CBSE Class 12th Chemistry Set III solved Question Paper 2012

CBSE Chemistry Set- III Solved Question Paper 2012, given here.

Here you can find Chemistry Solved Question Paper. Save your time and take the help while solving the Chemistry question paper set-III this paper will help you in scoring exceptionally well mark in Chemistry paper

Some solved questions from CBSE Class 12th Chemistry Question Paper (Set-III) are given here

Q. What is meant by the term ‘forbidden zone' in reference to band theory of solids?

Answer. It is the gap between filled valence band and the next higher unoccupied band (conduction band).

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Q. Why is the adsorption phenomenon always exothermic?

Answer. When adsorption takes place, new bonds are formed between adsorbate & adsorbent which lowers the temperature of that substance leads to negative 𝜟H value.

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Q. Although the H-bonding in hydrogen fluoride is much stronger than that in water, yet water has a much higher boiling point than hydrogen fluoride. Why?

Answer. Hydrogen bonding of HF is stronger than water but it has lower boiling point than water because HF forms only single hydrogen bond whereas in water, it has multiple hydrogen bonds, which, when summed, have a greater intermolecular force than that of HF, leads to high boiling point.

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Q. Write the full forms of DNA and RNA.

Answer. DNA- Deoxyribonucleic acid
RNA- Ribonucleic acid

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Q. What is meant by 'narrow spectrum antibiotics’?

Answer. Narrow-spectrum antibiotics: - they are antibiotics which are active against a selected group of bacterial infections. For example- Penicillin G

Q. Define the following terms:
(i) Order of a reaction
(ii) Activation energy of a reaction

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Answer. i. Order of a reaction: - it is the sum of the powers of the concentrations of reactants which is expressed in the rate law expression.
ii. Activation energy of a reaction: - it is the energy required to form an activated complex in any reaction.

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