Download App

Chemistry Assertion And Reason.

Transition and Inner Transition Elements · Tamil Nadu Board STD 12 (Tamil - English Medium). 8 questions.

Questions

Assertion And Reason.

🎯

Test yourself on this topic

8 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A) – Transition metals form large number of complexes.
Reason (R) – Transition metals are small and highly charged and they have vacant low energy orbitals to accept an electron pair donated by other groups.
  • ✓
    Both (A) and (R) are correct and (R) is the correct explanation of (A)
  • B
    Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  • C
    (A) is correct but (R) is wrong
  • D
    (A) is wrong but (R) is wrong
Answer
Correct option: A.
Both (A) and (R) are correct and (R) is the correct explanation of (A)
Both (A) and (R) are correct and (R) is the correct explanation
View full question & answer→
MCQ 21 Mark
Assertion (A) – Copper is unique in 3d series having a stable +1 oxidation state.
Reason (R) – Copper is prone to disproportionate to the +2 and 0 oxidation states.
  • A
    Both (A) and (R) are correct but (R) is not the correct explanation of (A).
  • ✓
    Both (A) and (R) are correct and (R) explains (A).
  • C
    (A) is correct but (R) is wrong.
  • D
    (A) is wrong but (R) is correct.
Answer
Correct option: B.
Both (A) and (R) are correct and (R) explains (A).
Both (A) and (R) are correct and (R) explains (A).
View full question & answer→
MCQ 31 Mark
Assertion (A) $- Mn ^{2+}$ is more stable than $Mn ^{4+}$
Reason $(R)- Mn ^{2+}\left(3 d^5\right)$ is more stable than $Mn ^{4+}\left(3 d^3\right)$ is due to extra stability of half-filled electronic configuration.
  • ✓
    Both (A) and (R) are correct and (R) is the correct explanation of (A)
  • B
    Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  • C
    (A) is correct but (R) is wrong
  • D
    (A) is wrong but (R) is correct
Answer
Correct option: A.
Both (A) and (R) are correct and (R) is the correct explanation of (A)
Both (A) and (R) are correct and (R) is the correct explanation of (A)
View full question & answer→
MCQ 41 Mark
Assertion (A) – Except Scandium all 3d series, transition elements exhibit variable oxidation states.
Reason (R) – By loosing electrons from (n – l)d orbital and ns orbital as the energy difference between them is very small.
  • ✓
    Both (A) and (R) are correct and (R) explains (A).
  • B
    Both (A) and (R) are correct but (R) is not the correct explanation of (A).
  • C
    (A) is correct but (R) is wrong.
  • D
    (A) is wrong but (R) is correct.
Answer
Correct option: A.
Both (A) and (R) are correct and (R) explains (A).
Both (A) and (R) are correct and (R) explains (A).
View full question & answer→
MCQ 51 Mark
Assertion (A) – Ni (II) compounds are thermodynamically more stable than Pt (II) compounds.
Reason (R) – The energy required to form $Ni^{2-}$ is less than that of $Pt ^{2+}$
  • ✓
    Both (A) and (R) are correct and (R) explains (A).
  • B
    Both (A) and (R) are correct but (R) is not the correct explanation of (A).
  • C
    (A) is correct but (R) is wrong.
  • D
    (A) is wrong but (R) is correct.
Answer
Correct option: A.
Both (A) and (R) are correct and (R) explains (A).
Both (A) and (R) are correct and (R) explains (A).
View full question & answer→
MCQ 61 Mark
Assertion (A) – In transition metal series, the ionization enthalpy increases.
Reason (R) – This is due to increase in nuclear charge corresponding to the filling of d electrons.
  • ✓
    Both (A) and (R) are correct and (R) explains (A).
  • B
    Both (A) and (R) are correct but (R) is not the correct explanation of (A).
  • C
    (A) is correct but (R) is wrong.
  • D
    (A) is wrong but (R) is correct.
Answer
Correct option: A.
Both (A) and (R) are correct and (R) explains (A).
Both (A) and (R) are correct and (R) explains (A).
View full question & answer→
MCQ 71 Mark
Assertion (A) – In 3d transition elements, the expected decrease in atomic radius is observed from Sc to V, thereafter upto Cu, the atomic radius nearly remains the same.
Reason (R) – As we move from Sc to V, the added 3d electrons only partially shield the increased nuclear charge but upto Cu, the extra electron added to 3d sub-shell repel the 4s electrons and the slight increase in nuclear charge operated in opposite direction and it leads to constancy in atomic radii.
  • ✓
    Both (A) and (R) are correct and (R) explains (A).
  • B
    Both (A) and (R) are correct but (R) is not the correct explanation of (A).
  • C
    (A) is correct but (R) is wrong.
  • D
    (A) is wrong but (R) is correct.
Answer
Correct option: A.
Both (A) and (R) are correct and (R) explains (A).
Both (A) and (R) are correct and (R) explains (A).
View full question & answer→
MCQ 81 Mark
Assertion (A) - Cr and Cu having $[ Ar ] 3 d^5 4 s^1$ and $[ Ar ] 3 d^{10} 4 s^1$ are more stable.
Reason (R) – The extra stability of elements Cr and Cu is due to symmetrical distribution of electrons and exchange energy.
  • ✓
    Both (A) and (R) are correct and (R) explains (A).
  • B
    Both (A) and (R) are correct but (R) is not the correct explanation of (A).
  • C
    (A) is correct but (R) is wrong.
  • D
    (A) is wrong but (R) is correct.
Answer
Correct option: A.
Both (A) and (R) are correct and (R) explains (A).
Both (A) and (R) are correct and (R) explains (A).
View full question & answer→
Generate Paper FreeAll Transition and Inner Transition Elements topics
Assertion And Reason. - Chemistry STD 12 Questions - Vidyadip