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1
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Choose the incorrect statement from the following

A
The ability of Fluorine to stabilise the higher oxidation states of transition metals exceeds that of Oxygen
B
$$\mathrm{Cu}$$ (I) compounds in aqueous medium undergo disproportionation reaction
C
$$\mathrm{Cr}^{2+}$$ is a stronger reducing agent than $$\mathrm{Fe}^{2+}$$
D
$$\mathrm{MoO}_3$$ and $$\mathrm{WO}_3$$ are not as strong oxidants as $$\mathrm{CrO}_3$$
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$\mathrm{Ti}^{2+}$$ is purple while $$\mathrm{Ti}^{4+}$$ is colourless because

A
$$\mathrm{Ti}^{2+}$$ has $$3 d^2$$ configuration
B
$$\mathrm{Ti}^{4+}$$ has $$3 d^2$$ configuration
C
$$\mathrm{Ti}^{2+}$$ is very small cation when compared to $$\mathrm{Ti}^{2+}$$ and hence, doesn't absorb any radiation
D
There is no crystal field effect in $$\mathrm{Ti}^{4+}$$
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A volatile compound is formed by carbon monoxide and

A
Cu
B
Al
C
Ni
D
Si
4
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
$$ \mathrm{W}=\mathrm{A} \quad \mathrm{X}=\mathrm{D} \quad \mathrm{Y}=\mathrm{C} \quad \mathrm{Z}=\mathrm{B} $$
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