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

321297 Assertion :
Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers.
Reason :
Change in colour is due to the complexation of alcohol with potassium dichromate.

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.
CHXII08:THE D- & F-BLOCK ELEMENTS

321298 Which of the following is not formed when \({{\rm{H}}_{\rm{2}}}{\rm{S}}\) reacts with acidic \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) solution?

1 \(\mathrm{\mathrm{K}_{2} \mathrm{SO}_{4}}\)
2 \(\mathrm{\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}}\)
3 \(\mathrm{\mathrm{S}}\)
4 \(\mathrm{\mathrm{CrSO}_{4}}\)
JEE - 2014
CHXII08:THE D- & F-BLOCK ELEMENTS

321299 \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is

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

321300 A mixture of \(\mathrm{\mathrm{NaCl}}\) and \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) is heated with conc. \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\), deep red vapours are formed. Which of the following statement is false?

1 The vapours give a yellow solution with \(\mathrm{\mathrm{NaOH}}\)
2 The vapours contain \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) only.
3 The vapours contains \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) and \(\mathrm{\mathrm{Cl}_{2}}\).
4 The vapours when passed into lead acetate in acetic acid gives a yellow precipitate.
KCET - 2019
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CHXII08:THE D- & F-BLOCK ELEMENTS

321297 Assertion :
Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers.
Reason :
Change in colour is due to the complexation of alcohol with potassium dichromate.

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.
CHXII08:THE D- & F-BLOCK ELEMENTS

321298 Which of the following is not formed when \({{\rm{H}}_{\rm{2}}}{\rm{S}}\) reacts with acidic \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) solution?

1 \(\mathrm{\mathrm{K}_{2} \mathrm{SO}_{4}}\)
2 \(\mathrm{\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}}\)
3 \(\mathrm{\mathrm{S}}\)
4 \(\mathrm{\mathrm{CrSO}_{4}}\)
JEE - 2014
CHXII08:THE D- & F-BLOCK ELEMENTS

321299 \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is

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

321300 A mixture of \(\mathrm{\mathrm{NaCl}}\) and \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) is heated with conc. \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\), deep red vapours are formed. Which of the following statement is false?

1 The vapours give a yellow solution with \(\mathrm{\mathrm{NaOH}}\)
2 The vapours contain \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) only.
3 The vapours contains \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) and \(\mathrm{\mathrm{Cl}_{2}}\).
4 The vapours when passed into lead acetate in acetic acid gives a yellow precipitate.
KCET - 2019
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CHXII08:THE D- & F-BLOCK ELEMENTS

321297 Assertion :
Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers.
Reason :
Change in colour is due to the complexation of alcohol with potassium dichromate.

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.
CHXII08:THE D- & F-BLOCK ELEMENTS

321298 Which of the following is not formed when \({{\rm{H}}_{\rm{2}}}{\rm{S}}\) reacts with acidic \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) solution?

1 \(\mathrm{\mathrm{K}_{2} \mathrm{SO}_{4}}\)
2 \(\mathrm{\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}}\)
3 \(\mathrm{\mathrm{S}}\)
4 \(\mathrm{\mathrm{CrSO}_{4}}\)
JEE - 2014
CHXII08:THE D- & F-BLOCK ELEMENTS

321299 \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is

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

321300 A mixture of \(\mathrm{\mathrm{NaCl}}\) and \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) is heated with conc. \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\), deep red vapours are formed. Which of the following statement is false?

1 The vapours give a yellow solution with \(\mathrm{\mathrm{NaOH}}\)
2 The vapours contain \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) only.
3 The vapours contains \(\mathrm{\mathrm{CrO}_{2} \mathrm{Cl}_{2}}\) and \(\mathrm{\mathrm{Cl}_{2}}\).
4 The vapours when passed into lead acetate in acetic acid gives a yellow precipitate.
KCET - 2019
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
CHXII08:THE D- & F-BLOCK ELEMENTS

321297 Assertion :
Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers.
Reason :
Change in colour is due to the complexation of alcohol with potassium dichromate.

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.
CHXII08:THE D- & F-BLOCK ELEMENTS

321298 Which of the following is not formed when \({{\rm{H}}_{\rm{2}}}{\rm{S}}\) reacts with acidic \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) solution?

1 \(\mathrm{\mathrm{K}_{2} \mathrm{SO}_{4}}\)
2 \(\mathrm{\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}}\)
3 \(\mathrm{\mathrm{S}}\)
4 \(\mathrm{\mathrm{CrSO}_{4}}\)
JEE - 2014
CHXII08:THE D- & F-BLOCK ELEMENTS

321299 \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is

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

321300 A mixture of \(\mathrm{\mathrm{NaCl}}\) and \(\mathrm{\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}\) is heated with conc. \(\mathrm{\mathrm{H}_{2} \mathrm{SO}_{4}}\), deep red vapours are formed. Which of the following statement is false?

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