HARD

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Select the codes accordingly

I. ${HCO}_{2}^{-}$ A. Obtained through Solvay process

II. $K_{2} {CO}_{3}$ B. Green colour due to [Cr(H₂O)₆]³⁺

III. $S_{2} O_{3}^{2 -} + {FeCl}_{3}$ C. Reduces [Cu(C₄H₄O₆)₂]^2-

IV. ${SO}_{3}^{2 -} + K_{2} {Cr}_{2} O_{7} / H^{+}$ D. Green colouration

V. ${Na}_{2} {CO}_{3}$ E. Melts at 850^oC

I.	${HCO}_{2}^{-}$	A.	Obtained through Solvay process
II.	$K_{2} {CO}_{3}$	B.	Green colour due to [Cr(H₂O)₆]³⁺
III.	$S_{2} O_{3}^{2 -} + {FeCl}_{3}$	C.	Reduces [Cu(C₄H₄O₆)₂]^2-
IV.	${SO}_{3}^{2 -} + K_{2} {Cr}_{2} O_{7} / H^{+}$	D.	Green colouration
V.	${Na}_{2} {CO}_{3}$	E.	Melts at 850^oC

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Important Questions on The s-Block Elements

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

Identify the correct trend given below:

(Atomic No. = Ti : 22, Cr : 24 and Mo : 42)

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

Homoleptic octahedral complexes of a metal ion

' M^{3 +}'

with three monodentate ligands

L_{1}, L_{2} a n d L_{3}

absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The octahedral complex of a metal ion

M^{3 +}

with four monodentate ligands

L_{1}, L_{2}, L_{3} and L_{4}

absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is

HARD

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

When concentrated

HCl

is added to aqueous solution of

C o C l_{2}

, its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in reaction?

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The correct increasing order of trans-effect of the following species is

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The calculated spin-only magnetic moments

(B M)

of the anionic and cationic species out of

{[Fe {(H_{2} O)}_{6}]}^{+ 2}

and

{[Fe {(CN)}_{6}]}^{4 -}

respectively, are:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

In aqueous solution,

{[Co {(H_{2} O)}_{6}]}^{2 +} (X)

reacts with molecular oxygen in the presence of excess

{NH}_{3}

to give a new complex

Y .

The number of unpaired electrons in

X

and

Y

are, respectively

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The correct order of the spin –only magnetic moment of metal ions in the following low-spin complexes,

{[V {(C N)}_{6}]}^{4 -}, {[F e {(C N)}_{6}]}^{4 -}, {[R u {(N H_{3})}_{6}]}^{3 +}

and

{[C r {(N H_{3})}_{6}]}^{2 +},

is:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The correct increasing order for the wavelengths of absorption in the visible region for the complexes of

{Co}^{3 +}

is:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

Pick out the correct statement with respect to

[Mn (CN)_{6}]^{3 -} .

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The degenerate orbitals of

{[C r {(H_{2} O)}_{6}]}^{3 +}

are

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The complex that has highest crystal field splitting energy

(∆)

, is:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The complex ion that will lose its crystal field stabilization energy upon oxidation of metal to

+ 3

state is:

HARD

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

What is the correct electronic configuration of the central atom in

K_{4} [F e {(C N)}_{6}]

based on crystal field theroy?

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

Complete removal of both the axial ligands (along the

z - a x i s

) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).

HARD

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The incorrect statement is.

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

Three complexes,

{[C o C l {(N H_{3})}_{5}]}^{2 +} (I), {[C o {(N H_{3})}_{5} H_{2} O]}^{3 +} (I I)

and

{[C o {(N H_{3})}_{6}]}^{3 +} (I I I)

absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

The energies of

d_{xy} and d_{z}^{2}

orbitals in octahedral and tetrahedral transition metal complexes are such that

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

Jahn-Teller effect is not observed in high spin complexes of

HARD

Chemistry>Inorganic Chemistry>The s-Block Elements>Important Compounds of Group 1 Elements

Which of the following complex ions has electrons that are symmetrically filled in both

t_{2 g}

and

e_{g}

orbitals?

Select the codes accordingly I. HCO 2 - A. Obtained through Solvay process II. K2CO3 B. Green colour due to [Cr(H2O)6]3+ III. S 2 O 3 2 - + FeCl 3 C. Reduces [Cu(C4H4O6)2]2- IV. SO 3 2 - + K 2 Cr 2 O 7 / H + D. Green colouration V. Na2CO3 E. Melts at 850oC

Important Questions on The s-Block Elements

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