IGNOU CHE 2 SOLVED ASSIGNMENT 2024

Ques 1.

Give the names of the chemists who discovered scandium and germanium.

Ques 2.

Explain Pauli’s exclusion principle and Hund’s rule.

Ques 3.

What is the difference between electron affinity and ionisation energy.

Ques 4.

Atomic size generally decreases across the period and increases down the group in the periodic table.

Ques 5.

The difference between the 1^st and the 2^nd ionisation energy of Li is much higher than that of Be.

Ques 6.

In Group 17, HF has abnormally high melting and boiling points as compared to other hydrides of the group.

Ques 7.

Intermolecular hydrogen bonding does not take place in p-nitrophenol.

Ques 8.

Physical properties of isotopes of hydrogen are different.

Ques 9.

Give the structure of the following complex ions:

i) [BeF₄]^2-

ii) [Be(C₂O₄)2] ^2-

Ques 10.

Give the reaction of aqua regia with gold.

Ques 11.

Explain giving suitable reactions whether NaNH₂ acts as an acid or a base inliquid ammonia.

Ques 12.

Give the method of preparation of pure crystalline boron.

Ques 13.

Why corundum finds many applications in abrasives, refractories and ceramics?

Ques 14.

Explain the structure of diborane.

Ques 15.

Explain the differences in structure and bonding in trimethylamine and trisilylamine.

Ques 16.

Give the process of extraction of phosphorous.

Ques 17.

What are the two allotropic forms of oxygen? Differentiate between them and write the method of preparation of each of these.

Ques 18.

Explain why there is large difference in the melting and boiling points of  oxygen and sulphur.

Ques 19.

How did Moissan prepare fluorine? What are the modifications done  to his method?

Ques 20.

Basic properties of halogens

Ques 21.

Nature and stability of halogen oxides

Ques 22.

What are clathrates? What is the criteria of formation of clathrates?

Ques 23.

What is the significance of beneficiation of ores? List various methods used for the same.

Ques 24.

What factors determine whether a complex is high spin or low spin?

Ques 25.

Describe the difference between a high spin and a low spin d⁶ complex.

Ques 26.

Explain which one of [Fe (H₂O₂)6]²⁺ and [Fe(CN)₆]^4- complex ions is high spin and which one is low spin?

Ques 27.

Chemical properties of the transition metals vary widely from element to element. In contrast, the inner-transition metals markedly resemble eachother chemically. Explain.

Ques 28.

All the lanthanide elements form generally stable compounds in +3 oxidation state. Then, why do cerium and europium form most stable compounds in + 4 and + 2 oxidation states, respectively?

Ques 29.

Why do many transition metals exhibit a +2 oxidation state in their compounds?

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