The magnetic moment µ, of transition metals is related to the number of unpaired electrons, n as:

• μ = $\sqrt{\mathrm{n} \left(\mathrm{n} + 2\right)}$

• μ = n (n + 2)²

• μ = n² (n + 2)

• μ = n/ (n + 2)

The compound ZnFe₂O₄ is:

• a normal spinel compound

• a inverse spinel compound

• interstitial compound

• covalent compound

Ferrous ion charges to X ion, on reacting with acidified hydrogen peroxide. The number of d-electrons present in X and its magnetic moment (in BM) are, respectively :

• 6 and 6.93

• 5 and 5.92

• 5 and 4.9

• 4 and 5.92

454.

A complex compound of Co³⁺ with molecular formula CoCl_x. yNH, gives a total of 3 ions when dissolved in water. How many Cl^- ions satisfy both primary and secondary valencies is this complex?

• 3

• 1

• 4

• zero

Identify the correct order in which the covalent radius of the following elements increases

                    (I)Ti, (II) Ca, (III) Sc

• (I), (II), (III)

• (III), (II), (I)

• (II), (I), (III)

• (I), (III), (I)

Which of the following pair of transition metal ions, have the same calculated values of magnetic moment ?

• Ti²⁺ and V²⁺

• Fe²⁺ and Cu²⁺

• Cr²⁺ and Fe²⁺

• Co²⁺ and Ti²⁺

Which of the following is an example of interstitial hydride?

• NH₃

• CH₄

• ZnH₂

• H₂O

Identify the alkyne in the following sequence of reactions,

Alkyne _{$\underset{\mathrm{Lindlar}\text{'}\mathrm{s} \mathrm{catalyst}}{\overset{{\mathrm{H}}_2}{\to }}$ A $\stackrel{\mathrm{Ozonolysis}}{\to }$ B $\stackrel{\mathrm{Wacker} \mathrm{process}}{\leftarrow }$} CH₂=CH₂

• H₃C-C≡C-CH₃

• H₃C-CH₂-C≡CH

• H₂C=CH-C≡CH

• HC≡C-CH₂-C≡CH

Which of the following is a correct statement?

• Aqueous solutions of Cu⁺ and Zn²⁺ are colourless

• Aqueous solutions of Cu²⁺ and Zn²⁺ are colourless

• Aqueous solution of Fe³⁺ is green in colour

• Aqueous solution of MnO^-₄ is colourless

The percentage of lanthanides and iron respectively in misch metal are

• 50, 50

• 75, 25

• 90, 10

• 95, 5