1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Match the following characteristics of transition metals given in Column I with the examples listed in Column II

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 $$\mathrm{SnCl_2}$$

A
$$ \mathrm{W}=\mathrm{B} \quad \mathrm{X}=\mathrm{C} \quad \mathrm{Y}=\mathrm{D} \quad \mathrm{Z}=\mathrm{A} $$
B
$$ \mathrm{W}=\mathrm{C} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{A} \quad \mathrm{Z}=\mathrm{B} $$
C
$$ \mathrm{W}=\mathrm{C} \quad \mathrm{X}=\mathrm{A} \quad \mathrm{Y}=\mathrm{D} \quad \mathrm{Z}=\mathrm{B} $$
D
$$ \mathrm{W}=\mathrm{A} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{C} \quad \mathrm{Z}=\mathrm{B} $$
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-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.

A
$$ \mathrm{W}=\mathrm{C} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{A} \quad \mathrm{Z}=\mathrm{B} $$
B
$$ \mathrm{W}=\mathrm{B} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{C} \quad \mathrm{Z}=\mathrm{A} $$
C
$$ \mathrm{W}=\mathrm{D} \quad \mathrm{X}=\mathrm{C} \quad \mathrm{Y}=\mathrm{A} \quad \mathrm{Z}=\mathrm{B} $$
D
$$ \mathrm{W}=\mathrm{D} \quad \mathrm{X}=\mathrm{C} \quad \mathrm{Y}=\mathrm{B} \quad \mathrm{Z}=\mathrm{A} $$
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the incorrect statement.

A
Ability of Fluorine to stabilise higher oxidation states in transition metals is due to the low lattice enthalpy of the fluorides.
B
The second and third Ionisation enthalpies of $$\mathrm{Mn}^{2+}$$ and $$\mathrm{Fe}^{3+}$$ respectively have lower values than expected.
C
Transition metals readily form alloys because their metallic radii are within about $$15 \%$$ of each other.
D
$$\mathrm{Cr}^{2+}$$ acts as reducing agent while $$\mathrm{Mn}^{3+}$$ acts as an oxidising agent though both the ions have $$\mathrm{d}^4$$ configuration.
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-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

A
acidified potassium chromate
B
alkaline potassium dichromate
C
acidified potassium manganate
D
acidified potassium permanganate
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