1
KCET 2025
MCQ (Single Correct Answer)
+1
-0

In the following pairs, the one in which both transition metal ions are colourless is

A
$\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}$
B
$\mathrm{V}^{2+}, \mathrm{Ti}^{3+}$
C
$\mathrm{Zn}^{2+}, \mathrm{Mn}^{2+}$
D
$\mathrm{Ti}^{4+}, \mathrm{Cu}^{2+}$
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

In the reaction between hydrogen sulphide and acidified permanganate solution,

A
$\mathrm{H}_2 \mathrm{~S}$ is reduced to $\mathrm{S}, \mathrm{MnO}_4^{-}$is oxidised to $\mathrm{Mn}^{2+}$
B
$\mathrm{H}_2 \mathrm{~S}$ is oxidised to $\mathrm{SO}_2, \mathrm{MnO}_4^{-}$is reduced to $\mathrm{MnO}_2$
C
$\mathrm{H}_2 \mathrm{~S}$ is reduced to $\mathrm{SO}_2, \mathrm{MnO}_4^{-}$is oxidised to $\mathrm{Mn}^{2+}$
D
$\mathrm{H}_2 \mathrm{~S}$ is oxidised to $\mathrm{S}, \mathrm{MnO}_4^{-}$is reduced to $\mathrm{Mn}^{2+}$
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

A member of the Lanthanoid series which is well known to exhibit +4 oxidation state is

A
Samarium
B
Europium
C
Erbium
D
Cerium
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

In which of the following pairs, both the elements do not have $(n-1) d^{10} n s^2$ configuration?

A
$\mathrm{Cu}, \mathrm{Zn}$
B
$\mathrm{Zn}, \mathrm{Cd}$
C
$\mathrm{Cd}, \mathrm{Hg}$
D
$\mathrm{Ag}, \mathrm{Cu}$
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