Compounds of transition elements
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CHXII08:THE D- & F-BLOCK ELEMENTS

321284 In the dichromate dianion,

1 \({\rm{4}}\,{\rm{Cr}} - {\rm{O}}\) bonds are equivalent
2 \({\rm{6}}\,{\rm{Cr}} - {\rm{O}}\) bonds are equivalent
3 all \(\mathrm{Cr}-\mathrm{O}\) bonds are equivalent
4 all \(\mathrm{Cr}-\mathrm{O}\) bonds are nonequivalent
CHXII08:THE D- & F-BLOCK ELEMENTS

321285 \(\mathrm{(\mathrm{X})+\mathrm{K}_{2} \mathrm{CO}_{3}+\mathrm{Air} \stackrel{\text { Heat }}{\longrightarrow}(Y)}\).
\(\mathrm{(Y)+\mathrm{Cl}_{2} \longrightarrow(Z)}\) Pink
Which of the following is correct?

1 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{MnO}_{2}, \mathrm{Y}=}\) Blue,
\(\rm{\mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Z}=\mathrm{KMnO}_{4} \text {. }}\)
2 \(\mathrm{\mathrm{X}=}\) Green, \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{Y}=}\) Yellow,
\(\mathrm{\mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Z}=\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\).
3 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{MnO}_{2}, \mathrm{Y}=}\) Green,
\(\mathrm{\mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{Z}=\mathrm{KMnO}_{4}}\).
4 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{Bi}_{2} \mathrm{O}_{3}, \mathrm{Y}=}\) Colourless,
\(\mathrm{\mathrm{KBiO}_{2}, \mathrm{Z}=\mathrm{KBiO}_{3}}\).
CHXII08:THE D- & F-BLOCK ELEMENTS

321286 In acidic medium, \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) shows oxidising action as represented in the half reaction
\({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+\mathrm{Ye}^{-} \rightarrow 2 \mathrm{~A}+\mathrm{ZH}_{2} \mathrm{O}}}\)
\({\mathrm{\mathrm{X}, \mathrm{Y}, \mathrm{Z}}}\) and A respectively are

1 \({\mathrm{8,4,6}}\) and \({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}}\)
2 \({\mathrm{14,7,6}}\) and \({\mathrm{\mathrm{Cr}^{3+}}}\)
3 \({\mathrm{14,6,7}}\) and \({\mathrm{\mathrm{Cr}^{3+}}}\)
4 \({\mathrm{8,6,4}}\) and \({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}}\)
JEE Main - 2024
CHXII08:THE D- & F-BLOCK ELEMENTS

321287 Which of the following statements is false?

1 An acidified solution of \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) liberates iodine from potassium iodide.
2 In acidic solution, dichromate ions are converted to chromate ions.
3 Ammonium dichromate on heating under goes endothermic decomposition to give \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\).
4 Potassium dichromate is used as a titrant for \(\mathrm{\mathrm{Fe}^{2+}}\) ions.
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CHXII08:THE D- & F-BLOCK ELEMENTS

321284 In the dichromate dianion,

1 \({\rm{4}}\,{\rm{Cr}} - {\rm{O}}\) bonds are equivalent
2 \({\rm{6}}\,{\rm{Cr}} - {\rm{O}}\) bonds are equivalent
3 all \(\mathrm{Cr}-\mathrm{O}\) bonds are equivalent
4 all \(\mathrm{Cr}-\mathrm{O}\) bonds are nonequivalent
CHXII08:THE D- & F-BLOCK ELEMENTS

321285 \(\mathrm{(\mathrm{X})+\mathrm{K}_{2} \mathrm{CO}_{3}+\mathrm{Air} \stackrel{\text { Heat }}{\longrightarrow}(Y)}\).
\(\mathrm{(Y)+\mathrm{Cl}_{2} \longrightarrow(Z)}\) Pink
Which of the following is correct?

1 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{MnO}_{2}, \mathrm{Y}=}\) Blue,
\(\rm{\mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Z}=\mathrm{KMnO}_{4} \text {. }}\)
2 \(\mathrm{\mathrm{X}=}\) Green, \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{Y}=}\) Yellow,
\(\mathrm{\mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Z}=\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\).
3 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{MnO}_{2}, \mathrm{Y}=}\) Green,
\(\mathrm{\mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{Z}=\mathrm{KMnO}_{4}}\).
4 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{Bi}_{2} \mathrm{O}_{3}, \mathrm{Y}=}\) Colourless,
\(\mathrm{\mathrm{KBiO}_{2}, \mathrm{Z}=\mathrm{KBiO}_{3}}\).
CHXII08:THE D- & F-BLOCK ELEMENTS

321286 In acidic medium, \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) shows oxidising action as represented in the half reaction
\({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+\mathrm{Ye}^{-} \rightarrow 2 \mathrm{~A}+\mathrm{ZH}_{2} \mathrm{O}}}\)
\({\mathrm{\mathrm{X}, \mathrm{Y}, \mathrm{Z}}}\) and A respectively are

1 \({\mathrm{8,4,6}}\) and \({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}}\)
2 \({\mathrm{14,7,6}}\) and \({\mathrm{\mathrm{Cr}^{3+}}}\)
3 \({\mathrm{14,6,7}}\) and \({\mathrm{\mathrm{Cr}^{3+}}}\)
4 \({\mathrm{8,6,4}}\) and \({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}}\)
JEE Main - 2024
CHXII08:THE D- & F-BLOCK ELEMENTS

321287 Which of the following statements is false?

1 An acidified solution of \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) liberates iodine from potassium iodide.
2 In acidic solution, dichromate ions are converted to chromate ions.
3 Ammonium dichromate on heating under goes endothermic decomposition to give \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\).
4 Potassium dichromate is used as a titrant for \(\mathrm{\mathrm{Fe}^{2+}}\) ions.
NEET DIGITAL LIBRARY
CHXII08:THE D- & F-BLOCK ELEMENTS

321284 In the dichromate dianion,

1 \({\rm{4}}\,{\rm{Cr}} - {\rm{O}}\) bonds are equivalent
2 \({\rm{6}}\,{\rm{Cr}} - {\rm{O}}\) bonds are equivalent
3 all \(\mathrm{Cr}-\mathrm{O}\) bonds are equivalent
4 all \(\mathrm{Cr}-\mathrm{O}\) bonds are nonequivalent
CHXII08:THE D- & F-BLOCK ELEMENTS

321285 \(\mathrm{(\mathrm{X})+\mathrm{K}_{2} \mathrm{CO}_{3}+\mathrm{Air} \stackrel{\text { Heat }}{\longrightarrow}(Y)}\).
\(\mathrm{(Y)+\mathrm{Cl}_{2} \longrightarrow(Z)}\) Pink
Which of the following is correct?

1 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{MnO}_{2}, \mathrm{Y}=}\) Blue,
\(\rm{\mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Z}=\mathrm{KMnO}_{4} \text {. }}\)
2 \(\mathrm{\mathrm{X}=}\) Green, \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{Y}=}\) Yellow,
\(\mathrm{\mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Z}=\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\).
3 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{MnO}_{2}, \mathrm{Y}=}\) Green,
\(\mathrm{\mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{Z}=\mathrm{KMnO}_{4}}\).
4 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{Bi}_{2} \mathrm{O}_{3}, \mathrm{Y}=}\) Colourless,
\(\mathrm{\mathrm{KBiO}_{2}, \mathrm{Z}=\mathrm{KBiO}_{3}}\).
CHXII08:THE D- & F-BLOCK ELEMENTS

321286 In acidic medium, \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) shows oxidising action as represented in the half reaction
\({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+\mathrm{Ye}^{-} \rightarrow 2 \mathrm{~A}+\mathrm{ZH}_{2} \mathrm{O}}}\)
\({\mathrm{\mathrm{X}, \mathrm{Y}, \mathrm{Z}}}\) and A respectively are

1 \({\mathrm{8,4,6}}\) and \({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}}\)
2 \({\mathrm{14,7,6}}\) and \({\mathrm{\mathrm{Cr}^{3+}}}\)
3 \({\mathrm{14,6,7}}\) and \({\mathrm{\mathrm{Cr}^{3+}}}\)
4 \({\mathrm{8,6,4}}\) and \({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}}\)
JEE Main - 2024
CHXII08:THE D- & F-BLOCK ELEMENTS

321287 Which of the following statements is false?

1 An acidified solution of \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) liberates iodine from potassium iodide.
2 In acidic solution, dichromate ions are converted to chromate ions.
3 Ammonium dichromate on heating under goes endothermic decomposition to give \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\).
4 Potassium dichromate is used as a titrant for \(\mathrm{\mathrm{Fe}^{2+}}\) ions.
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CHXII08:THE D- & F-BLOCK ELEMENTS

321284 In the dichromate dianion,

1 \({\rm{4}}\,{\rm{Cr}} - {\rm{O}}\) bonds are equivalent
2 \({\rm{6}}\,{\rm{Cr}} - {\rm{O}}\) bonds are equivalent
3 all \(\mathrm{Cr}-\mathrm{O}\) bonds are equivalent
4 all \(\mathrm{Cr}-\mathrm{O}\) bonds are nonequivalent
CHXII08:THE D- & F-BLOCK ELEMENTS

321285 \(\mathrm{(\mathrm{X})+\mathrm{K}_{2} \mathrm{CO}_{3}+\mathrm{Air} \stackrel{\text { Heat }}{\longrightarrow}(Y)}\).
\(\mathrm{(Y)+\mathrm{Cl}_{2} \longrightarrow(Z)}\) Pink
Which of the following is correct?

1 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{MnO}_{2}, \mathrm{Y}=}\) Blue,
\(\rm{\mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Z}=\mathrm{KMnO}_{4} \text {. }}\)
2 \(\mathrm{\mathrm{X}=}\) Green, \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{Y}=}\) Yellow,
\(\mathrm{\mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Z}=\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\).
3 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{MnO}_{2}, \mathrm{Y}=}\) Green,
\(\mathrm{\mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{Z}=\mathrm{KMnO}_{4}}\).
4 \(\mathrm{\mathrm{X}=}\) Black, \(\mathrm{\mathrm{Bi}_{2} \mathrm{O}_{3}, \mathrm{Y}=}\) Colourless,
\(\mathrm{\mathrm{KBiO}_{2}, \mathrm{Z}=\mathrm{KBiO}_{3}}\).
CHXII08:THE D- & F-BLOCK ELEMENTS

321286 In acidic medium, \({\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}}\) shows oxidising action as represented in the half reaction
\({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+\mathrm{Ye}^{-} \rightarrow 2 \mathrm{~A}+\mathrm{ZH}_{2} \mathrm{O}}}\)
\({\mathrm{\mathrm{X}, \mathrm{Y}, \mathrm{Z}}}\) and A respectively are

1 \({\mathrm{8,4,6}}\) and \({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}}\)
2 \({\mathrm{14,7,6}}\) and \({\mathrm{\mathrm{Cr}^{3+}}}\)
3 \({\mathrm{14,6,7}}\) and \({\mathrm{\mathrm{Cr}^{3+}}}\)
4 \({\mathrm{8,6,4}}\) and \({\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}}\)
JEE Main - 2024
CHXII08:THE D- & F-BLOCK ELEMENTS

321287 Which of the following statements is false?

1 An acidified solution of \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) liberates iodine from potassium iodide.
2 In acidic solution, dichromate ions are converted to chromate ions.
3 Ammonium dichromate on heating under goes endothermic decomposition to give \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\).
4 Potassium dichromate is used as a titrant for \(\mathrm{\mathrm{Fe}^{2+}}\) ions.
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