Formation of Complexes

Q.

Write the formulae for the following compounds:

Mercury(II) chloride

Nickel(II) sulphate

Tin(IV) oxide

Thallium(I) sulphate

Iron(III) sulphate

Chromium(III) oxide

Q. In the complex ion [Fe(EDTA)]^- the coordination number and oxidation state of central metal ion is :- (1) C.N = 6, O.N = +3 (2) C.N = 1, O.N = -1 (3) C.N = 4, O.N = +2 (4) C.N = 3, O.N = +3

Q. Write the major product of the following reaction.
$C{H}_3-Cl+KCN\to ?$

1. Methylcyanide
2. Methylisocyanide
3. Ethane
4. None of the above

Q. What are the products formed in sequence when excess of $C{O}_2$ is passed in slaked lime?

1. $CaO$, $CaC{O}_3$
2. $CaC{O}_3$, $Ca(HC{O}_3{)}_2$
3. $Ca(HC{O}_3{)}_2$, $CaC{O}_3$
4. $CaO$, $Ca(HC{O}_3{)}_2$

Q. Which reagent is used for detecting ${\text{Ni}}^{2+}$ ions in solution?

1. EDTA
2. Dimethylglyoxime
3. $\alpha -\text{nitroso}-\beta -\text{naphthol}$
4. None of the above

Q.

What is a super octet molecule ? Give examples with its lewis structure

Q. The coordination number of $Th$ in $K_4\left[Th\right(C_2{O}_4{)}_4\left(O{H}_2{)}_2\right]$ is:
$C_2{O}_4^{2-}=\text{oxalato}$

1. $14$
2. $10$
3. $8$
4. $6$

Q. Ammonium dichromate is used in fireworks. The green coloured powder blown in air is

1. $C{r}_2{O}_3$
2. $Cr$
3. $Cr{O}_3$
4. $CrO(O{)}_2$

Q. Choose the correct product in the given reaction?
$8LiH+A{l}_{2}C{l}_6\to$

1. Li
2. $H_2$
3. $LiAl{H}_4$
4. None of the above

Q. Which of the carbonates given below is unstable in air and is kept in the $C{O}_2$ atmosphere to avoid decomposition.

1. $CaC{O}_3$
2. $BaC{O}_3$
3. $BeC{O}_3$
4. $MgC{O}_3$

Q.

List two non-metal used in crackers.

Q. Boric acid $\left(H_{3}B{O}_3\right)$ has:

1. Trigonal structure
2. Tetrahedral structure
3. Layer structure in which $B{O}_3$ units are linked by oxygen
4. Layer structure in which planar $B{O}_3$ units are linked by hydrogen bonding

Q. One of the following metals forms a volatile carbonyl compound and this property is taken advantage of for its extraction. This metal is

1. Iron
2. Nickel
3. Cobalt
4. Tungsten

Q. In which of the following molecule central atom is having complete octet (1) BeCl2(dimer) (2) BeH2(dimer) (3) BeH2(s) (4) BeCl2(s)

Q. Considering $H_{2}O$ as weak field ligand, the number of unpaired electrons in $\left[Mn\right(H_{2}O{)}_6{]}^{2+}$ will be:
(Atomic number of Mn=25):

1. three
2. five
3. two
4. four

Q.

What makes a good ligand?

Q. The coinage metals are

1. Gold, Platinum
2. Copper and Zinc
3. Iron, Cobalt, Nickel
4. Copper, Silver, Gold

Q. Which of the following oxides is acidic in nature?

1. $I{n}_2{O}_3$
2. $B_2{O}_3$
3. $A{l}_2{O}_3$
4. $G{a}_2{O}_3$

Q. Complexes in which ligand substitution occurs fast are called

1. labile complexes
2. facile complexes
3. volatile complexes
4. None of the above

Q. When excess of $N{a}_2{S}_2{O}_3$ is added to dil.$AgN{O}_3$, a soluble compound ‘X’ is formed. However, when dil. $N{a}_2{S}_2{O}_3$ is added to conc. $AgN{O}_3$ solution, a white precipitate turns yellow and finally black. Precipitate ‘Y’ is formed here. Which is the correct pair?

1. ‘X’ is $A{g}_{2}S$ and ‘Y’ is $N{a}_3\left[Ag\right(S_2{O}_3{)}_2]$
2. ‘X’ is $N{a}_3\left[Ag\right(S_2{O}_3{)}_2]$ and ‘Y’ is $A{g}_{2}S$
3. ‘X’ is $A{g}_2{S}_2{O}_3$ and ‘Y’ is $A{g}_{2}S$
4. ‘X’ is $A{g}_2{S}_2{O}_3$ and ‘Y’ is $N{a}_3\left[Ag\right(S_2{O}_3{)}_2]$

Q. The correct labeling of different terms used in coordination compounds is:

1. (i) Central atoms, (ii) Ionisation sphere, (iii) Coordination number, (iv) Ligands
2. (i) Ligands, (ii) Coordination number, (iii) Valency, (iv) Ionic sphere
3. (i) Ionisation sphere, (ii) Ligands, (iii) Coordination number, (iv) Central atom
4. (i) Ligands, (ii) Ionisation sphere, (iii) Coordination number, (iv) Central atom

Q. IPUAC name of the complex ion $\left[CrC{l}_2\right(ox{)}_2{]}^{3–}$ is

1. Bisoxalatodichlorochromate (III)
2. Dioxalatodichlorochromate (III)
3. Dichlorodioxalatochromate (III)
4. Dichlorodioxalatochromium (III)

Q. Which of the following statement is correct regarding coordination complex?

1. Complex compound cannot act as counter ion
2. Ligand donates electrons to central metal ion
3. Central metal ion donate electrons from ligands
4. In $K_4\left[Fe\right(CN{)}_6]$, the ionisation sphere is $\left[Fe\right(CN{)}_6{]}^{4-}$

Q. Which of the following ore is concentrated using group 1 cyanide salt ?

1. Calamine
2. Siderite
3. Malachite
4. Sphalerite

Q. An alcoholic solution of dimethylglyoxime is added to an aqueous solution of nickel(II) chloride. Slow addition of ammonium hydroxide led to the precipitation of a bright-red coloured metal complex. The number of hydrogen bonds present in the structure of the complex are:

1. 6
2. 0
3. 2
4. 4

Q. The mass of gold in an 18 carat gold ring of 4g is

1. 4g
2. 3g
3. 2g
4. 1g

Q. How to know if a molecule is homonuclear diatomic molecule?

Q. The tendency towards complex formation is maximum in

1. s-block elements
2. p-block elements
3. d-block elements
4. f-block elements

Q. Which of the following metal is present in misch metal

1. La
2. Sc
3. Ni
4. Cr

Q. The d-orbitals, which are stabilized in an octahedral magnetic field are

1. $d_{xy}\text{and}{d}_z^2$
   
2. $d{x}^2-y_2\text{and}{d}_z^2$
3. $d_{xy},d_{xz}\text{and}{d}_{yz}$
4. $d_x^2$ only