Introduction to Optical Isomerism

Q.

What is formula unit?

Q.

The number of stereoisomers possible for ${\left[\mathrm{Co}{\left(\mathrm{ox}\right)}_2\left(\mathrm{Br}\right)\left({\mathrm{NH}}_3\right)\right]}^{-2}$ is

Q. Which of the following is expected to exhibit optical isomerism? (en= ethylenediamine)

1. $\text{cis}-\left[Pt{\left(N{H}_3\right)}_{2}C{l}_2\right]$
2. $\text{trans}-\left[Co{\left(en\right)}_{2}C{l}_2\right]$
3. $\text{trans}-\left[Pt{\left(N{H}_3\right)}_{2}C{l}_2\right]$
4. $\text{cis}-\left[Co{\left(en\right)}_{2}C{l}_2\right]$

Q. The Azimuthal quantum number for the valence electrons of $G{a}^{+}$ ion is . (Atomic number of Ga = 31)

Q. Which of the following is correct regarding diastereomers?

1. Diastereomers have same physical properties
2. Diastereomers have same chemical properties
3. Diastereomers cannot be separated easily
4. None of the above

Q. Which of the following will give a pair of enantiomers?

1. $\left[Cr\right(N{H}_3{)}_6\left]\right[Co\left(CN{)}_6\right]$
2. $\left[Co\right(en{)}_{2}C{l}_2]Cl$
3. $\left[Pt\right(N{H}_3{)}_4\left]\right[PtC{l}_6]$
4. $\left[Co\right(N{H}_3{)}_{4}C{l}_2]N{O}_2$

Q. Ferric oxide crystallises in a hcp of oxide ions with two out of every tree octahedral voids occupied by ferric ions. Derive the formula of ferric oxide.

Q.

How to calculate the molarity of pure water if its density is given as 1000kg/m³.

Q.

What is the half-life of $\mathrm{Potassium}-40$?

Q. Which of the following is not a chiral molecule?

1. 1-Chloropentane
2. 2-Chloropentane
3. 1-Chloro-2-methyl pentane
4. 3-Chloro-2-methyl pentane

Q. Which one of the following complexes shows optical isomerism? (en = ethylenediamine)

1. $cis\left[Co\right(en{)}_{2}C{l}_2]Cl$
   
2. $trans\left[Co\right(en{)}_{2}C{l}_2]Cl$
3. $\left[Co\right(N{H}_3{)}_{4}C{l}_2]Cl$
4. $\left[Co\right(N{H}_3{)}_{3}C{l}_3]$

Q. An optically active halide when allowed to react with $C{N}^{-}$ gives a racemic mixture. The halide is most likely to be

1. Primary
2. secondary
3. tertiary
4. none of the above

Q. For the complex $[NiC{l}_4{]}^{2-}$, write
(i) The IUPAC name.
(ii) Hybridization of the central metal atom.
(iii) The shape of the complex.
(Atomic no. of Ni = 28)

Q.

Which pair of ions will have highest Ksp values of their sulphides.

(1) ${Zn}^{2+},{Cu}^{2+}$

(2) ${Pb}^{2+},{Hg}^{2+}$

(3) ${Zn}^{2+},{Mn}^{2+}$

(4) ${Cd}^{2+},{Bi}^{3+}$

Q. 41. [Nice(gly)2] shows two stereoisomers. Those are 1) geometrical 2) optical 3) both 4) no isomers

Q. Name : Two coloured metal ions

Q. (a) Write the formula of the following coordination compound :

Iron(III) hexacyanoferrate(II)

(b) What type of isomerism is exhibited by the complex $\left[Co\right(N{H}_3{)}_{5}Cl]S{O}_4$?

(c) Write the hybridisation and number of unpaired electrons in the complex [$Co{F}_6{]}^{3-}$. (Atomic No. of Co = 27)

Q.

The decay product of tritium is

a${}_1^{1}H$ b.${}_1^{2}H$ c.${}_2^{3}He$ d.${}_{-1}^0$e

1. b and c

2. a and d

3. a and b

4. c and d

Q. Chirality of carbon compound is because of its

1. Tetrahedral nature of carbon
2. Monovalent nature of carbon
3. Divalent nature of carbon
4. Trivalent nature of carbon

Q. A blue solid $A$ is formed when a brown gas $B$ is mixed with a colourless gas $C$. Identify $A$.

1. $NO$
2. $N_2{O}_5$
3. $N_2{O}_3$
4. $N{H}_3$

Q. Optical isomerism is exhibited by:

1. $\left[Co\right(en{)}_3{]}^{3+}$
2. $cis-\left[CrC{l}_2\right(ox{)}_2{]}^{3-}$
3. $\left[Co\right(ox\left)\right(en{)}_2{]}^{+}$
4. $trans-\left[CrC{l}_2\right(ox{)}_2{]}^{3-}$

Q. Tritium, a radioactive isotope of hydrogen, emits which of the following particles?

1. Gamma $\left(\gamma \right)$
2. Beta $\left(\beta \right)$
3. Alpha $\left(\alpha \right)$
4. Neutron (n)

Q. Tritium is a radioactive isotope of hydrogen. It emits :

1. $Neutrons$
2. $alpha-particles$
3. $beta-particles$
4. $gama-rays$

Q. Which one of the following are isoelectronic and isostructural?

1. $N{O}_3^{-},C{O}_3^{2-}$
2. $S{O}_3,N{O}_3^{-}$
3. $Cl{O}_3^{-},C{O}_3^{2-}$
4. $C{O}_3^{2-},S{O}_3$

Q.

1. 0.1
2. 0.9
3. 0.3
4. 0.6

Q. What is the difference between anomeric carbon and chiral carbon? Or what is anomeric carbon?

Q. 59 Which of the following complex ions is expected to absorb visible light? (At.no. Zn = 30, Sc = 21, Ti = 22, Cr = 24) (1) [Ti(en)2(NH3)2]4+ (2) [Cr(NH3)6]3+ (3) [Zn(NH3)6]2+ (4) [Sc(H2O)3(NH3)3]3+

Q. The correct set of four quantum numbers for the valence electron of Rubidium (Z = 37) is:

1. $n=5,l=0,m=0,s=+\frac{1}{2}$
2. $n=5,l=1,m=0,s=+\frac{1}{2}$
3. $n=5,l=1,m=1,s=+\frac{1}{2}$
4. $n=6,l=0,m=0,s=+\frac{1}{2}$

Q. Which of the following complex shows both geometrical and optical isomerism?

1. ${\left[Co{\left(N{H}_3\right)}_{5}C{l}_2\right]}^{2+}$
2. ${\left[Co{\left(N{H}_3\right)}_{4}C{l}_2\right]}^{+}$
3. ${\left[Co{\left(en\right)}_{2}C{l}_2\right]}^{+}$
4. ${\left[Cr{\left(ox\right)}_3\right]}^{3-}$

Q. Which of the following complex species is not expected to exhibit optical isomerism?

1. $\left[Co\right(en\left)\right(N{H}_3{)}_{2}C{l}_2{]}^{+}$
2. $\left[Co\right(en{)}_3{]}^{3+}$
3. $\left[Co\right(en{)}_{2}C{l}_2{]}^{+}$
4. $\left[Co\right(N{H}_3{)}_{3}C{l}_3]$