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NCERT Solutions for Class 10 Science Chapter 2 Acids Bases and Salts

This content is part of NCERT Solutions for Class 10 Maths Chapter 2 Acids Bases and Salts

Chemical Properties of Acids:

 1. Action with metals: Dilute acids like dilute HCI and dilute H2SO4 react with certain active metals to evolve hydrogen gas.

             2Na(s) + 2HCI (dilute) 2NaCI(aq) + H2 (g)

             Mg(s) + H2SO4 (dilute) MgSO4 (aq) + H2(g)

 Metals which can displace hydrogen from dilute acids are known as avtive metals. e.g. Na, K, Zn, Fe, Ca, Mg etc.

           Zn(s) + H2SO4 (dilute) ZnSO4(aq) + H2(g)

The active metals which lie above hydrogen in the activity series are electropositive in nature. Their atoms lose electrons to form positive ions and these electrons are accepted by H+ ions of the acid. As a result, H2 is evolved.

             For e.g.

Zn(s) Zn2+ (aq) + 2e-

ZH+(aq) + SO42-(aq) + 2e-           H2 (g) + SO42- (aq)

Zn(s) + 2H+ (aq)             Zn++(aq) + H2(g)

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NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations

This content is part of NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Characteristics of a Chemical Reaction:

 When we heat sugar crystals they melt and on further heating they give steamy vapour, leaving behind brownish black mass. On cooling no sugar crystals appears. Thus change which takes place on heating sugar is a chemical change and the process which brings about this chemical change is called chemical reaction.

 §  In this reaction the substance which take part in bringing about chemical change are called reactants.

 §  The substance which are produced as a result of chemical change are called products.

§  These reactions involve braking and making of chemical bonds.

 §  Product(s) of the reaction is/are new substances with new name(s) and chemical formula.

 §  It is often difficult or impossible to reverse a chemical reaction.

 §  Properties of products formed during a chemical reaction are different from thos of the reactants.

 §  Apart from heat other forms of energies are light and electricity which are also used in carrying out chemical changes.

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20-Minute Shrimp Alfredo Pasta

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Is this how you roll?

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blueberry pudding cake

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