{BaCl}_2\) solution. The precipitate dissolves in dilute \(\mathrm{HCl}^2\) to produce a gas ( \(B\) ) which decolourises acidified \(\mathrm{KMnO}_4\) solution. \(A\) and \(B\) respectively are
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
CHEMISTRY(KCET)
285456
Which of the following pairs has both the ions coloured in aqueous solution?
[Atomic number of \(\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=\) 29, \(\mathrm{Mn}=25]\)
1 \(\mathrm{Sc}^{3+}, \mathrm{Mn}^{2+}\)
2 \(\mathrm{Ni}^{2+}, \mathrm{Ti}^{4+}\)
3 \(\mathrm{Ti}^{3+}, \mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}, \mathrm{Ti}^{3+}\)
Explanation:
(d) For an ionic species of transition metals to be coloured, it should show\(d-d\) transition.
In order to show \(d-d\) transition it must contains unpaired electrons.
Karnataka CET 2021
CHEMISTRY(KCET)
285472
\(\mathrm{Mn}^{2+}\) compounds are more stable than \(\mathrm{Fe}^{2+}\) compounds towards oxidation to their +3 state, because
1 \(\mathrm{Mn}^{2+}\) is more stable with high \(3^{\text {rd }}\) ionisation energy
2 \(\mathrm{Mn}^{2+}\) is bigger in size
3 \(\mathrm{Mn}^{2+}\) has completely filled \(d\)-orbitals
4 \(\mathrm{Mn}^{2+}\) does not exist.
Explanation:
(a)\(\mathrm{Mn}^{2+}\) has stable half-filled electronic configuration thus, it has high third ionisation energy while \(\mathrm{Fe}^{2+}\) on losing one more electron will acquire this stable electronic configuration. Thus, \(\mathrm{Fe}^{2+}\) is more prone to get oxidised to +3 oxidation state.
(Y)
Karnataka CET 2016
CHEMISTRY(KCET)
285475
On heating potassium permanganate, one of the following compound is not obtained
285457
Aqueous solution of a salt\((A)\) forms a dense white precipitate with \(\mathrm{BaCl}_2\) solution. The precipitate dissolves in dilute \(\mathrm{HCl}^2\) to produce a gas ( \(B\) ) which decolourises acidified \(\mathrm{KMnO}_4\) solution. \(A\) and \(B\) respectively are
285456
Which of the following pairs has both the ions coloured in aqueous solution?
[Atomic number of \(\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=\) 29, \(\mathrm{Mn}=25]\)
1 \(\mathrm{Sc}^{3+}, \mathrm{Mn}^{2+}\)
2 \(\mathrm{Ni}^{2+}, \mathrm{Ti}^{4+}\)
3 \(\mathrm{Ti}^{3+}, \mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}, \mathrm{Ti}^{3+}\)
Explanation:
(d) For an ionic species of transition metals to be coloured, it should show\(d-d\) transition.
In order to show \(d-d\) transition it must contains unpaired electrons.
Karnataka CET 2021
CHEMISTRY(KCET)
285472
\(\mathrm{Mn}^{2+}\) compounds are more stable than \(\mathrm{Fe}^{2+}\) compounds towards oxidation to their +3 state, because
1 \(\mathrm{Mn}^{2+}\) is more stable with high \(3^{\text {rd }}\) ionisation energy
2 \(\mathrm{Mn}^{2+}\) is bigger in size
3 \(\mathrm{Mn}^{2+}\) has completely filled \(d\)-orbitals
4 \(\mathrm{Mn}^{2+}\) does not exist.
Explanation:
(a)\(\mathrm{Mn}^{2+}\) has stable half-filled electronic configuration thus, it has high third ionisation energy while \(\mathrm{Fe}^{2+}\) on losing one more electron will acquire this stable electronic configuration. Thus, \(\mathrm{Fe}^{2+}\) is more prone to get oxidised to +3 oxidation state.
(Y)
Karnataka CET 2016
CHEMISTRY(KCET)
285475
On heating potassium permanganate, one of the following compound is not obtained
285457
Aqueous solution of a salt\((A)\) forms a dense white precipitate with \(\mathrm{BaCl}_2\) solution. The precipitate dissolves in dilute \(\mathrm{HCl}^2\) to produce a gas ( \(B\) ) which decolourises acidified \(\mathrm{KMnO}_4\) solution. \(A\) and \(B\) respectively are
285456
Which of the following pairs has both the ions coloured in aqueous solution?
[Atomic number of \(\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=\) 29, \(\mathrm{Mn}=25]\)
1 \(\mathrm{Sc}^{3+}, \mathrm{Mn}^{2+}\)
2 \(\mathrm{Ni}^{2+}, \mathrm{Ti}^{4+}\)
3 \(\mathrm{Ti}^{3+}, \mathrm{Cu}^{+}\)
4 \(\mathrm{Mn}^{2+}, \mathrm{Ti}^{3+}\)
Explanation:
(d) For an ionic species of transition metals to be coloured, it should show\(d-d\) transition.
In order to show \(d-d\) transition it must contains unpaired electrons.
Karnataka CET 2021
CHEMISTRY(KCET)
285472
\(\mathrm{Mn}^{2+}\) compounds are more stable than \(\mathrm{Fe}^{2+}\) compounds towards oxidation to their +3 state, because
1 \(\mathrm{Mn}^{2+}\) is more stable with high \(3^{\text {rd }}\) ionisation energy
2 \(\mathrm{Mn}^{2+}\) is bigger in size
3 \(\mathrm{Mn}^{2+}\) has completely filled \(d\)-orbitals
4 \(\mathrm{Mn}^{2+}\) does not exist.
Explanation:
(a)\(\mathrm{Mn}^{2+}\) has stable half-filled electronic configuration thus, it has high third ionisation energy while \(\mathrm{Fe}^{2+}\) on losing one more electron will acquire this stable electronic configuration. Thus, \(\mathrm{Fe}^{2+}\) is more prone to get oxidised to +3 oxidation state.
(Y)
Karnataka CET 2016
CHEMISTRY(KCET)
285475
On heating potassium permanganate, one of the following compound is not obtained
285457
Aqueous solution of a salt\((A)\) forms a dense white precipitate with \(\mathrm{BaCl}_2\) solution. The precipitate dissolves in dilute \(\mathrm{HCl}^2\) to produce a gas ( \(B\) ) which decolourises acidified \(\mathrm{KMnO}_4\) solution. \(A\) and \(B\) respectively are