10th Class Science Solved Paper - Science-2017 Delhi Set-I

  • question_answer A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate powder is a test tube. Name the gas and describe the test that confirms the identity of the gas.

    Answer:

    \[C{{H}_{3}}COOH+NaHC{{O}_{3}}\to C{{H}_{3}}COONa+C{{O}_{2}}+{{H}_{2}}O\]
    Gas evolved is\[C{{O}_{2}}\]. It is tested by passing \[C{{O}_{2}},\] in lime water which turns milky due to formation of insoluble\[CaC{{O}_{3}}\].
    \[Ca{{(OH)}_{2}}+C{{O}_{2}}\xrightarrow[{}]{{}}CaC{{O}_{3}}+{{H}_{2}}O\]


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