WORKSHEET OF HYDROGEN CHAPTER

 HYDROGEN

1.     The three isotopes of hydrogen are :
(a) __________________________
(b) __________________________
(c) __________________________

2.     Complete the reactions involved in the preparation of hydrogen gas.

Zn +    dil. HCl  à_____________________________________________
Zn +    excess conc. NaOH à ____________________________________

3.     Hydrogen in manufactured by electrolysis of water , it is a type of redox reaction. Complete the reaction indicated below :
(a)  H₂ O + Dilute acid + Electricity  à _____________ + ____________

4.     Complete the reactions showing properties of hydrogen gas.

(a)  H₂    +   O₂  à   ____________
(b) H₂    +   Na à _____________
(c)  H₂      +   Li à _______________
(d) H₂       +   K à _________________
(e) LiH + AlCl₃ à ________________

5.     Give one example each for the following:

(a) Electron Deficient Hydride.
(b) Electron Rich Hydride.
(c) Electron Precise Hydride.

6.     Draw the Lewis electron dot diagram of NH₃ à BH₃ (a Lewis acid base complex)

7. Give two reactions to show amphoteric nature of water.


8 . Give two reactions to show water undergoing redox reaction.


9. Give two examples of hydrolysis.

 

10.  What is HARDNESS of water?

 

 

 

 

11. Why hard water doesn’t form lather with soap ?

 

 

 

 

           12. Differentiate between temporary and permanent hardness of water ?




          13.  Give two methods of removal of temporary hardness.

(a) Reaction taking place on boiling temporary hard water.



(b) Reaction taking place on treating the temporary hard water with Ca(OH)₂   , CLARK’S METHOD.




14. Give two methods of removal of permanent hardness.

(a) Reaction involved in use of washing soda to remove permanent hardness.



(b) Reaction involved in use of CALGON      Na₆P₆O_18.

(c ) Reactions involved in use of Zeolite / organic resin / Permutit Method.



15.  Complete the following reaction in context to methods of preparation of hydrogen peroxide.


(a) BaO_2.8H₂O + H₂SO₄ à __________________________________________
(b) HSO₄^-   electrolysed à _________________ again electrolysed à
[c ] K₂S₂O₈  + D₂O à 2 KDSO₄ + ____________

 

16. Calculate the strength of 10 volume of hydrogen peroxide solution. (commercially 100 volume of hydrogen peroxide means 30% hydrogen peroxide)



17. OBSERVE THE TWO STRUCTURE FORMULA’S CAREFULLY AND WRITE THE POINTS OF DIFFERENCES.

STRUCTURE OF HYDROGEN PEROXIDE IN GAS	STRUCTURE OF HYDROGEN PEROXIDE IN SOLID

 

18. Hydrogen peroxide shows both oxidizing and reducing properties.
(a) Show the oxidizing property of hydrogen peroxide in acidic medium.


(b) Show the reducing property hydrogen peroxide in acidic medium.

 

 

(c) Show the oxidizing property of hydrogen peroxide in basic medium.




(d) Show the reducing property of hydrogen peroxide in basic medium.