08. THE D- & F-BLOCK ELEMENTS[KARNATAKA CET EXCLUSIVE]
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285463 A mixture of NaCl and\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is heated with conc. \(\mathrm{H}_2 \mathrm{SO}_4\), deep red vapours are formed. Which of the following statements is false?

1 The vapours give a yellow solution with NaOH .
2 The vapours contain\(\mathrm{CrO}_2 \mathrm{Cl}_2\) only.
3 The vapours contains\(\mathrm{CrO}_2 \mathrm{Cl}_2\) and \(\mathrm{Cl}_2\).
4 The vapours when passed into lead acetate in acetic acid gives a yellow precipitate.
Karnataka CET 2019
CHEMISTRY(KCET)

285464 Which of the following statements is wrong?

1 In highest oxidation states, the transition metals show acidic character.
2 \(\mathrm{Mn}^{3+}\) and \(\mathrm{Co}^{3+}\) are oxidising agents in aqueous solution.
3 Metals in highest oxidation states are more stable in oxides than in fluorides.
4 All elements of\(3 d\) series exhibit variable oxidation states.
Karnataka CET 2019
CHEMISTRY(KCET)

285465 Which of the following is an amphoteric oxide?

1 \(\mathrm{V}_2 \mathrm{O}_5, \mathrm{Cr}_2 \mathrm{O}_3\)
2 \(\mathrm{Mn}_2 \mathrm{O}_7, \mathrm{Cr}_2 \mathrm{O}_3\)
3 \(\mathrm{CrO}, \mathrm{V}_2 \mathrm{O}_5\)
4 \(\mathrm{V}_2 \mathrm{O}_5, \mathrm{~V}_2 \mathrm{O}_4\)
Karnataka CET 2018
CHEMISTRY(KCET)

285466 Which of the following oxidation states is common for all lanthanides?

1 +2
2 +3
3 +4
4 +5
Karnataka CET 2018
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CHEMISTRY(KCET)

285463 A mixture of NaCl and\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is heated with conc. \(\mathrm{H}_2 \mathrm{SO}_4\), deep red vapours are formed. Which of the following statements is false?

1 The vapours give a yellow solution with NaOH .
2 The vapours contain\(\mathrm{CrO}_2 \mathrm{Cl}_2\) only.
3 The vapours contains\(\mathrm{CrO}_2 \mathrm{Cl}_2\) and \(\mathrm{Cl}_2\).
4 The vapours when passed into lead acetate in acetic acid gives a yellow precipitate.
Karnataka CET 2019
CHEMISTRY(KCET)

285464 Which of the following statements is wrong?

1 In highest oxidation states, the transition metals show acidic character.
2 \(\mathrm{Mn}^{3+}\) and \(\mathrm{Co}^{3+}\) are oxidising agents in aqueous solution.
3 Metals in highest oxidation states are more stable in oxides than in fluorides.
4 All elements of\(3 d\) series exhibit variable oxidation states.
Karnataka CET 2019
CHEMISTRY(KCET)

285465 Which of the following is an amphoteric oxide?

1 \(\mathrm{V}_2 \mathrm{O}_5, \mathrm{Cr}_2 \mathrm{O}_3\)
2 \(\mathrm{Mn}_2 \mathrm{O}_7, \mathrm{Cr}_2 \mathrm{O}_3\)
3 \(\mathrm{CrO}, \mathrm{V}_2 \mathrm{O}_5\)
4 \(\mathrm{V}_2 \mathrm{O}_5, \mathrm{~V}_2 \mathrm{O}_4\)
Karnataka CET 2018
CHEMISTRY(KCET)

285466 Which of the following oxidation states is common for all lanthanides?

1 +2
2 +3
3 +4
4 +5
Karnataka CET 2018
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CHEMISTRY(KCET)

285463 A mixture of NaCl and\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is heated with conc. \(\mathrm{H}_2 \mathrm{SO}_4\), deep red vapours are formed. Which of the following statements is false?

1 The vapours give a yellow solution with NaOH .
2 The vapours contain\(\mathrm{CrO}_2 \mathrm{Cl}_2\) only.
3 The vapours contains\(\mathrm{CrO}_2 \mathrm{Cl}_2\) and \(\mathrm{Cl}_2\).
4 The vapours when passed into lead acetate in acetic acid gives a yellow precipitate.
Karnataka CET 2019
CHEMISTRY(KCET)

285464 Which of the following statements is wrong?

1 In highest oxidation states, the transition metals show acidic character.
2 \(\mathrm{Mn}^{3+}\) and \(\mathrm{Co}^{3+}\) are oxidising agents in aqueous solution.
3 Metals in highest oxidation states are more stable in oxides than in fluorides.
4 All elements of\(3 d\) series exhibit variable oxidation states.
Karnataka CET 2019
CHEMISTRY(KCET)

285465 Which of the following is an amphoteric oxide?

1 \(\mathrm{V}_2 \mathrm{O}_5, \mathrm{Cr}_2 \mathrm{O}_3\)
2 \(\mathrm{Mn}_2 \mathrm{O}_7, \mathrm{Cr}_2 \mathrm{O}_3\)
3 \(\mathrm{CrO}, \mathrm{V}_2 \mathrm{O}_5\)
4 \(\mathrm{V}_2 \mathrm{O}_5, \mathrm{~V}_2 \mathrm{O}_4\)
Karnataka CET 2018
CHEMISTRY(KCET)

285466 Which of the following oxidation states is common for all lanthanides?

1 +2
2 +3
3 +4
4 +5
Karnataka CET 2018
NEET DIGITAL LIBRARY
CHEMISTRY(KCET)

285463 A mixture of NaCl and\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is heated with conc. \(\mathrm{H}_2 \mathrm{SO}_4\), deep red vapours are formed. Which of the following statements is false?

1 The vapours give a yellow solution with NaOH .
2 The vapours contain\(\mathrm{CrO}_2 \mathrm{Cl}_2\) only.
3 The vapours contains\(\mathrm{CrO}_2 \mathrm{Cl}_2\) and \(\mathrm{Cl}_2\).
4 The vapours when passed into lead acetate in acetic acid gives a yellow precipitate.
Karnataka CET 2019
CHEMISTRY(KCET)

285464 Which of the following statements is wrong?

1 In highest oxidation states, the transition metals show acidic character.
2 \(\mathrm{Mn}^{3+}\) and \(\mathrm{Co}^{3+}\) are oxidising agents in aqueous solution.
3 Metals in highest oxidation states are more stable in oxides than in fluorides.
4 All elements of\(3 d\) series exhibit variable oxidation states.
Karnataka CET 2019
CHEMISTRY(KCET)

285465 Which of the following is an amphoteric oxide?

1 \(\mathrm{V}_2 \mathrm{O}_5, \mathrm{Cr}_2 \mathrm{O}_3\)
2 \(\mathrm{Mn}_2 \mathrm{O}_7, \mathrm{Cr}_2 \mathrm{O}_3\)
3 \(\mathrm{CrO}, \mathrm{V}_2 \mathrm{O}_5\)
4 \(\mathrm{V}_2 \mathrm{O}_5, \mathrm{~V}_2 \mathrm{O}_4\)
Karnataka CET 2018
CHEMISTRY(KCET)

285466 Which of the following oxidation states is common for all lanthanides?

1 +2
2 +3
3 +4
4 +5
Karnataka CET 2018
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