Important Questions for CSIR NET Chemical Science - Inorganic Chemistry- Part IV

Most Important Questions Inorganic Chemistry- Part IV

1. When it comes to the bonding of the ligands Me3N and Me3P with the metal ions Be2+ and Pd2+, the accurate statement is,

1. The ligands bind equally strong with both the metal ions as they are dicationic.
2. The ligands bind equally strong with both the metal ions as both the ligands are pyramidal.
3. The binding is stronger for Me3N with Be2+ and Me3P with Pd2+.
4. The binding is stronger for Me3N with Pd2+ and Me3P with Be2+

2. The oxy form of hemocyanin is ............. in colour with wave no. Of O-O bond at ...

1. Blue, 755cm-1
2. Blue, 1160cm-1
3. Violet pink, 755cm-1
4. Violet pink, 1160cm-1

3. With respect to the covalent character, following is the correct option:

1. CuCl=NaCl; AgCl > KCl
2. CuCl<NaCl; AgCl< KCl
3. CuCl> NaCl; AgCl>KCl
4. CuCl>NaCl; AgCl=KCl

4. Give correct order for Ionisation potential of following: 

B, Be, N, O, F, Ne

1. Ne > F > O > N > B > Be
2. Be > N > B > Ne > F > O
3. B > Be > O > N > F > Ne
4. Ne > F > N > O > Be > B

5. The number of microstates for d5 electronic configuration is:

1. 21×63
2. 14×63
3. 7×62
4. 28×63

6. The correct statement amongst the following is/are: 

     i) Only U and Th occur naturally in significant quantities among actinoids. 

     ii)Base strength and solubility increase on crossing lanthanide series.

     iii) The coordination no. of [La (NO3-O, O’)6]3- is 6.

     iv) [Ce (CO3-O, O’)5]6- is a 10-coordinate species.

1. I, ii, iv
2. I and iv
3. ii and iii
4. Only iii

7. The compound HMn(CO)5 will show how many peaks in 1H NMR. 

(Given for Mn, I = 5/2)

1. 6 peaks, sharp
2. 6 peaks, broad
3. 2 peaks, sharp
4. 2 peaks, broad

8. Among the following, the incorrect statement about SiC is that

1. it is known as corundum
2. It is prepared by reducing quartz with a slight excess of coke in an electric furnace at 2000 – 2500 oC.
3. Pure SiC is almost colourless or pale yellow.
4. Its hardness is slightly less than diamond.

9. Which of the following is true for [MLn (CR2)], where M is transition metal, L is ligand and CR2 is a Schrock carbene?

1. L is a pi acceptor ligand.
2. R is a pi donor ligand.
3. The carbon centre is nucleophilic.
4. Metal M is in a low oxidation state.

10. Ce3+ is colourless but shows absorption in the UV region due to:

1. f-f transition
2. Charge transfer
3. D-F transition
4. f-d transition

Answer Key:

1. C
2. A
3. C
4. D
5. C
6. B
7. B
8. A
9. C
10. D

Solutions:

Solution 1. According to Pearson's HSAB principle, hard acids prefer binding to the hard bases to give ionic complexes, whereas soft acids prefer binding to soft bases to give covalent complexes. NMe3 is a hard ligand while PMe3 is a soft ligand. Therefore, NMe3 binds with hard acid (metal ion) Be++ and PMe3 bind with soft acid (metal ion) Pd++.

Solution 2. Hemocyanin is a non-heme oxygen transport protein. Unlike its name, it does not have a heme group or cyanide group. It exists in two forms –oxy and deoxy. The oxy form of hemocyanin is blue in colour due to LMCT from O22- to Cu+2. In this, peroxide is present, so its wave no. is 755cm-1.

Solution 3. Referring to the Fajan’s Rule,

Ag+ has 18e- in the valence shell, which is pseudo inert gas electronic configuration.

K+ has an inert gas electron configuration.

So, AgCl>KCl

Similarly, Cu+1 is 3s2 3p6 3d10 which is 18 electrons, pseudo inert gas electron configuration.

Na+ is 2s2 2p6 which is 8 electrons, inert gas configuration.

So, CuCl> NaCl

Solution 6. I and iv statements are correct because-

1. i) Uranium and Thorium are the naturally occurring actinoids that occur in significant amounts amongst all the actinoids.
2. iv) [Ce (CO3-O, O’)5]6- is a 10-coordinate species because CO3 has two coordinating sites CO3-O, O’ so it is a bidentate ligand and 5 such ligands will coordinate through 10 sites. So, the coordination number will be 10.

ii and iii statements are incorrect because-

1. ii) base strength and solubility decrease on crossing lanthanoid series because
2. size decreases and covalent character increases while we move from La to Lu.
3. more is hard-hard/ soft-soft interactions more is stability and less is solubility.

iii) [La (NO3-O, O’)5]6- is a 12-coordinate species because NO3 has two coordinating sites NO3-O, O’ so it is a bidentate ligand and 6 such ligands will coordinate through 12 sites. So, the coordination number will be 10. So, coordination no. of [La (NO3-O, O’)6]3- is 6 is an incorrect statement.

Solution 7. As Mn is NMR active, it will interact with H and No. of peaks will be given by 2nI+1

I = 5/2

Peaks = 2.1.5/2+1 = 6

And as I >1, the peaks will be broad. Thus, the answer is (B).

Solution 8. SiC is known as carborundum

Solution 9. In Schrock carbene, carbene carbon is electron-rich due to which it is nucleophilic in nature and easily attacked by electrophiles. R cannot be a pi donor ligand because they will destabilise the carbene. Here, metal atoms are electron deficient, therefore have a high oxidation state. To remove electron deficiency, metal M is connected to electron donor ligands.

Solution 10. The valence shell electronic configuration of Ce3+ = f1. Therefore, it will show a transition from 4f to 5d. This is a huge energy gap and shows strong absorption in the UV region.

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• Study Notes for CSIR NET Life Science - (Download PDF)
• Study Notes for CSIR NET Chemical Science - Download PDF Here!

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