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RESOURCES CH-1 GEOGRAPHY QUESTION ANSWER CLASS 10

on December 20, 2018

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THE STORY OF MY LIFE QUESTION ANSWER

1 What account does Helen Keller give of her family? 10 ANS: Helen Keller tells about her family that her father was from the line of Casper Keller who was a native of Switzerland and settled in Maryland. One of her Swiss ancestors, was the first teacher of the deaf in Zurich. Her grandfather, Casper Keller’s son was settled in Alabama. Her grandmother Keller was a daughter of Alexander Moore. She was also second cousin to Robert E. Lee. Her father, Arthur H. Keller, was a captain in the confederate Army. Her mother, Kate Adams, was his second wife. Her grandfather, Benjamin Adams, married Susanna E. Goodhue. He lived in Newbury, Massachusetts. Their son, Charles Adams, was born in Newburyport, Massachusetts. He had moved to Helena. He married Lucy Helen Everett, who belonged to the same family of Everett’s as Edward Everett and Dr. Edward Everett Hale. 2 Give a brie

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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 is used to extinguish fire. Why? 1 ANS: It is because properties of compound (H 2 O) are differ

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RESOURCES CH-1 GEOGRAPHY QUESTION ANSWER CLASS 10

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