Question 1: Palette 1/21

AP-EAPCET 2025 MCQ

Identify the ion (hydrated in solution) which is not correctly matched with its spin only magnetic moment (in BM) given in brackets

A

$\mathrm{Cr}^{3+}(4.90)$

B

$\mathrm{Cu}^{2+}(1.73)$

C

$\mathrm{Co}^{3+}(4.90)$

D

$\mathrm{Fe}^{2+}(4.90)$

Question 2: Palette 2/21

AP-EAPCET 2025 MCQ

Which one of the following statements is not correct?

A

CrO is basic but $\mathrm{Cr}_2 \mathrm{O}_3$ is amphoteric.

B

Nitrite is oxidised to nitrate in acidic medium by $\mathrm{KMnO}_4$.

C

$\mathrm{PdCl}_2$ is the catalyst in Wacker process.

D

The reactivity of the earlier members of lanthanide series is similar to that of aluminium.

Question 3: Palette 3/21

AP-EAPCET 2025 MCQ

The amphoteric oxide of vanadium ( V ) reacts with alkali and forms an oxo ion ' $X$ ' and with acid forms an oxo ion $Y$. The oxidation states of ' V ' in $X$ and $Y$ are respectively

A

$+2,+5$

B

$+3,+3$

C

$+5,+5$

D

$+5,+2$

Question 4: Palette 4/21

AP-EAPCET 2025 MCQ

How many of the following lanthanide elements exhibit +4 oxidation state?

Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy

A

5

B

4

C

3

D

6

Question 5: Palette 5/21

AP-EAPCET 2025 MCQ

$ \text { Match the following } $

$ \text { List-I (Aquated ion) } $		$ \text { List-II (Colour) } $
(A)	$\mathrm{Ni}^{2+}$	(I)	Violet
(B)	$\mathrm{Fe}^{3+}$	(II)	Blue
(C)	$\mathrm{Mn}^{3+}$	(III)	Yellow
(D)	$\mathrm{V}^{4+}$	(IV)	Red
		(V)	Green

Correct answer is

A

A-V, B-III, C-IV, D-II

B

A-IV, B-V, C-I, D-III

C

A-I, B-III, C-IV, D-V

D

A-V, B-III, C-I, D-II

Question 6: Palette 6/21

AP-EAPCET 2025 MCQ

The ion with $4 f^7$ configuration is

A

$\mathrm{Pr}^{3+}$

B

$\mathrm{Lu}^{3+}$

C

$\mathrm{Eu}^{2+}$

D

$\mathrm{Ce}^{4+}$

Question 7: Palette 7/21

AP-EAPCET 2024 MCQ

The correct order of oxidising power of the given ions is

A

$\mathrm{VO}_2^{+}<\mathrm{Cr}_2 \mathrm{O}_7^{2-}<\mathrm{MnO}_4^{-}$

B

$\mathrm{VO}_2^{+}<\mathrm{MnO}_4^{-}<\mathrm{Cr}_2 \mathrm{O}_7^{2-}$

C

$\mathrm{MnO}_4^{-}<\mathrm{Cr}_2 \mathrm{O}_7^{2-}<\mathrm{VO}_2^{+}$

D

$\mathrm{Cr}_2 \mathrm{O}_7^{2-}<\mathrm{VO}_2^{+}<\mathrm{MnO}_4^{-}$

Question 8: Palette 8/21

AP-EAPCET 2024 MCQ

Which of the following lanthanoids have [Xe] $4 f^x 5 d^1 6 s^2$ configuration in their ground state. $ (X=1-14) $

A

$\mathrm{Pr}, \mathrm{Tb}, \mathrm{Yb}$

B

$\mathrm{Ce}, \mathrm{Yb}, \mathrm{Lu}$

C

$\mathrm{Ce}, \mathrm{Gd}$, Lu

D

Gd, Tb, Lu

Question 9: Palette 9/21

AP-EAPCET 2024 MCQ

Match the following.

List I	List II
A. Technicium	I. Non-metal
B. Fluorine	II. Transition metal
C. Tellurium	III. Lanthanoid
D. Dysprosium	IV. Metalloid

A

A-II, B-I, C-III, D-IV

B

A-III, B-I, C-IV, D-II

C

A-II, B-I, C-IV, D-III

D

A-IV, B-I, C-II, D-III

Question 10: Palette 10/21

AP-EAPCET 2024 MCQ

The transition metal with highest melting point is

A

Re

B

Cr

C

Mo

D

W

Question 11: Palette 11/21

AP-EAPCET 2024 MCQ

Which transition metal does not form 'MO' type oxide? ( $M=$ transition metal)

A

$V$

B

Cr

C

Mn

D

Sc

Question 12: Palette 12/21

AP-EAPCET 2022 MCQ

Identify the isoelectronic pair of ions from the following.

A

$\mathrm{Pr}^{3+}, \mathrm{Nd}^{3+}$

B

$\mathrm{Tb}^{3+}, \mathrm{Dy}^{2+}$

C

$\mathrm{Eu}^{2+}, \mathrm{Gd}^{3+}$

D

$\mathrm{Pr}^{3+}, \mathrm{Ce}^{4+}$

Question 13: Palette 13/21

AP-EAPCET 2022 MCQ

Assertion (A) Transition metals and their complexes show catalytic activity.

Reason (R) The activation energy of a reaction is lowered by the catalyst.

A

Both A and R are correct and R is the correct explanation of A.

B

Both A and R are correct but R is not the correct explanation of A.

C

A is correct but R is incorrect.

D

A is incorrect but R is correct.

Question 14: Palette 14/21

AP-EAPCET 2021 MCQ

A purple coloured compound of manganese $(X)$ decomposes on heating to liberate oxygen and forms compounds of manganese $Y$ and $Z$. Compound $Z$ reacts with $\mathrm{KOH}$ in presence of potassium nitrate to give compound $Y$. Compounds $X, Y$ and $Z$ respectively are

A

$X-\mathrm{KMnO}_4, Y-\mathrm{Mn}_2 \mathrm{O}_7, Z-\mathrm{MnO}_2$

B

$X-\mathrm{K}_2 \mathrm{MnO}_4, Y-\mathrm{KMnO}_4, Z-\mathrm{Mn}_2 \mathrm{O}_7$

C

$X-\mathrm{KMnO}_4, Y-\mathrm{K}_2 \mathrm{MnO}_4, Z-\mathrm{MnO}_2$

D

$\mathrm{X}-\mathrm{KMnO}_4, \mathrm{Y}-\mathrm{MnO}_2 . Z-\mathrm{MnO}$

Question 15: Palette 15/21

AP-EAPCET 2021 MCQ

Match the following columns and choose the correct code.

	Column I (Property)		Column II (Metal)
A.	Element with highest second ionisation enthalpy $(\Delta_i H_2)$	1.	CO
B.	Element with highest third ionisation enthalpy $(\Delta_i H_3)$	2.	Cr
C.	M in [M(CO)$_6$]	3.	Cu
D.	Element with highest heat of atomisation $(\Delta_a H)$	4.	Zn
		5.	Ni

A

A - 3, B - 1, C - 5, D - 4

B

A - 3, B - 4, C - 2, D - 5

C

A - 4, B - 1, C - 2, D - 3

D

A - 5, B - 4, C - 1, D - 3

Question 16: Palette 16/21

AP-EAPCET 2021 MCQ

Which of the following is not arranged in the correct sequence?

A

$\mathrm{MO}, \mathrm{M}_2 \mathrm{O}_3, \mathrm{MO}_2, \mathrm{M}_2 \mathrm{O}_5$ (Decreasing basic nature)

B

Sc, V, Cr, Mn (Increasing number of oxidation states)

C

$d^5, d^3, d^1, d^4$ (Increasing magnetic moment)

D

$\mathrm{Mn}^{2+}, \mathrm{Fe}^{2+}, \mathrm{Cr}^{2+}, \mathrm{Co}^{2+}$ (Decreasing stability)

Question 17: Palette 17/21

AP-EAPCET 2021 MCQ

Which among the following is coloured?

A

CuCl

B

ScCl$_3$

C

CuCl$_2$

D

TiCl$_4$

Question 18: Palette 18/21

AP-EAPCET 2021 MCQ

The electronic configuration of $\mathrm{Fe}^{3+}$ is (atomic number of $\mathrm{Fe}=26$ )

A

$[\mathrm{Ar}] 3 d^5 4 s^1$

B

$[\mathrm{Ar}] 3 d^6 4 s^0$

C

$[\mathrm{Ar}] 3 d^5 4 s^0$

D

$[\mathrm{Ar}] 3 d^6 4 s^2$

Question 19: Palette 19/21

AP-EAPCET 2021 MCQ

The magnetic moment of Fe$^{2+}$ is ........ BM.

A

3.87

B

0

C

4.9

D

1.73

Question 20: Palette 20/21

AP-EAPCET 2021 MCQ

Which of the following statement is not correct?

A

$\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}$ redox couple has less positive electron potential than $\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}$ couple.

B

$\mathrm{MnO}_4^{2-}$ is a strong oxidising agent but $\mathrm{CrO}_4^{2-}$ is not.

C

The second and third series of transition elements have almost similar atomic radii.

D

The E$\Upsilon$ value for $\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}$ couple is much more positive than for $\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}$ couple.

Question 21: Palette 21/21

AP-EAPCET 2021 MCQ

To which group of the periodic table does an element having electronic configuration [Ar] 3d$^5$ 4s$^2$ belong?

A

Second

B

Fourth

C

Seventh

D

Third