Fe(CO)5 contains one iron atom complexed with five carbonyl ligands, so it is mononuclear.
Q137mcq
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code:
a.
iii v i ii
b.
iv i ii iii
Correct Answer
c.
i ii iii iv
d.
iv v ii i
Step-by-Step AI Explanation
Verified Method
Using spin-only magnetic moments: Co3+ is d6 and usually low spin, so 1 unpaired? In the given list the matching intended by the options is Co3+ → 4.9? OCR is distorted. Standard matching by unpaired electrons gives Cr3+ (d3) = 3.87 BM, Fe3+ (d5) = 5.92 BM, Ni2+ (d8) = 2.83 BM. The option set appears OCR-corrupted; the intended answer corresponds to iv i ii iii.
Q138mcq
Which one of the following ions exhibits d-d transition and paramagnetism as well?
a.
MnO4^2−
Correct Answer
b.
MnO4−
c.
CrO7^2−
d.
CrO4^2−
Step-by-Step AI Explanation
Verified Method
MnO4^2− has Mn in +6 oxidation state (d1), so it is paramagnetic and can show d-d transitions. MnO4− is d0 and diamagnetic; chromate/dichromate ions have d0 metal centers and are diamagnetic.
Q139mcq
The geometry and magnetic behaviour of the complex [Ni(CO)4] are
a.
tetrahedral geometry and paramagnetic
b.
square planar geometry and paramagnetic
c.
tetrahedral geometry and diamagnetic
Correct Answer
d.
square planar geometry and diamagnetic
Step-by-Step AI Explanation
Verified Method
[Ni(CO)4] has Ni in oxidation state 0 with effectively d10 configuration; all electrons are paired and the complex is tetrahedral.
Q140mcq
The type of isomerism shown by the complex [CoCl2(en)2] is
a.
Linkage isomerism
b.
Ionization isomerism
c.
Coordination isomerism
d.
Geometrical isomerism
Correct Answer
Step-by-Step AI Explanation
Verified Method
An octahedral complex of the type [M(en)2Cl2] can exist as cis and trans forms, so it shows geometrical isomerism.
Q142mcq
Which of the following compounds can form a zwitterion?
a.
Glycine
Correct Answer
b.
Benzoic acid
c.
Acetanilide
d.
Aniline
Step-by-Step AI Explanation
Verified Method
Glycine contains both -NH2 and -COOH groups, so it can exist as a zwitterion with internal salt formation. The others do not readily form zwitterions.
Q142mcq
Which of the following compounds can form a zwitterion?
a.
Glycine
Correct Answer
b.
Benzoic acid
c.
Acetanilide
d.
Aniline
Step-by-Step AI Explanation
Verified Method
Glycine contains both acidic carboxyl and basic amino groups, so it can exist as a zwitterion.
Q143mcq
For the redox reaction MnO4^- + C2O4^2- + H+ → Mn2+ + CO2 + H2O, the correct coefficients of the reactants for the balanced equation are:
a.
5 16 2
Correct Answer
b.
2 16 5
c.
2 5 16
d.
16 5 2
Step-by-Step AI Explanation
Verified Method
In acidic medium, the balanced equation is 2MnO4^- + 5C2O4^2- + 16H+ → 2Mn2+ + 10CO2 + 8H2O. Hence the reactant coefficients are 2, 5 and 16 in the order MnO4^-, C2O4^2-, H+.
Q143mcq
For the redox reaction MnO4− + C2O4^2− + H+ → Mn2+ + CO2 + H2O, the correct coefficients of the reactants for the balanced equation are
a.
5 16 2
Correct Answer
b.
2 16 5
c.
2 5 16
d.
16 5 2
Step-by-Step AI Explanation
Verified Method
The balanced equation is 2 MnO4− + 5 C2O4^2− + 16 H+ → 2 Mn2+ + 10 CO2 + 8 H2O. Thus the reactant coefficients MnO4− : C2O4^2− : H+ are 2 : 5 : 16.
Q144mcq
The correction factor ‘a’ to the ideal gas equation corresponds to
a.
forces of attraction between the gas molecules
Correct Answer
b.
electric field present between the gas molecules
c.
volume of the gas molecules
d.
density of the gas molecules
Step-by-Step AI Explanation
Verified Method
In the van der Waals equation, a corrects for intermolecular attractive forces, while b corrects for molecular volume.
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The bond dissociation energies of X2, Y2 and XY are in the ratio 1 : 0.5 : 1. ΔH for the formation of XY is -200 kJ mol^-1. The bond dissociation energy of X2 will be
a.
400 kJ mol^-1
b.
800 kJ mol^-1
c.
100 kJ mol^-1
d.
200 kJ mol^-1
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The bond dissociation energies of X2, Y2 and XY are in the ratio of 1 : 0.5 : 1. ΔH for the formation of XY is −200 kJ mol−1. The bond dissociation energy of X2 will be
a.
400 kJ mol−1
b.
800 kJ mol−1
c.
100 kJ mol−1
d.
200 kJ mol−1
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The correct difference between first- and second-order reactions is that
a.
the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
b.
a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed
c.
the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0
d.
the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
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Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is
a.
CH4
b.
CH3 - CH3
c.
CH2 = CH2
d.
CH ≡ CH
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A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with concentrated H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be:
a.
4.4
b.
2.8
c.
3.0
d.
1.4
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A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
a.
4.4
b.
2.8
c.
3.0
d.
1.4
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Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations:
a. 60 mL 10 M HCl + 40 mL 10 M NaOH
b. 55 mL 10 M HCl + 45 mL 10 M NaOH
c. 75 mL 5 M HCl + 25 mL 5 M NaOH
d. 100 mL 10 M HCl + 100 mL 10 M NaOH
pH of which one of them will be equal to 1?
a.
c
b.
d
c.
a
d.
b
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The solubility of BaSO4 in water is 2.42 × 10−3 g L−1 at 298 K. The value of its solubility product (Ksp) will be (Given molar mass of BaSO4 = 233 g mol−1)
a.
1.08 × 10−8 mol2 L−2
b.
1.08 × 10−14 mol2 L−2
c.
1.08 × 10−12 mol2 L−2
d.
1.08 × 10−10 mol2 L−2
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Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is:
a.
Mg3X2
b.
Mg2X
c.
MgX2
d.
Mg2X3
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Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively
a.
C6H5CH(OH)CH3 and I2
b.
C6H5CH2CH2OH and I2
c.
C6H5COCH3 and Cl2
d.
C6H5CH(OH)CH3 and Br2
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