A metal is treated with dilute sulphuric acid. The  gas evolved is collected by the method shown in  the figure:  

A metal is treated with dilute sulphuric acid - Teachoo.jpg

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(a) Name the gas evolved:  

(i) Hydrogen 

(ii) Oxygen  

(iii) Sulphur dioxide gas 

(iv) Carbon dioxide  

 

Ans. 

 

When a metal is reacted with dilute sulphuric acid, hydrogen gas is evolved.

 

The reaction is as follows:

M + H 2 SO 4   →MSO 4 + H 2

Reaction of Metal with Acid - Teachoo.jpg

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So, the correct answer is (i) Hydrogen gas.



( b) Is the gas lighter or heavier than air? How will  you test the gas?  

 

Ans. 

 

Hydrogen gas is lighter than air

 

Test for presence of hydrogen gas:

  • When a burning splinter is brought near the gas, it burns with a pop sound. 
  • This pop sound is produced due to the burning of hydrogen gas.

Hydrogen Gas burns with a Pop Sound - Teachoo-01.jpg

(c) If the metal used above is zinc then write the  chemical equation for the evolution of gas.  

 

Ans. 

The reaction is as follows:

Zn(s) + H 2 SO 4 (dil) → ZnSO 4 (aq) + H 2 (g)↑  

Reaction of Metal with Acid (An Example).jpg

(d) What nature of hydrogen is used as a fuel in rocket:  

(i) solid 

(ii) liquid  

(iii) gaseous 

(iv) all of the above  

Ans. 

 

Liquid hydrogen is used as a fuel in rockets. 


So, the correct answer is (ii) Liquid

  1. Class 10
  2. Chapter 2 Class 10 - Acids, Bases and Salts (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo