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Chemistry 1 Marks Question

Coordination Compounds · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 17 questions.

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Question 11 Mark
Define coordinate polyhedron.
Answer
In a coordination complex, the space arrangement of the central atom/ligand atoms directly attached to each other is called coordination polyhedron.
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Question 21 Mark
What type of isomerism is shown by $\left[ Co \left( NH _3\right)_6\right]$ $\left[ Cr ( CN )_6\right]$ and $\left[ Cr \left( NH _3\right)_6\right]\left[ Co ( CN )_6\right]$ ?
Answer
Coordination isomerism.
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Question 31 Mark
Write the IUPAC name of $K _3\left[ Al \left( C _2 O _4\right)_3\right]$.
Answer
Potassium trioxalato aluminate (III).
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Question 41 Mark
Which are the strong field ligands among $I ^{-}, S ^{2-}, H _2 O , NCS ^{-}$and CO ?
Answer
$NCS ^{-}$and CO are strong field ligands.
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Question 51 Mark
What is pairing energy?
Answer
The energy required for pairing of two electrons in an orbital is called pairing energy.
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Question 61 Mark
Why is $\left[ Cu ( CN )_4\right]^{2-}$ complex ion is more stable than the $\left[ Cu \left( NH _3\right)_4\right]^{2+}$ complex ion?
Answer
$CN ^{-}$is a stronger ligand than $NH _3$, hence, $\left[ Cu ( CN )_4\right]^{2-}$ is more stable than $\left[ Cu \left( NH _3\right)_4\right]^{2+}$.
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Question 71 Mark
Name the ligand required for determining the hardness of water.
Answer
The hardness of water is determined by EDTA (ethylene diamine tetra acetate).
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Question 81 Mark
Which hybridisation occurs on Fe in $\left[ Fe ( CO )_5\right]$ and also write its magnetic properties.
Answer
In $\left[ Fe ( CO )_5\right]$ dsp ${ }^3$ hybridization occurs on Fe and it is diamagnetic.
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Question 91 Mark
How many geometric isomers of [MABXY] type complex are possible?
Answer
Three (two in cis and one in trans).
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Question 101 Mark
Which type of square planar complex is geometric? Does it show compatibility?
Answer
$\left[ MX _2 L_2\right],\left[ ML _2 X _4\right]\left[ M ( AB )_2\right]$ type of square planar complexes show geometric homogeneity.
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Question 111 Mark
Give the IUPAC name of the complex $\left[ Fe \left( C _2 H _5\right)_2\right]$.
Answer
Bis(cyclopenta dienyl) iron (ii).
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Question 121 Mark
How can (i) $\left[ Pt \left( NH _3\right)_4 Cl _2\right] Br _2$ and (ii) $\left[ Pt \left( NH _3\right)_4 Br _2\right] Cl _2$ be differentiated?
Answer
On adding $AgNO _3$ in hydrolysed solution of both the complexes, yellow precipitate of AgBr will be formed in (i) while in (ii) white precipitate of AgCl will be obtained.
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Question 131 Mark
Write the ascending order of movement of aqueous solution of the following complexes :
(i) $K _4\left[ Fe ( CN )_6\right]$
(ii) $\left[ Pt \left( NH _3\right)_4\right]\left[ PtCl _4\right]$
(iii) $\left[ Ni ( CO )_4\right]$
Answer
(iii) < (ii) < (i) Because there is no substance in the solution of (iii). There are no ions but the aqueous solutions of (ii) and (i) will have 2 and 5 atoms respectively.
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Question 141 Mark
What is the harmony number of Cr in $[ Cr ( EDTA )]^{-1}$ ?
Answer
The coordination number of Cr in this complex is 6.
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Question 161 Mark
What is the effective atomic number of Ni in $\left[ NiCl _4\right]^{2-?}$ ?
Answer
Effective atomic number of Ni in $\left[ NiCl _4\right]^{2-}$ is $26+$ $8=34$.
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