COMEDK 2023 Evening Shift | d and f Block Elements Question 3 | Chemistry

S. No.	Characteristic properties	S. No.	Examples
W	Chemically inert, non-stoichiometric compound	A	$$\mathrm{WO}_3$$
X	Higher oxidation states are more stable	B	$$\mathrm{TiCl_4}$$
Y	Due to inert pair effect, lower oxidation state is more stable	C	$$\mathrm{Mn_4N}$$
Z.	Colourless compound of transition metal	D	$$\mathrm{SnCl_2}$$

$$ \mathrm{W}=\mathrm{B} \quad \mathrm{X}=\mathrm{C} \quad \mathrm{Y}=\mathrm{D} \quad \mathrm{Z}=\mathrm{A} $$

$$ \mathrm{W}=\mathrm{C} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{A} \quad \mathrm{Z}=\mathrm{B} $$

$$ \mathrm{W}=\mathrm{C} \quad \mathrm{X}=\mathrm{A} \quad \mathrm{Y}=\mathrm{D} \quad \mathrm{Z}=\mathrm{B} $$

$$ \mathrm{W}=\mathrm{A} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{C} \quad \mathrm{Z}=\mathrm{B} $$

COMEDK 2023 Evening Shift

MCQ (Single Correct Answer)

-0

Find the correct matches of the substances, given in Column I, from their characteristic properties given in Column II.

S.No.	Column I	S.No.	Column II
W	$$ \mathrm{Tl} $$	A	Decomposes steam to form its dioxide and dihydrogen gas.
X	$$ \mathrm{CCl}_4 $$	B	Consists of twenty 6 -membered rings and twelve 5 membered rings.
Y	$$\mathrm{Tin}$$	C	+3 oxidation state is highly oxidising.
Z	$$ \mathrm{C_{60}} $$	D	Electron precise species, neither acts as electron donor nor as electron acceptor.

$$ \mathrm{W}=\mathrm{C} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{A} \quad \mathrm{Z}=\mathrm{B} $$

$$ \mathrm{W}=\mathrm{B} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{C} \quad \mathrm{Z}=\mathrm{A} $$

$$ \mathrm{W}=\mathrm{D} \quad \mathrm{X}=\mathrm{C} \quad \mathrm{Y}=\mathrm{A} \quad \mathrm{Z}=\mathrm{B} $$

$$ \mathrm{W}=\mathrm{D} \quad \mathrm{X}=\mathrm{C} \quad \mathrm{Y}=\mathrm{B} \quad \mathrm{Z}=\mathrm{A} $$

COMEDK 2023 Evening Shift

MCQ (Single Correct Answer)

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Identify the incorrect statement.

Ability of Fluorine to stabilise higher oxidation states in transition metals is due to the low lattice enthalpy of the fluorides.

The second and third Ionisation enthalpies of $$\mathrm{Mn}^{2+}$$ and $$\mathrm{Fe}^{3+}$$ respectively have lower values than expected.

Transition metals readily form alloys because their metallic radii are within about $$15 \%$$ of each other.

$$\mathrm{Cr}^{2+}$$ acts as reducing agent while $$\mathrm{Mn}^{3+}$$ acts as an oxidising agent though both the ions have $$\mathrm{d}^4$$ configuration.

COMEDK 2021

MCQ (Single Correct Answer)

-0

An aqueous solution of X on addition of hydrogen peroxide in ice cold conditions gives blue colour to the ethereal layer. Then, X can be

acidified potassium chromate

alkaline potassium dichromate

acidified potassium manganate

acidified potassium permanganate

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