Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

What are inner transition elements?

Use Hund’s rule to derive the electronic configuration of Ce³⁺ ion and calculate its magnetic moment on the basis of ‘spin-only’ formula.

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:

Electronic configurations

Write down the number of 3d electrons in the following ion:

Cu²⁺

Indicate how would you expect the five 3d orbitals to be occupied for this hydrated ions (octahedral).

Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

What can be inferred from the magnetic moment value of the following complex species?

What is meant by the chelate effect?

Classify the following as addition and condensation polymers: Terylene, Bakelite, Polyvinyl chloride, Polythene.

Explain the difference between Buna-N and Buna-S

Distinguish between the terms homopolymer and copolymer and give an example of each.

How do you explain the functionality of a monomer?

Define the term polymerisation.

Is (-NH - CHR - CO-)_n a homopolymer or copolymer?

Write the name and structure of one of the common initiators used in free radical addition polymerisation.

While antacids and antiallergic drugs interfere with the function of histamines, why do these not interfere with the function of each other?

Why are cimetidine and ranitidine better antacids than sodium hydrogen carbonate or magnesium or aluminium hydroxide?

Write the names and structures of the monomers of the following polymers: Buna-S

Write the names and structures of the monomers of the following polymers: Dacron 

Convert 3-Methylaniline into 3-nitrotoluene.

Convert aniline into 1, 3, 5-tribromobenzene.