List of top Chemistry Questions on d block elements

Assertion (A): Highest oxidation state of Mn is +7 in most of the transition elements.
Reason (R): Transition metals exhibit variable oxidation states.

Assertion (A): Zinc, cadmium and mercury are not considered as transition elements. Reason (R): These elements have completely filled $d$ orbitals in their ground state as well as in their common oxidation states. Choose the correct option:

Which of the following statement is correct regarding an element having atomic number 79?

Which of the following statements are true? (i) Mn has highest oxidation state in $ \text{Mn}_2\text{O}_7 $ (ii) $ \text{MnO} $ is more ionic than $ \text{Mn}_2\text{O}_7 $ (iii) $ \text{Mn}_2\text{O}_7 $ has one bridging O atom (iv) Oxidation state of Mn is generally maximum in oxo compounds

Among, Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _______BM (in nearest integer).

Given below are two statements :
Statement I : CrO$ _3 $ is a stronger oxidizing agent than MoO$ _3 $
Statement II : Cr(VI) is more stable than Mo(VI) In the light of the above statements, choose the correct answer from the options given below

Pair of transition metal ions having the same number of unpaired electrons is :

Which of the following oxides is paramagnetic?

Calculate the number of unpaired electrons in [Mn(H₂O)₆]²⁺, considering H₂O as a weak field ligand. (Atomic number of Mn = 25)

Which of the following oxides will be the most basic: Ti (22), V (23), Cr (24), Fe (26)?

The main constituents of stainless steel are:

This oxide is most basic. [Ti=22, V=23, Cr=24, Fe=26]

The electronic configuration of Cu(II) is 3d⁹ whereas that of Cu(I) is 3d¹⁰. Which of the following is correct ?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): $Cu ^{2+}$ in water is more stable than $Cu ^{+}$
Reason (R): Enthalpy of hydration for $Cu ^{2+}$ is much less than that of $Cu ^{+}$
In the light of the above statements, choose the correct answer from the options given below :

$K_2Cr_2O_7$ paper acidified with dil. $H_2SO_4$ turns green when exposed to :

The correct statement about d-block elements, is

Given below are two statements:
Statement I: Nickel is being used as the catalyst for producing syn gas and edible fats.
Statement II : Silicon forms both electron rich and electron deficient hydrides.
In the light of the above statements, choose the most appropriate answer from the options given below:

The set of correct statements is :
(i) Manganese exhibits +7 oxidation state in its oxide.
(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.
(iii) Sc shows +4 oxidation state which is oxidizing in nature.
(iv) Cr shows oxidising nature in +6 oxidation state.

Match List I with List II

LIST I Complex		LIST II Colour
A.	Mg(NH₄)PO₄	I.	brown
B.	K₃[Co(NO₂)₆]	II.	white
C.	MnO(OH)₂	III.	yellow
D.	Fe₄[Fe(CN)₆]₃	IV.	blue

Choose the correct answer from the options given below:

Among Co³⁺, Ti²⁺, V²⁺ and Cr²⁺ions, one if used as a reagent cannot liberate H₂ from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is________ B.M. (Nearest integer)

If $[Cu(H_2O)_4]^{2+}$ absorbs a light of wavelength 600 nm for d-d transition, then the value of octahedral crystal field splitting energy for [$Cu(H_2O)_6]^{2+}$ will be _______ $×10^{–21} J$. [Nearest integer]
(Given : h = $6.63 × 10^{–34} Js$ and $c = 3.08×10^8 ms^{–1}$)

The statement that is INCORRECT about the interstitial compounds is :

The colour of $KMnO_4 $ is due to

Chloro compound of Vanadium has only spin magnetic moment of $1.73\, BM$. This Vanadium chloride has the formula : (at. no. of $V = 23$)

An element of d-block (Z) of 4th period has spin only magnetic moment of its $Z^{3+}$ form is 3.9 BM, then find minimum atomic number of element (Z).