11.

Sometimes explosion occurs while distilling ethers. It is due to the presence of

• peroxides

• oxides

• ketones

• aldehydes

Amongst Ni(CO)₄, [Ni(CN)₄]^2- and $\left[{\mathrm{NiCl}}_4^{2-}\right]$

• Ni(CO)₄ and $\left[{\mathrm{NiCl}}_4^{2-}\right]$ are diamagentic but [Ni(CN)₄]^2- is paramagnetic.

• Ni(CO)₄ and [Ni(CN)₄]^2- are diamagnetic but ${\mathrm{NiCl}}_4^{2-}$ is paramagnetic.

• ${\mathrm{NiCl}}_4^{2-}$ and [Ni(CN)₄]^2- are diamagnetic but Ni(CO)₄ is paramagnetic.

• Ni(CO)₄ is diamagnetic but ${\mathrm{NiCl}}_4^{2-}$ and [Ni(CN)₄]^2- is paramagnetic.

The equivalent conductances of two ions at infinite dilution in water at 25°C are given below

          $$\begin{gathered} {\mathrm{\Lambda }}_{{\mathrm{Ba}}^{2+}}^{°}= 127.00 {\mathrm{Scm}}^2/\mathrm{equiv}. \\ {\mathrm{\Lambda }}_{{\mathrm{Cl}}^{-}}^{°} = 76.00 {\mathrm{Scm}}^2/ \mathrm{equiv}. \end{gathered}$$

The equivalent conductance (in Scm²/equiv) of BaCl₂ at infinite dilution will be

• 203

• 279

• 205.5

• 139.5

Mn₂O₇ dissolves in water to give an acid. The colour of the acid is

• green

• blue

• purple

• red

• 7.5% Ag and 92.5% Cu

• 92.5% Ag and 7.5% Cu

• 80% Ag and 20% Cu

• 90% Ag and 10% Cu

In which of the following octahedral complexes of Co (At. no. 27), will the magnitude of ${∆}_{\circ }$ be the highest?

• [Co(CN)₆]^3-

• [Co(C₂O₄)₃]^3-

• [Co(H₂O)₆]³⁺

• [Co(NH₃)₆]³⁺

Assertion (A): Cu²⁺ and Cd²⁺ are separated by first adding KCN solution and then passing H-S gas.
Reason (R): KCN reduces Cu²⁺ to Cu⁺ and forms a complex with it.
The correct answer is

• Both (A) and (R) are true and (R) is the correct explanation of (A)

• Both (A) and (R) are true but (R) is not the correct explanation of (A)

• (A) is true but (R) is not true

• (A) is not true but (R) is true

The effective atomic number of cobalt in the complex [Co(NH₃)₆]⁺ is

• 36

• 24

• 33

• 30

The IUPAC name for the complex [Co(NO₂)(NH₃)₅]Cl, is

• nitrito-N-pentammine cobalt (III) chloride

• nitrito-N-pentammine cobalt (II) chloride

• pentaminenitrito-N-cobalt (II) chloride

• pentaminenitrito-N-cobalt (III) chloride

Tetragonal crystal system has the following unit cell dimensions

• $\mathrm{a}=\mathrm{b}=\mathrm{c}, \mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }=90°$

• $\mathrm{a}=\mathrm{b}\ne \mathrm{c}, \mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }=90°$

• $\mathrm{a}\ne \mathrm{b}\ne \mathrm{c},\mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }=120°$

• $\mathrm{a}=\mathrm{b}\ne \mathrm{c},\mathrm{\alpha }=\mathrm{\beta }=90°, \mathrm{\gamma }=120°$