The inner transition element is not represented by the atomic
number among 59, 74, 95, 102, and 104.
1. 59
2. 95
3. 102
4. 104
Which of the following is the correct order of second ionization energy?
1. V > Cr > Mn
2. V < Cr < Mn
3. V < Cr > Mn
4. V > Cr < Mn
Dimethyl glyoxime in a suitable solvent was refluxed for 10 minutes with pure pieces of nickel sheet, it will result in
1. Red precipitate
2. Blue precipitate
3. Yellow precipitate
4. No precipitate
While Fe3+ is stable, Mn3+ is not stable in acidic solution because
1. O2 oxidises Mn2+ to Mn3+
2. O2 oxidises both Mn+2 to Mn+3 and Fe2+ to Fe3+
3. Fe3+ oxidises H2O to O2
4. Mn3+ oxidised H2O to O2
The incorrect statement about Re-Re bonding in [Re2X8]2- is
(1) Re-Re bond length is abnormally short
(2) Re-Re bond is comprised of one
(3) If Re-Re bond points along z-axis, then square planar ReX4 unit will use s, px, py and dx2-y2 orbitals for the formation of four Re-X bonds
(4) dxy orbitals will overlap to form -bond
Choose the correct statement regarding bonding in FeCl3 at high temperature?
(I) It contains 2c-2e- bond
(II) It contains 3c-2e- bond
(III) It contains a co-ordinate bond
1. (I), (II)
2. (I), (III)
3. (II), (III)
4. (I), (II) & (III)
Given lanthanoid ions ,the tendency to form the complexes is highest for:
1. Ce+3
2. Pm+2
3. Lu+3
4. Eu+2
The fusion of chromite ore (FeCr2O4) with Na2CO3 in air gives a yellow solution upon the addition of water. Subsequent treatment with H2SO4 produces an orange solution.
The yellow and orange colours, respectively, are due to the formation of:
1. Na2CrO4 and Na2Cr2O7
2. Cr(OH)3 and Na2Cr2O7
3. Cr2(CO3)3 and Fe2(SO4)3
4. Cr(OH)3 and Na2CrO4
Which of the following statements is false?
1. | V2+ < Cr2+ < Mn2+ < Fe2+ : Paramagnetic behaviour |
2. | Ni2+ < Co2+ < Fe2+ < Mn2+ : Ionic size |
3. | Co3+ < Fe3+ < Cr3+ < Sc3+ : Stability in aqueous solution |
4. | Sc < Ti < Cr < Mn : Number of oxidation states |
A substance is found to have a magnetic moment of 3.9 B.M. The ion may be
1. Fe+3
2. Mn+2
3. Co+2
4. Cu+2