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2021 14 questions

Q652021 · 1 Sept 2021 · Shift 2
The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion ( $M^{z +}$ ) are $- 0.8 Δ_{0}$ and $3.87 BM$ , respectively. Identify ( $M^{z +}$ ) :
1. A. $V^{3 +}$
2. B. $C r^{3 +}$
3. C. $M n^{4 +}$
4. D. $C o^{2 +}$
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Answer: D
Q662021 · 26 Aug 2021 · Shift 2
Indicate the complex/complex ion which did not show any geometrical isomerism :
1. A. $[CoC l_{2} (en)_{2}]$
2. B. $[Co (CN)_{5} (NC)]^{3 -}$
3. C. $[Co (N H_{3})_{3} (N O_{2})_{3}]$
4. D. $[Co (N H_{3})_{4} C l_{2}]^{+}$
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Answer: B
Q672021 · 26 Aug 2021 · Shift 2
Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value. Complexes : $A [Co F_{6}]^{3 -}$ , $B [Co (H_{2} O)_{6}]^{2 +}$ , $C [Co (N H_{3})_{6}]^{3 +}$ and $D [Co (en)_{3}]^{3 +}$ Choose the correct option :
1. A. $A < B < C < D$
2. B. $B < A < C < D$
3. C. $B < C < D < A$
4. D. $C < D < B < A$
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Answer: B
Q872021 · 26 Aug 2021 · Shift 2· Numerical answer
The overall stability constant of the complex ion $[Cu (N H_{3})_{4}]^{2 +}$ is $2.1 \times 1 0^{13}$ . The overall dissociations constant is $y \times 1 0^{- 14}$ . Then y is ___________. (Nearest integer)
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Answer: 5
Q622021 · 25 Jul 2021 · Shift 2
Which one of the following metal complexes is most stable?
1. A. $[Co (en) (N H_{3})_{4}] C l_{2}$
2. B. $[Co (en)_{3}] C l_{2}$
3. C. $[Co (en)_{2} (N H_{3})_{2}] C l_{2}$
4. D. $[Co (N H_{3})_{6}] C l_{2}$
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Answer: B
Q812021 · 22 Jul 2021 · Shift 2· Numerical answer
The total number of unpaired electrons present in $[Co (N H_{3})_{6}] C l_{2}$ and $[Co (N H_{3})_{6}] C l_{3}$ is :
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Answer: 3
Q842021 · 20 Jul 2021 · Shift 1· Numerical answer
The spin-only magnetic moment value for the complex $[Co (CN)_{6}]^{4 -}$ is ________ BM (nearest integer). [At. no. of $Co = 27$ ]
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Answer: 2
Q702021 · 18 Mar 2021 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q872021 · 18 Mar 2021 · Shift 1· Numerical answer
The total number of unpaired electrons present in the complex $K_{3} [Cr (oxalate)_{3}]$ is ____.
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Answer: 3
Q812021 · 16 Mar 2021 · Shift 1· Numerical answer
The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of $CoC l_{3} \cdot 4N H_{3}$ is _______. (Round off to the Nearest Integer).
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Answer: 2
Q842021 · 26 Feb 2021 · Shift 1· Numerical answer
Number of bridging CO ligands in $[M n_{2} (CO)_{10}]$ is _________.
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Answer: 0
Q872021 · 26 Feb 2021 · Shift 2· Numerical answer
The number of stereoisomers possible for $[Co (ox)_{2} (Br) (N H_{3})]^{2 -}$ is _________. [ $ox = oxalate$ ]
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Answer: 3
Q652021 · 25 Feb 2021 · Shift 2
In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment? (i) $[Fe F_{6}]^{3 -}$ (ii) $[Co (N H_{3})_{6}]^{3 +}$ (iii) $[NiC l_{4}]^{2 -}$ (iv) $[Cu (N H_{3})_{4}]^{2 +}$
1. A.(iii) > (iv) > (ii) > (i)
2. B.(ii) > (iii) > (i) > (iv)
3. C.(i) > (iii) > (iv) > (ii)
4. D.(ii) > (i) > (iii) > (iv)
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Answer: C
Q692021 · 25 Feb 2021 · Shift 2
Given below are two statements : Statement I : The identification of $N i^{2 +}$ is carried out by dimethyl glyoxime in the presence of $N H_{4} OH$ . Statement II : The dimethyl glyoxime is a bidentate neutral ligand. In the light of the above statements, choose the correct answer from the options given below :
1. A.Statement I is false but Statement II is true.
2. B.Statement I is true but Statement II is false.
3. C.Both Statement I and Statement II are false.
4. D.Both Statement I and Statement II are true.
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Answer: D