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

321262 Which of the following is correct?

1 \(\mathrm{CrO}_{3}\) has peroxide bond in its structure.
2 Heating \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) produces \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) along with \(\mathrm{O}_{2}\).
3 Acidification of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) turns it yellow.
4 \(\mathrm{Cl}_{2}\) is liberated in little amount when \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{KCl}\) and conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) are heated together.
CHXII08:THE D- & F-BLOCK ELEMENTS

321263 The yellow colour of chromates changes to orange on acidification due to the formation of:

1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{CrO}_{4}^{-2}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321264 The oxidation number is changed in which of the following case

1 \(\mathrm{\mathrm{SO}_{2}}\) gas is passed into \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} / \mathrm{H}^{+}}\)
2 Aqueous solution of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{4}^{2-}}\) is acidified
3 \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) is dissolved in \(\mathrm{\mathrm{NaOH}}\)
4 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\) solution is made alkaline
CHXII08:THE D- & F-BLOCK ELEMENTS

321265 The number of \(\mathrm{\mathrm{Cr}-\mathrm{O}}\) bonds in dichromate ion is

1 6
2 7
3 8
4 4
NCERT Exemplar
CHXII08:THE D- & F-BLOCK ELEMENTS

321266 Assertion :
\(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is used as primary standard in volumetric analysis.
Reason :
It has a good solubility in water.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXII08:THE D- & F-BLOCK ELEMENTS

321262 Which of the following is correct?

1 \(\mathrm{CrO}_{3}\) has peroxide bond in its structure.
2 Heating \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) produces \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) along with \(\mathrm{O}_{2}\).
3 Acidification of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) turns it yellow.
4 \(\mathrm{Cl}_{2}\) is liberated in little amount when \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{KCl}\) and conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) are heated together.
CHXII08:THE D- & F-BLOCK ELEMENTS

321263 The yellow colour of chromates changes to orange on acidification due to the formation of:

1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{CrO}_{4}^{-2}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321264 The oxidation number is changed in which of the following case

1 \(\mathrm{\mathrm{SO}_{2}}\) gas is passed into \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} / \mathrm{H}^{+}}\)
2 Aqueous solution of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{4}^{2-}}\) is acidified
3 \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) is dissolved in \(\mathrm{\mathrm{NaOH}}\)
4 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\) solution is made alkaline
CHXII08:THE D- & F-BLOCK ELEMENTS

321265 The number of \(\mathrm{\mathrm{Cr}-\mathrm{O}}\) bonds in dichromate ion is

1 6
2 7
3 8
4 4
NCERT Exemplar
CHXII08:THE D- & F-BLOCK ELEMENTS

321266 Assertion :
\(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is used as primary standard in volumetric analysis.
Reason :
It has a good solubility in water.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXII08:THE D- & F-BLOCK ELEMENTS

321262 Which of the following is correct?

1 \(\mathrm{CrO}_{3}\) has peroxide bond in its structure.
2 Heating \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) produces \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) along with \(\mathrm{O}_{2}\).
3 Acidification of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) turns it yellow.
4 \(\mathrm{Cl}_{2}\) is liberated in little amount when \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{KCl}\) and conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) are heated together.
CHXII08:THE D- & F-BLOCK ELEMENTS

321263 The yellow colour of chromates changes to orange on acidification due to the formation of:

1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{CrO}_{4}^{-2}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321264 The oxidation number is changed in which of the following case

1 \(\mathrm{\mathrm{SO}_{2}}\) gas is passed into \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} / \mathrm{H}^{+}}\)
2 Aqueous solution of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{4}^{2-}}\) is acidified
3 \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) is dissolved in \(\mathrm{\mathrm{NaOH}}\)
4 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\) solution is made alkaline
CHXII08:THE D- & F-BLOCK ELEMENTS

321265 The number of \(\mathrm{\mathrm{Cr}-\mathrm{O}}\) bonds in dichromate ion is

1 6
2 7
3 8
4 4
NCERT Exemplar
CHXII08:THE D- & F-BLOCK ELEMENTS

321266 Assertion :
\(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is used as primary standard in volumetric analysis.
Reason :
It has a good solubility in water.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
NEET DIGITAL LIBRARY
CHXII08:THE D- & F-BLOCK ELEMENTS

321262 Which of the following is correct?

1 \(\mathrm{CrO}_{3}\) has peroxide bond in its structure.
2 Heating \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) produces \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) along with \(\mathrm{O}_{2}\).
3 Acidification of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) turns it yellow.
4 \(\mathrm{Cl}_{2}\) is liberated in little amount when \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{KCl}\) and conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) are heated together.
CHXII08:THE D- & F-BLOCK ELEMENTS

321263 The yellow colour of chromates changes to orange on acidification due to the formation of:

1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{CrO}_{4}^{-2}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321264 The oxidation number is changed in which of the following case

1 \(\mathrm{\mathrm{SO}_{2}}\) gas is passed into \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} / \mathrm{H}^{+}}\)
2 Aqueous solution of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{4}^{2-}}\) is acidified
3 \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) is dissolved in \(\mathrm{\mathrm{NaOH}}\)
4 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\) solution is made alkaline
CHXII08:THE D- & F-BLOCK ELEMENTS

321265 The number of \(\mathrm{\mathrm{Cr}-\mathrm{O}}\) bonds in dichromate ion is

1 6
2 7
3 8
4 4
NCERT Exemplar
CHXII08:THE D- & F-BLOCK ELEMENTS

321266 Assertion :
\(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is used as primary standard in volumetric analysis.
Reason :
It has a good solubility in water.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXII08:THE D- & F-BLOCK ELEMENTS

321262 Which of the following is correct?

1 \(\mathrm{CrO}_{3}\) has peroxide bond in its structure.
2 Heating \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) produces \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) along with \(\mathrm{O}_{2}\).
3 Acidification of \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) turns it yellow.
4 \(\mathrm{Cl}_{2}\) is liberated in little amount when \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{KCl}\) and conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) are heated together.
CHXII08:THE D- & F-BLOCK ELEMENTS

321263 The yellow colour of chromates changes to orange on acidification due to the formation of:

1 \(\mathrm{\mathrm{Cr}^{3+}}\)
2 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\)
3 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\)
4 \(\mathrm{\mathrm{CrO}_{4}^{-2}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321264 The oxidation number is changed in which of the following case

1 \(\mathrm{\mathrm{SO}_{2}}\) gas is passed into \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} / \mathrm{H}^{+}}\)
2 Aqueous solution of \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{4}^{2-}}\) is acidified
3 \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) is dissolved in \(\mathrm{\mathrm{NaOH}}\)
4 \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}}\) solution is made alkaline
CHXII08:THE D- & F-BLOCK ELEMENTS

321265 The number of \(\mathrm{\mathrm{Cr}-\mathrm{O}}\) bonds in dichromate ion is

1 6
2 7
3 8
4 4
NCERT Exemplar
CHXII08:THE D- & F-BLOCK ELEMENTS

321266 Assertion :
\(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is used as primary standard in volumetric analysis.
Reason :
It has a good solubility in water.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.