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SAMPLE PAPER OF ENGLISH COMMUNICATIVE ISSUED BY CBSE CLASS 10 2019

on December 21, 2018

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CHEMISTRY CH-1 CHEMICAL REACTION AND EQUATION QUESTION ANSWER

1 State one basic difference between a physical change and a chemical change. 1 ANS: In physical change, no new substance is formed whereas in a chemical change a new substance(s) is/are formed. 2 What is meant by a chemical reaction? 1 ANS: The reaction representing a chemical change is called chemical reaction. 3 AgNO 3 ( aq ) + NaCl( aq ) → AgCl( s ) ↓ + NaNO 3 ( aq ) FeS + H 2 SO 4 → FeSO 4 + H 2 S ↑ Consider the above mentioned two chemical equations with two different kinds of arrows ( ↑ and ↓) along with product. What do these two different arrows indicate? 1 ANS: ↑ shows the gas evolved whereas ↓ shows insoluble substance (precipitate) formed. 4 Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, yet water which is a compound made up of hydrogen and oxygen i...

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SAMPLE PAPER OF ENGLISH COMMUNICATIVE ISSUED BY CBSE CLASS 10 2019

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