List of top Chemistry Questions on d block elements asked in JEE Main

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

\(K_2Cr_2O_7\) paper acidified with dil. \(H_2SO_4\) turns green when exposed to :

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 :

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:

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 statement that is INCORRECT about the interstitial compounds is :

The incorrect statement is :

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?

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 $V = 23$)

Which series of reactions correctly represents chemical relations related to iron and its compound?

Consider the following reaction, $xMnO_4^- + yC_2O_4^{2-}+zH^+ \rightarrow xMn^{2+}+2yCO_2 + \frac{z}{2}H_2O$ The values of x, y and z in the reaction are, respectively

Four successive members of the first row transition elements listed below with atomic numbers. Which one of them is expected to have the highest $E_{m{^{3+}}/m{^{2+}}}^{\circ}$value?

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

Which of the following d-block elements has maximum unpaired electron in ground state electronic configuration?

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).