Question 11 Mark
Define coordinate polyhedron.
AnswerIn 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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What type of isomerism is shown by $\left[ Co \left( NH _3\right)_6\right]$ $\left[ Cr ( CN )_6\right]$ and $\left[ Cr \left( NH _3\right)_6\right]\left[ Co ( CN )_6\right]$ ?
View full question & answer→Question 31 Mark
Write the IUPAC name of $K _3\left[ Al \left( C _2 O _4\right)_3\right]$.
AnswerPotassium trioxalato aluminate (III).
View full question & answer→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.
View full question & answer→Question 51 Mark
AnswerThe energy required for pairing of two electrons in an orbital is called pairing energy.
View full question & answer→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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Name the ligand required for determining the hardness of water.
AnswerThe hardness of water is determined by EDTA (ethylene diamine tetra acetate).
View full question & answer→Question 81 Mark
Which hybridisation occurs on Fe in $\left[ Fe ( CO )_5\right]$ and also write its magnetic properties.
AnswerIn $\left[ Fe ( CO )_5\right]$ dsp ${ }^3$ hybridization occurs on Fe and it is diamagnetic.
View full question & answer→Question 91 Mark
How many geometric isomers of [MABXY] type complex are possible?
AnswerThree (two in cis and one in trans).
View full question & answer→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.
View full question & answer→Question 111 Mark
Give the IUPAC name of the complex $\left[ Fe \left( C _2 H _5\right)_2\right]$.
AnswerBis(cyclopenta dienyl) iron (ii).
View full question & answer→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?
AnswerOn 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.
View full question & answer→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.
View full question & answer→Question 141 Mark
What is the harmony number of Cr in $[ Cr ( EDTA )]^{-1}$ ?
AnswerThe coordination number of Cr in this complex is 6.
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Write the formula of carnallite.
AnswerThe formula of carnallite is $KCl . MgCl _2 \cdot 6 H _2 O$.
View full question & answer→Question 161 Mark
What is the effective atomic number of Ni in $\left[ NiCl _4\right]^{2-?}$ ?
AnswerEffective atomic number of Ni in $\left[ NiCl _4\right]^{2-}$ is $26+$ $8=34$.
View full question & answer→Question 171 Mark
Give the IUPAC name of $\overline{ N } H _2$ ligand.
Answer$\overline{ N } H _2$, name is Amido.
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Using IUPAC norms, write the systematic name of :
$\left[ Co ( en )_3\right]^{3+}$
AnswerTris(ethane-1, 2-diammine) cobalt(III) ion
View full question & answer→Question 191 Mark
Using IUPAC norms, write the systematic name of :
$\left[ Ni \left( NH _3\right)_6\right] Cl _2$
AnswerHexaamminenickel(II) chloride
View full question & answer→Question 201 Mark
Using IUPAC norms, write the systematic name of :
$\left[ NiCl _4\right]^{2-}$
AnswerTetrachloridonickelare(II) ion
View full question & answer→Question 211 Mark
Using IUPAC norms, write the systematic name of :
$\left[ Mn \left( H _2 O \right)_6\right]^{2+}$
View full question & answer→Question 221 Mark
Using IUPAC norms, write the systematic name of :
$\left[ Ni ( CO )_4\right]$
View full question & answer→Question 231 Mark
Using IUPAC norms, write the systematic name of :
$\left[ Co \left( NH _3\right)_4 Cl \left( NO _2\right)\right] Cl$
AnswerTetraamminichloridonitrito-N-Cobalt(III) chloride
View full question & answer→Question 241 Mark
Using IUPAC norms, write the systematic name of :
$\left[ Ti \left( H _2 O \right)_6\right]^{3+}$
View full question & answer→Question 251 Mark
Using IUPAC norms, write the systematic name of :
$\left[ Pt \left( NH _3\right)_2 Cl \left( NH _2 CH _3\right)\right] Cl$
AnswerDiamminechlorido(methylamine) platinum(II) chloride
View full question & answer→Question 261 Mark
Using IUPAC norms, write the systematic name of :
$\left[ Co \left( NH _3\right)_6\right] Cl _3$
AnswerHexaamminecobalt (III) chloride
View full question & answer→Question 271 Mark
Using IUPAC norms, write the formula for :
Pentaamminenitrito-N-cobalt(III)
Answer$\left[ Co \left( NH _3\right)_5\left( NO _2\right)\right]^{2+}$
View full question & answer→Question 281 Mark
Using IUPAC norms, write the formula for :
Hexaammineplatinum(IV)
Answer$\left[ Pt \left( NH _3\right)_6\right]^{4+}$
View full question & answer→Question 291 Mark
Using IUPAC norms, write the formula for :
Potassium tri(oxalato) chromate(III)
Answer$K _3\left[ Cr \left( C _2 O _4\right)_3\right]$
View full question & answer→Question 301 Mark
Using IUPAC norms, write the formula for :
Hexaamminecobalt(III) sulphate
Answer$\left[ Co \left( NH _3\right)_6\right]_2\left( SO _4\right)_3$
View full question & answer→Question 311 Mark
Using IUPAC norms, write the formula for :
Pentaamminenitrito-O-cobalt(III)
Answer$\left[ Co \left( NH _3\right)_5( ONO )\right]^{2+}$
View full question & answer→Question 321 Mark
Using IUPAC norms, write the formula for :
Tetrabromidocuprate(II)
Answer$\left[ CuBr _4\right]^{2-}$
View full question & answer→Question 331 Mark
Using IUPAC norms, write the formula for :
Potassium tetracyanonickelate(II)
Answer$K _2\left[ Ni ( CN )_4\right]$
View full question & answer→Question 341 Mark
Using IUPAC norms, write the formula for :
Diamminedichloridoplatinum(II)
Answer$\left[ Pt \left( NH _3\right)_2 Cl _2\right]$
View full question & answer→Question 351 Mark
Using IUPAC norms, write the formula for :
Potassium tetrachloridopalladate(II)
Answer$K _2\left[ PdCl _4\right]$
View full question & answer→Question 361 Mark
Using IUPAC norms, write the formula for :
Tetrahydroxozincate(II)
Answer$\left[ Zn ( OH )_4\right]^{2-}$
View full question & answer→Question 371 Mark
Specify the oxidation numbers of the metal in the coordination entities :
$\left[ Cr \left( NH _3\right)_3 Cl _3\right]$
Answer$\left[ Cr \left( NH _3\right)_3 Cl _3\right]$
x + 0 - 3 = 0
x = +3 hence, oxidation number of Cr = +3
View full question & answer→Question 381 Mark
Specify the oxidation numbers of the metal in the coordination entities :
$K _3\left[ Fe ( CN )_6\right]$
Answer$K _3\left[ Fe ( CN )_6\right]$
3 + x - 6 = 0
x = +3 hence, oxidation number of Fe = +3
View full question & answer→Question 391 Mark
Specify the oxidation numbers of the metal in the coordination entities :
$\left[ PtCl _4\right]^{2-}$
Answer$\left[ PtCl _4\right]^{2-}$
x - 4 = - 2
x = +2 hence, oxidation number of Pt = +3
View full question & answer→Question 401 Mark
Specify the oxidation numbers of the metal in the coordination entities :
$\left[ CoBr _2( en )_2\right]^{+}$
Answer$\left.\left[ CoBr _2 \text { (en }\right)_2\right]^{+}$
x - 2 + 0 = +1
x = +3 hence, oxidation number Co = +2
View full question & answer→Question 411 Mark
Specify the oxidation numbers of the metal in the coordination entities :
$\left[ Co \left( H _2 O \right)( CN )( en )_2\right]^{2+}$
Answer[Co(H2O)(CN)(en)2]2+
$
x+0+(-1)+0=+2
$
$x =+3$ hence, oxidation number of $Co =+3$
View full question & answer→Question 421 Mark
Amongst the following ions which one has the highest mangetic moment value?
(i) $\left[ Cr \left( H _2 O \right)_6\right]^{3+}$
(ii) $\left[ Fe \left( H _2 O \right)_6\right]^{2+}$
(iii) $\left[ Zn \left( H _2 O \right)_6\right]^2$
AnswerIn these complex ions, the number of unpaired electrons in Zn+2, Cr+3 and Fe2+ is 0, 3 and 4 respectively. Therefore, the magnetic moment of the complex ion $\left[ Fe \left( H _2 O \right)_6\right]^{2+}$ will be the highest.
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