CBSE Class 10 Science 2023 Outside Delhi Set 1

Question : 12

Total: 39

Consider the following chemical equation I and II
I. Mg+2‌HCl→MgCl2+H2
II. NaOH+HCl→NaCl+H2O
The correct statement about these equations is:

' I ' is a displacement reaction and 'II' is a decomposition reaction.
' I ' is a displacement reaction and 'II' is double displacement reaction.
Both ' I ' and 'II' are displacement reactions.
Both 'I' and 'II' are double-displacement reactions.

Solution:

Mg( s)+2‌HCl(aq)→MgCl2(aq)+H2(g)
Magnesium, being more reactive than hydrogen, displaces it in a chloride molecule, resulting in a single displacement reaction.
NaOH(aq)+HCl(aq)→NaCl(aq)+H2O(l)
In a doubledisplacement reaction, the reactants exchange ions and form new compounds. The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) to form a salt (NaCl) and water (HOH) is an example of a double displacement reaction, specifically a neutralisation reaction.

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