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1
KCET 2022
MCQ (Single Correct Answer)
+1
-0

The only lanthanoid which is radioactive

A
cerium
B
promethium
C
praseodymium
D
lanthanum
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Which of the following does not represent property stated against it?

A
$$\mathrm{CO}^{2+}<\mathrm{Fe}^{2+}<\mathrm{Mn}^{2+}$$ - Ionic size
B
$$\mathrm{Ti}<\mathrm{V}<\mathrm{Mn}$$ - Number of oxidation states
C
$$\mathrm{Cr}^{2+}<\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}$$ - Paramagnetic behaviour
D
$$\mathrm{Sc}>\mathrm{Cr}>\mathrm{Fe}$$ - Density
3
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Which one of the following is correct for all elements from Sc to Cu?

A
The lowest oxidation state shown by them is +2
B
$$4 s$$ orbital is completely filled in the ground state
C
$$3 d$$ orbital is not completely filled in the ground state
D
The ions in +2 oxidation states are paramagnetic
4
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Which of the following pairs has both the ions coloured in aqueous solution? [Atomic numbers of

$$\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=29, \mathrm{Mn}=25]$$

A
$$\mathrm{Sc}^{3+}, \mathrm{Mn}^{2+}$$
B
$$\mathrm{Ni}^{2+}, \mathrm{Ti}^{4+}$$
C
$$\mathrm{Ti}^{3+}, \mathrm{Cu}^{+}$$
D
$$\mathrm{Mn}^{2+}, \mathrm{Ti}^{3+}$$
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