NIOS CLASS 12 | CHEMISTRY | GUESS QUESTIONS FOR EXAM | SET - 1

1.  Write down the names of three quantum numbers and write what they represent. 

2.  Calculate the wavelength of the spectral line in Lyman series corresponding to n = 3. 

3.  Define empirical formula and molecular formula. 

4.  What is coagulation? Why does clotting of blood take place on applying FeCl3 solution?

5.  Differentiate between an isolated system and a closed system. 

6.  Write down the structure and uses of Bakelite. 

7.  Why detergents containing linear alkylbenzene sulphonate are better detergents over branched counterparts? 

8. Write down the balanced chemical equations for the following :

(a) Stannous chloride (acidified) reacts with O3.

(b) Copper reacts with concentrated H2SO4.

 9. Derive the expression for the degree of dissociation of weak acid. What is the effect of common ion on the degree of dissociation? 

10. How will you prepare? (Give chemical equation.)

(a) Ethene from chloroethane
(b) Toluene from chlorobenzene
(c) Butan-1-ol from propyl magnesium bromide
(d) 2,4,6-Tribromophenol from phenol

 11. Explain the following (give chemical equation also) :

(a) Hoffmann bromamide reaction
(b) Hell-Volhard-Zelinsky reaction
(c) Wolff-Kishner reduction