Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ]

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Question 27 - Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ] - Solutions to CBSE Sample Paper - Science Class 10

Last updated at April 16, 2024 by

The diagram shows the reaction between metal and dil. Acid.

Q 27 - different behaviour of Mg in test tube B - Teachoo.jpg

What is the reason for different behaviour of Mg in test tube B? 

(A) Mg is lighter element than dil. HCl 

(B) Mg reacts with dil. HCl to produce H 2 gas which helps in floating 

(C) Mg reacts with dil. HCl to produce N 2 gas which helps in floating 

(D) Mg reacts with dil. HCl to produce CO 2 gas which helps in floating

 

Answer - 

Reactive Metals react with acid to form Hydrogen gas.

 

reaction-of-metal-with-acid.jpg

Now, reactive metals is decided on the basis of reactivity series

reactivity-series-of-metals.jpg

 

Since

  • Zn, Fe and Cu are less reactive, they do not react with acid
  • Also, Mg is more reactive, so it reacts with HCl to form Hydrogen gas , which helps in floating

So, the correct answer is (b)

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo