1 Marks Question

Question 11 Mark

Using IUPAC norms write the formulae for the following:
Hexaamminecobalt (III) sulphate

Answer

Hexaamminecobalt(III) sulphate $\left[ Co \left( NH _3\right)_6\right]_2\left( SO _4\right)_3$

Question 21 Mark

Define double salts with suitable examples.

Answer

They usually contain two simple salts in equimolar proportions. A double salt dissociate completely into ions in aqueous solution.
$K _2 SO _4 . Cr _2\left( SO _4\right)_3 .24 H _2 O \longrightarrow 2 K^{+}+2 Cr ^{3+}$$+4 SO _4^{2-}+24 H _2 O$

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Question 31 Mark

Write the IUPAC name of the compound $K _3\left[ Cr _2\left( C _2 O _4\right)_3\right]$.

Answer

Potassium Trioxalatochromate (III)

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Question 41 Mark

Why $NH_{3}$ is a good ligand?

Answer

Ammonia acts a good ligand due to the lone pair of electrons on nitrogen. It can early forms coordinate bonds with the lone pair.

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Question 51 Mark

Give the formula for tetra-amino aqua chloride cobalt (III) chloride.

Answer

$[Co (NH_{3})_{4} (H_{2}O)Cl]Cl_{2}$

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Question 61 Mark

Write the co-ordination number and oxidation state of Platinum in the complex $[Pt(en)_{2}Cl_{2}]$.

Answer

(i) Oxidation State: +2
(ii) Co-ordination Number: 6

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Question 71 Mark

Write two major limitations of the valence bond theory.

Answer

Limitations of valence bond theory : (i) It does not explain electronic spectra of transition metal complexes. (ii) It does not provide complete explanation of relative stability of transition metal complexes with different type of ligands.

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Question 81 Mark

$[Fe(CN)_{6}]^{3-}$ is weakly paramagnetic while $[Fe(CN)_{6}]^{4-}$ is diamagnetic. Why?

Answer

In $[ Fe ( CN ) 6]^{3-}$, Fe(III) has one unpaired electron, whereas in $\left[ Fe ( CN )_6\right]^{4-}$, Fe(II) has no unpaired electron.

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Question 91 Mark

Write the all geometrical isomers of $[Pt(NH_{3})(Br)(Cl)py]$ and among them how many show optical isomerism?

Answer

Following three isomers are possible:
Isomers of this type do not show optical isomerism. Optical isomerism rarely occurs in square planer or tetrahedral complexes, while they contain chelating legands.

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Question 101 Mark

Which of the two compounds is more stable and why? $K_{4}[Fe(CN)_{6}], K_{3}[Fe(CN)_{6}]$

Answer

$K _3\left[ Fe ( CN )_6\right]$ is more stable because in this compound Fe is in oxidation state III while in the first compound Fe is in oxidation state II which can be oxidized to oxidation state III.

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Chemistry 1 Marks Question

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