541.

In which of the following pairs are both the ions coloured in aqueous solution?

(At. no.: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 2)

• Ni²⁺, Ti³⁺

• Sc³⁺, Ti³⁺

• Sc³⁺,Co²⁺

• Sc³⁺,Co²⁺

Which of the following is not chiral 

• 2-butanol

• 2,3 -dibromo pentane

• 3- bromopentane

• 3- bromopentane

[Co(NH₃)₄(NO₂)₂]Cl exhibits:

• linkage isomerism, ionisation isomerism and optical isomerism

• Linkage isomerism, ionisation isomerism and geometrical isomerism

• ionization isomerism, geometrical isomerism and optical isomerism

• ionization isomerism, geometrical isomerism and optical isomerism

[Cr(H₂O)₆]Cl₃ (at. no. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution of 3d electrons in the chromium of the complex is:

The number of unpaired electrons in a paramagnetic  diatomic molecule of an element with atomic number 6 is:

• 2

• 3

• 4

• 4

An example of a sigma bonded organometallic compound is :

• Ruthenocene

• Grignard's reagent

• Ferrocene

• Ferrocene

The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with the complexes: CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃ respectively is

• 1 AgCl, 3 AgCl, 2 AgCl

• 3 AgCl, 1 AgCl, 2 AgCl

• 3 AgCl, 2 AgCl, 1 AgCl

• 3 AgCl, 2 AgCl, 1 AgCl

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is

• [Co(en)_3]³⁺, [Co(NH₃)₆]³⁺, [Co(H₂O)₆]³⁺

• [Co(H₂O)₆]³⁺, [Co(en)₃]³⁺, [Co(NH₃)₆]³⁺

• [Co(H₂O)₆]³⁺, [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺

• [Co(H₂O)₆]³⁺, [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺

Pick out the correct statement with respect
[Mn(CN)_6]^3–

• It is sp³d² hybridised and octahedral

• It is sp³d² hybridised and tetrahedral

• It is d²sp³ hybridised and octahedral

• It is d²sp³ hybridised and octahedral

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :

Column I		Column II
a.	Co3+	i.
b.	Cr3+	ii.	$\sqrt{35} BM$
c.	Fe3+	iii.	$\sqrt{3} BM$
d.	Ni2+	iv.	$\sqrt{24} BM$
		v.	$\sqrt{15} BM$

• a	b	c	d
  iv	v	ii	i

• a	b	c	d
  i	ii	iii	iv

• a	b	c	d
  iii	v	i	ii

• a	b	c	d
  iv	i	ii	iii