321410
Assertion : Zinc copper couple that can be used as a reducing agent. Reason : Zinc copper couple can be obtained from zinc coated from copper.
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.
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321411
Which transition metal reduces steam to evolve hydrogen?
1 \(\mathrm{Mg}\)
2 \(\mathrm{Fe}\)
3 \(\mathrm{Sc}\)
4 \(\mathrm{Pt}\)
Explanation:
When steam is passed over red hot iron, it is decomposed to hydrogen. \(2 \mathrm{Fe}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2} \uparrow\)
CHXII08:THE D- & F-BLOCK ELEMENTS
321412
\(\mathrm{\mathrm{Cr}^{2+}}\) reducing and \(\mathrm{\mathrm{Mn}^{3+}}\) oxidising when both have \(\mathrm{\mathrm{d}^{4}}\) configuration because
1 \(\mathrm{\mathrm{Cr}^{+2}}\) attain \(\mathrm{\mathrm{d}^{3}}\) i.e., half filled \(\mathrm{\mathrm{t}_{2 \mathrm{~g}}}\) configuration by losing electron
2 \(\mathrm{\mathrm{Mn}^{3+}}\) to \(\mathrm{\mathrm{Mn}^{2+}}\) ion attain half filled \(\mathrm{\mathrm{d}^{5}}\) configuration by gaining electron.
3 By losing electron Cr becomes reducing while by gaining Mn become oxidising and both attain stability.
4 All the above
Explanation:
\(\mathrm{\mathrm{Cr}^{2+}}\) is reducing as its configuration changes from \(\mathrm{\mathrm{d}^{4}}\) to \(\mathrm{\mathrm{d}^{3}}\), the latter having a halffilled \(\mathrm{t_{2 g}}\) level. On the other hand, the change from \(\mathrm{\mathrm{Mn}^{3+}}\) to \(\mathrm{\mathrm{Mn}^{2+}}\) results in the half-filled \({\rm{(}}{{\rm{d}}^{\rm{5}}}{\rm{)}}\) configuration which has extra stability.
CHXII08:THE D- & F-BLOCK ELEMENTS
321413
Which of the following statements is not correct?
1 Copper liberates hydrogen from acids.
2 In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
3 \(\mathrm{\mathrm{Mn}^{3+}}\) and \(\mathrm{\mathrm{Co}^{3+}}\) are oxidising agents in aqueous solution.
4 \(\mathrm{\mathrm{Ti}^{2+}}\) and \(\mathrm{\mathrm{Cr}^{2+}}\) are reducing agents in aqueous solution.
Explanation:
Copper does not liberates hydrogen from acids as it is present below hydrogen in electrochemical series.
321410
Assertion : Zinc copper couple that can be used as a reducing agent. Reason : Zinc copper couple can be obtained from zinc coated from copper.
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.
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321411
Which transition metal reduces steam to evolve hydrogen?
1 \(\mathrm{Mg}\)
2 \(\mathrm{Fe}\)
3 \(\mathrm{Sc}\)
4 \(\mathrm{Pt}\)
Explanation:
When steam is passed over red hot iron, it is decomposed to hydrogen. \(2 \mathrm{Fe}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2} \uparrow\)
CHXII08:THE D- & F-BLOCK ELEMENTS
321412
\(\mathrm{\mathrm{Cr}^{2+}}\) reducing and \(\mathrm{\mathrm{Mn}^{3+}}\) oxidising when both have \(\mathrm{\mathrm{d}^{4}}\) configuration because
1 \(\mathrm{\mathrm{Cr}^{+2}}\) attain \(\mathrm{\mathrm{d}^{3}}\) i.e., half filled \(\mathrm{\mathrm{t}_{2 \mathrm{~g}}}\) configuration by losing electron
2 \(\mathrm{\mathrm{Mn}^{3+}}\) to \(\mathrm{\mathrm{Mn}^{2+}}\) ion attain half filled \(\mathrm{\mathrm{d}^{5}}\) configuration by gaining electron.
3 By losing electron Cr becomes reducing while by gaining Mn become oxidising and both attain stability.
4 All the above
Explanation:
\(\mathrm{\mathrm{Cr}^{2+}}\) is reducing as its configuration changes from \(\mathrm{\mathrm{d}^{4}}\) to \(\mathrm{\mathrm{d}^{3}}\), the latter having a halffilled \(\mathrm{t_{2 g}}\) level. On the other hand, the change from \(\mathrm{\mathrm{Mn}^{3+}}\) to \(\mathrm{\mathrm{Mn}^{2+}}\) results in the half-filled \({\rm{(}}{{\rm{d}}^{\rm{5}}}{\rm{)}}\) configuration which has extra stability.
CHXII08:THE D- & F-BLOCK ELEMENTS
321413
Which of the following statements is not correct?
1 Copper liberates hydrogen from acids.
2 In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
3 \(\mathrm{\mathrm{Mn}^{3+}}\) and \(\mathrm{\mathrm{Co}^{3+}}\) are oxidising agents in aqueous solution.
4 \(\mathrm{\mathrm{Ti}^{2+}}\) and \(\mathrm{\mathrm{Cr}^{2+}}\) are reducing agents in aqueous solution.
Explanation:
Copper does not liberates hydrogen from acids as it is present below hydrogen in electrochemical series.
NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXII08:THE D- & F-BLOCK ELEMENTS
321410
Assertion : Zinc copper couple that can be used as a reducing agent. Reason : Zinc copper couple can be obtained from zinc coated from copper.
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.
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321411
Which transition metal reduces steam to evolve hydrogen?
1 \(\mathrm{Mg}\)
2 \(\mathrm{Fe}\)
3 \(\mathrm{Sc}\)
4 \(\mathrm{Pt}\)
Explanation:
When steam is passed over red hot iron, it is decomposed to hydrogen. \(2 \mathrm{Fe}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2} \uparrow\)
CHXII08:THE D- & F-BLOCK ELEMENTS
321412
\(\mathrm{\mathrm{Cr}^{2+}}\) reducing and \(\mathrm{\mathrm{Mn}^{3+}}\) oxidising when both have \(\mathrm{\mathrm{d}^{4}}\) configuration because
1 \(\mathrm{\mathrm{Cr}^{+2}}\) attain \(\mathrm{\mathrm{d}^{3}}\) i.e., half filled \(\mathrm{\mathrm{t}_{2 \mathrm{~g}}}\) configuration by losing electron
2 \(\mathrm{\mathrm{Mn}^{3+}}\) to \(\mathrm{\mathrm{Mn}^{2+}}\) ion attain half filled \(\mathrm{\mathrm{d}^{5}}\) configuration by gaining electron.
3 By losing electron Cr becomes reducing while by gaining Mn become oxidising and both attain stability.
4 All the above
Explanation:
\(\mathrm{\mathrm{Cr}^{2+}}\) is reducing as its configuration changes from \(\mathrm{\mathrm{d}^{4}}\) to \(\mathrm{\mathrm{d}^{3}}\), the latter having a halffilled \(\mathrm{t_{2 g}}\) level. On the other hand, the change from \(\mathrm{\mathrm{Mn}^{3+}}\) to \(\mathrm{\mathrm{Mn}^{2+}}\) results in the half-filled \({\rm{(}}{{\rm{d}}^{\rm{5}}}{\rm{)}}\) configuration which has extra stability.
CHXII08:THE D- & F-BLOCK ELEMENTS
321413
Which of the following statements is not correct?
1 Copper liberates hydrogen from acids.
2 In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
3 \(\mathrm{\mathrm{Mn}^{3+}}\) and \(\mathrm{\mathrm{Co}^{3+}}\) are oxidising agents in aqueous solution.
4 \(\mathrm{\mathrm{Ti}^{2+}}\) and \(\mathrm{\mathrm{Cr}^{2+}}\) are reducing agents in aqueous solution.
Explanation:
Copper does not liberates hydrogen from acids as it is present below hydrogen in electrochemical series.
321410
Assertion : Zinc copper couple that can be used as a reducing agent. Reason : Zinc copper couple can be obtained from zinc coated from copper.
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.
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321411
Which transition metal reduces steam to evolve hydrogen?
1 \(\mathrm{Mg}\)
2 \(\mathrm{Fe}\)
3 \(\mathrm{Sc}\)
4 \(\mathrm{Pt}\)
Explanation:
When steam is passed over red hot iron, it is decomposed to hydrogen. \(2 \mathrm{Fe}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2} \uparrow\)
CHXII08:THE D- & F-BLOCK ELEMENTS
321412
\(\mathrm{\mathrm{Cr}^{2+}}\) reducing and \(\mathrm{\mathrm{Mn}^{3+}}\) oxidising when both have \(\mathrm{\mathrm{d}^{4}}\) configuration because
1 \(\mathrm{\mathrm{Cr}^{+2}}\) attain \(\mathrm{\mathrm{d}^{3}}\) i.e., half filled \(\mathrm{\mathrm{t}_{2 \mathrm{~g}}}\) configuration by losing electron
2 \(\mathrm{\mathrm{Mn}^{3+}}\) to \(\mathrm{\mathrm{Mn}^{2+}}\) ion attain half filled \(\mathrm{\mathrm{d}^{5}}\) configuration by gaining electron.
3 By losing electron Cr becomes reducing while by gaining Mn become oxidising and both attain stability.
4 All the above
Explanation:
\(\mathrm{\mathrm{Cr}^{2+}}\) is reducing as its configuration changes from \(\mathrm{\mathrm{d}^{4}}\) to \(\mathrm{\mathrm{d}^{3}}\), the latter having a halffilled \(\mathrm{t_{2 g}}\) level. On the other hand, the change from \(\mathrm{\mathrm{Mn}^{3+}}\) to \(\mathrm{\mathrm{Mn}^{2+}}\) results in the half-filled \({\rm{(}}{{\rm{d}}^{\rm{5}}}{\rm{)}}\) configuration which has extra stability.
CHXII08:THE D- & F-BLOCK ELEMENTS
321413
Which of the following statements is not correct?
1 Copper liberates hydrogen from acids.
2 In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
3 \(\mathrm{\mathrm{Mn}^{3+}}\) and \(\mathrm{\mathrm{Co}^{3+}}\) are oxidising agents in aqueous solution.
4 \(\mathrm{\mathrm{Ti}^{2+}}\) and \(\mathrm{\mathrm{Cr}^{2+}}\) are reducing agents in aqueous solution.
Explanation:
Copper does not liberates hydrogen from acids as it is present below hydrogen in electrochemical series.