General
✓✗The basic character of the transition metal monoxides follows the order (At. nos. Ti = 22, V = 23, Cr = 24, Fe = 26)
- TiO > VO > CrO > FeO
- VO > CrO > TiO > FeO
- TiO > FeO > VO > CrO
- CrO > VO > FeO > TiO
General
✓✗The spin-only magnetic moment of Ti3+ (Z = 22) is
- 2.83 BM
- 0.00 BM
- 3.87 BM
- 1.73 BM
General
✓✗Which of the following is formed when Cu2+ reacts with excess KI?
- Cu and I2
- CuI2 only
- Cu2I2 and I2
- [CuI4]2−
General
✓✗Which of the following is the strongest oxidising agent in aqueous solution?
- Ti3+
- Mn3+
- Cr3+
- V3+
General
✓✗The reason why transition metal ions form coloured complexes is that
- the complexes are always paramagnetic
- the metal ions lose all d electrons
- the ligands split the d orbitals, allowing d−d transitions in the visible region
- the ligands themselves are always coloured
General
✓✗Assertion: Actinoids show a larger number of oxidation states than lanthanoids.
Reason: The 4f orbitals are less deeply buried than the 5f orbitals.
Reason: The 4f orbitals are less deeply buried than the 5f orbitals.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Assertion is false but Reason is true
General
✓✗The electronic configurations of Eu (Z = 63), Gd (Z = 64) and Tb (Z = 65) are
- [Xe]4f65d16s2, [Xe]4f75d16s2 and [Xe]4f85d16s2
- [Xe]4f76s2, [Xe]4f86s2 and [Xe]4f85d16s2
- [Xe]4f65d16s2, [Xe]4f75d16s2 and [Xe]4f96s2
- [Xe]4f76s2, [Xe]4f75d16s2 and [Xe]4f96s2
General
✓✗Chromite ore fused with Na2CO3 in air gives a yellow compound P. P on acidification gives an orange compound Q, which with KCl gives R. P, Q and R are, respectively,
- Cr2O3, CrO3 and KCrO2
- Na2CrO4, Na2Cr2O7 and K2Cr2O7
- Na2CrO4, CrO3 and K2CrO4
- Na2Cr2O7, Na2CrO4 and K2CrO4
General
✓✗Which of the following statements is not true?
- K2Cr2O7 solution in acidic medium is orange
- Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis
- K2Cr2O7 solution becomes yellow on increasing the pH beyond 7
- On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed
General
✓✗Which of the following ions has the electronic configuration [Ar]3d6? (At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)
- Co3+
- Fe3+
- Ni3+
- Mn3+
General
✓✗Which of the following shows the maximum number of oxidation states?
- V
- Cr
- Mn
- Fe
General
✓✗The irregular variation of ionisation enthalpies across the 3d series is mainly due to
- the absence of 4s electrons
- constant atomic radius
- the varying stability of different d configurations (such as d0, d5, d10)
- equal nuclear charge
General
✓✗Why are interstitial compounds very hard and high melting?
- They contain ionic bonds only
- They have weak metallic bonds
- They are covalent molecular solids
- The small atoms occupy voids and strengthen the metal lattice
General
✓✗Statement I: The oxidation state of Mn in MnO2 formed from KMnO4 in neutral medium is +4.
Statement II: In neutral medium, one MnO4− accepts five electrons.
Statement II: In neutral medium, one MnO4− accepts five electrons.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗In acidic solution, the manganate ion disproportionates. The products are
- Mn2+ and MnO2
- MnO4− and MnO2
- Mn3+ and MnO4−
- Mn and MnO4−