All Free Chemistry MCQs with Answers

• A. K4 [Fe(CN)6]
• B. [Co(NO2)3(NH3)3]
• C. [Cu(NH3)4]SO4
• D. .[MnCl4]-2

Explanation: In C option central metal atom and coordination sphere has same charge [Cu+2(NH3)04]+2SO4-2 Here the coordination sphere has a +2 sign and…

• A. Zn
• B. Cu
• C. Hg
• D. As

Explanation: "Cu" is used as catalyst in oxidation of lower alkanes.CH4+[O] Cu/400oC→200 atom CH3 -OH.

• A. Cu
• B. Co
• C. Zn
• D. Fe

Explanation: Finely divided "Fe" is used as a catalyst in Haber process. Cr2O3+ MgO + SiO2 is used as promoter.N2 +3H2 Fe/MgO/Cf2O3/SiO,⇌450°C/200 atom…

• A. Sulphuric acid
• B. Plastics
• C. Ethanol
• D. Tetraethyl lead

Explanation: TiCl4 is a key component in the Ziegler-Natta catalyst system, which is essential for the polymerization of ethylene into polyethylene, a…

• A. Coordination number
• B. Coordination sphere
• C. Oxidation number
• D. Charge on coordination sphere

Explanation: [Fe(CN)6]-4 The algebraic sum of charges on central metal ion and ligand is -4. It is the charge on the coordination sphere.

• A. Cation, Coordination Sphere, Anion
• B. Coordination Sphere, Cation, Anion
• C. Cation, Anion, Coordination Sphere
• D. Anion, Coordination Sphere, Cation

Explanation: It is a basic rule of nomenclature of complex compounds that cations are named before anions.

• A. Simple ions only
• B. Complex ions only
• C. Complex ions and simple ions
• D. Weak acid HCN

Explanation: When K4[Fe(CN)6] is dissolved in a salt solution, it dissociates into simple ions and complex ions.

• A. Covalent bonds
• B. Co-ordinate covalent bond
• C. lonic bonds
• D. All of these

Explanation: In coordination compounds, ligands are Lewis bases and central metal atom are Lewis acid so these form coordinate covalent bond.

• A. [Cu(H2O)6]2+
• B. [Pt(C2O4)2]2-
• C. [CuCl]2-
• D. All have the same stability

Explanation: The stability of a coordination complex often depends on the nature of the ligands.

• A. Anionic in nature always
• B. Neutral in nature always
• C. Cationic in nature always
• D. All are possible

Explanation: A. Anionic coordination sphere Ka[Fe(CN)6]B. Neutral coordination sphere [Fe(CO)s]C. Cationic coordination sphere [Cu(NH3)4]SO4

• A. Orbitals of s-subshell
• B. Orbitals of d-subshell
• C. Orbitals of p-subshell
• D. Both A and B

Explanation: When d-orbitals are involved in bonding, they split into two energy levels (lower and higher).

• A. Fe
• B. Cr
• C. Zn
• D. Cu

Explanation: Amongst the given options only Zn shows one stable oxidation state that is +2.

• A. Linear
• B. Trigonal bipyramid
• C. Square planar
• D. Octahedral

Explanation: Many transition metal complexes adopt octahedral geometries, with six donor atoms forming bond angles of 90° about the central atom with…

• A. Mn
• B. Cr
• C. Fe
• D. Ni

Explanation: Electronic configuration of Cr= Cr = (Ar) 3d5 4s1. According to the electronic configuration, the number of unpaired electrons is 6.

• A. 2
• B. 4
• C. 3
• D. 5

Explanation: Copper Sulfate Pentahydrate Structure: In CuSO₄·5H₂O, the copper ion (Cu²⁺) is surrounded by five water molecules.Coordinate Covalent…

• A. Yellow
• B. Green
• C. Blue
• D. Red

Explanation: As per the reference, yellow light is absorbed by [Ti(H2O)6]3+. Thus, option A is correct.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: Cobalt is not used as a catalyst for catalytic oxidation of methane. Thus option C is correct, as the catalyst is mismatched with the…

• A. Cr
• B. Cu
• C. Zn
• D. Fe

Explanation: Highest oxidation state of Cr is +6. Thus, among the given options Cr is the correct answer.

• A. Zn+2
• B. Sc+3
• C. Mn+2
• D. Cr+3

Explanation: C) Mn2+: The manganese ion (Mn2+) has five unpaired electrons in the 3d sub-shell.

• A. Oxidation number
• B. Coordination number
• C. Effective atomic number
• D. Coordination complex

Explanation: The number of lone pair of electrons provided by the ligands to the central metal atom or ion is called the coordination number of the…