Compounds of transition elements
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NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
CHXII08:THE D- & F-BLOCK ELEMENTS

321288 When hydrogen peroxide is added to acidified solution of dichromate \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}\), a deep blue coloured complex of chromic peroxide \(\mathrm{CrO}_{5}\) is formed. Oxidation state of \(\mathrm{Cr}\) in \(\mathrm{CrO}_{5}\) is

1 +5
2 +3
3 +6
4 -10
CHXII08:THE D- & F-BLOCK ELEMENTS

321289 Fusion of chromite ore with sodium carbonate in excess of air gives a compound (X) (yellow solution). X when treated with sulphuric acid gives

1 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{4}\)
2 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321290 Assertion :
\(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is not a primary standard in volumetric analysis.
Reason :
\(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is hygroscopic.

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

321291 Ammonium dichromate on heating decomposes with spark. This reaction is called

1 Phosphorescence
2 Incandescence
3 Chemical volcano
4 None of these
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CHXII08:THE D- & F-BLOCK ELEMENTS

321288 When hydrogen peroxide is added to acidified solution of dichromate \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}\), a deep blue coloured complex of chromic peroxide \(\mathrm{CrO}_{5}\) is formed. Oxidation state of \(\mathrm{Cr}\) in \(\mathrm{CrO}_{5}\) is

1 +5
2 +3
3 +6
4 -10
CHXII08:THE D- & F-BLOCK ELEMENTS

321289 Fusion of chromite ore with sodium carbonate in excess of air gives a compound (X) (yellow solution). X when treated with sulphuric acid gives

1 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{4}\)
2 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321290 Assertion :
\(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is not a primary standard in volumetric analysis.
Reason :
\(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is hygroscopic.

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

321291 Ammonium dichromate on heating decomposes with spark. This reaction is called

1 Phosphorescence
2 Incandescence
3 Chemical volcano
4 None of these
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CHXII08:THE D- & F-BLOCK ELEMENTS

321288 When hydrogen peroxide is added to acidified solution of dichromate \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}\), a deep blue coloured complex of chromic peroxide \(\mathrm{CrO}_{5}\) is formed. Oxidation state of \(\mathrm{Cr}\) in \(\mathrm{CrO}_{5}\) is

1 +5
2 +3
3 +6
4 -10
CHXII08:THE D- & F-BLOCK ELEMENTS

321289 Fusion of chromite ore with sodium carbonate in excess of air gives a compound (X) (yellow solution). X when treated with sulphuric acid gives

1 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{4}\)
2 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321290 Assertion :
\(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is not a primary standard in volumetric analysis.
Reason :
\(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is hygroscopic.

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

321291 Ammonium dichromate on heating decomposes with spark. This reaction is called

1 Phosphorescence
2 Incandescence
3 Chemical volcano
4 None of these
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
CHXII08:THE D- & F-BLOCK ELEMENTS

321288 When hydrogen peroxide is added to acidified solution of dichromate \(\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}\), a deep blue coloured complex of chromic peroxide \(\mathrm{CrO}_{5}\) is formed. Oxidation state of \(\mathrm{Cr}\) in \(\mathrm{CrO}_{5}\) is

1 +5
2 +3
3 +6
4 -10
CHXII08:THE D- & F-BLOCK ELEMENTS

321289 Fusion of chromite ore with sodium carbonate in excess of air gives a compound (X) (yellow solution). X when treated with sulphuric acid gives

1 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{4}\)
2 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321290 Assertion :
\(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is not a primary standard in volumetric analysis.
Reason :
\(\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is hygroscopic.

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

321291 Ammonium dichromate on heating decomposes with spark. This reaction is called

1 Phosphorescence
2 Incandescence
3 Chemical volcano
4 None of these
NEET DIGITAL LIBRARY