Acids, Bases and Salts
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Give two physical characteristics each of acids and bases.

Acids are,
(i) sour in taste.
(ii) change the colour of blue litmus to red.

Bases are,
(i) bitter in taste.
(ii) change the colour of red litmus to blue.

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    Which of the following is not a neutralization reaction?
    •  NaOH + HCl → NaCl + H2O

    • H+ + OH– → H2O

    • Na2CO3 + H2SO4 → Na2SO4 + H2O + CO2
    • AgNO3 + HCl → AgCl + HNO3
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    • acetic acid
    • citric acid
    • hydrochloric acid
    • lactic acid
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    What are indicators? Name four acid-base indicators and mention their colour change.
    Answer
    During the manufacture of sodium carbonate by Solvay process, material consumed are:
    • sodium chloride and limestone
    • sodium chloride and ammonia
    • limestone, ammonia and sodium chloride
    • limestone, ammonia, sodium chloride and carbon dioxide
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