3884.A solution containing 2.675 g of CoCl3 · 6NH3 (molar mass = 267.5 g mol–1) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of AgNO3 to give 4.78 g of AgCl (molar mass = 143.5 g mol–1). The formula of the complex is
(At. Mass of Ag = 108 u)
(At. Mass of Ag = 108 u)
[Co(NH3)6]Cl3
[CoCl2(NH3)4]Cl
[CoCl3(NH3)3]
[CoCl(NH3)5]Cl2
3885.Excess of silver nitrate solution is added to 100 ml of 0.01 M Pentaaqua chloro chromium (III) chloride solution. The mass of silver chloride obtained in grams is
[Atomic mass of silver is 108].
[Atomic mass of silver is 108].
287 × 10–3
143.5 × 10–3
143.5 × 10–2
287 × 10–2
3886.Geometrical shapes of the complexes formed by the reaction of Ni2+ with Cl–, CN– and H2O, respectively are
Octahedral, tetrahedral and square planar
Tetrahedral, square planar and octahedral
Square planar, tetrahedral and octahedral
Octahedral, square planar and octahedral
3887.Nickel (Z = 28) combines with a uninegative monodentate ligand X– to form a paramagnetic complex [NiX4]2–. The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively
one, tetrahedral
two, tetrahedral
one, square planar
two, square planar
3888.The correct statement with respect to the complexes Ni(CO)4 and [Ni(CN)4]2– is
nickel is in the same oxidation state in both
both have tetrahedral geometry
both have square planar geometry
have tetrahedral and square planar geometry respectively
3889.The pair of compounds having metals in their highest oxidation state is
MnO2, FeCl3
[MnO4]–, CrO2Cl2
[Fe(CN)6]3–, [Co(CN)3]
[NiCl4]2–, [CoCl4]–
3890.The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is
d4 (in strong ligand filed)
d4 (in weak ligand field)
d3 (in weak as well as in strong fields)
d5 (in strong ligand field)
3891.When EDTA solution is added to Mg2+ ion solution, then which of the following statements is not true?
four coordinate sites of Mg2+ are occupied by EDTA and remaining two sites are occupied by water molecules
All six coordinate sites of Mg2+ are occupied
pH of the solution is decreased
Colorless [Mg–EDTA]2– chelate is formed
3892.Which of the following facts about the complex [Cr(NH3)6]Cl3 is wrong?
The complex gives white precipitate with silver nitrate solution
The complex involves d2sp3 hybridization and is octahedral in shape
The complex is paramagnetic
The complex is an outer orbital complex
3893.Which of the following pairs represents linkage isomers?
[Pd(P Ph3)2 (NCS)2] and [Pd(P Ph3)2(SCN)2]
[Co (NH3)5 NO3]SO4 and [Co(NH3)5SO4] NO3
[Pt Cl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2
[Cu(NH3)4] [PtCl4] and [Pt(NH3)4] [CuCl4]
3894.Which of the following statements is incorrect?
In K4 [Fe(CN)6], the ligand has satisfied both primary and secondary valencies of ferrous ion.
In [Cu(NH3)4]SO4, the ligand has satisfied only the secondary valency of copper.
In K3[Fe(CN)6] , the ligand has satisfied only the secondary valency of ferric ion.
In K3[Fe(CN)6], the ligand has satisfied both primary and secondary valencies of ferric ion
3895.A solution containing 2.675 g of CoCl3 · 6NH3 (molar mass = 267.5 g mol–1) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of AgNO3 to give 4.78 g of AgCl (molar mass = 143.5 g mol–1). The formula of the complex is
(At. Mass of Ag = 108 u)
(At. Mass of Ag = 108 u)
[Co(NH3)6]Cl3
[CoCl2(NH3)4]Cl
[CoCl3(NH3)3]
[CoCl(NH3)5]Cl2
3896.Consider the reaction :
4NO2(g) + O2(g) ® 2N2O5(g), ΔrH = –111kJ.
If N2O5(s) is formed instead of N2O5(g) in the above reaction, the ΔrH value will be:
(given, ΔH of sublimation for N2O5 is 54 kJ mol–1)
4NO2(g) + O2(g) ® 2N2O5(g), ΔrH = –111kJ.
If N2O5(s) is formed instead of N2O5(g) in the above reaction, the ΔrH value will be:
(given, ΔH of sublimation for N2O5 is 54 kJ mol–1)
–219 kJ
–165 kJ
+ 54 kJ
+ 219 kJ
3897.The standard enthalpy of formation of NH3 is –46.0 kJ mol–1. If the enthalpy of formation of H2 from its atoms is –436 kJ mol–1 and that of N2 is –712 kJ mol–1, the average bond enthalpy of N — H bond is NH3 is
–1102 kJ mol–1
–964 kJ mol–1
+352 kJ mol–1
+1056 kJ mol–1
3898.An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct?
(Tf)irrev > (Tf)rev
Tf > Ti for reversible process but Tf = Ti for irreversible process
(Tf)rev = (Tf)irrev
Tf = Ti for both reversible and irreversible processes
3899.The standard enthalpy of formation (ΔfH°) at 298 K for methane, CH4(g), is –74.8 kJ mol–1. The additional information required to determine the average energy for C – H bond formation would be
the dissociation energy of H2 and enthalpy of sublimation of carbon
latent heat of vaporization of methane
the first four ionization energies of carbon and electron gain enthalpy of hydrogen
the dissociation energy of hydrogen molecule, H2