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کاربوکسلک تیزاب

بارہویں جماعت · کیمیا · 5 سوالات

نام: ____________________   تاریخ: ____________

  1. Ethanoic acid is the main acid in:

    • A Milk
    • B Vinegar
    • C Lemon juice
    • D Tea

  2. Carboxylic acids react with sodium carbonate to release:

    • A Ammonia
    • B Carbon dioxide
    • C Hydrogen
    • D Oxygen

  3. Reaction of an acid with an alcohol gives an ester and:

    • A Hydrogen
    • B Oxygen
    • C Carbon dioxide
    • D Water

  4. Esters are often responsible for:

    • A Fruity smells
    • B Colours of metals
    • C Bitter taste
    • D Salty taste

  5. Soap is made by the alkaline hydrolysis of fats, called:

    • A Saponification
    • B Hydrogenation
    • C Fermentation
    • D Esterification

جوابی کلید

1. B, 2. B, 3. D, 4. A, 5. A

  1. Vinegar contains about 5 percent ethanoic acid.

  2. They are acidic enough to release CO2 from carbonates.

  3. Esterification releases water.

  4. Many esters have pleasant fruity odours.

  5. Saponification gives soap and glycerol.