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Chemistry Test 40

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Chemistry Test 40
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  • Question 1
    4 / -1

    Which of the following is fully fluorinated polymer?

    Solution

    {CF2 – CF2} is Teflon poly tetrafluoro ethylene. 
    Hence, option B is correct.

  • Question 2
    4 / -1

    Which of the following reagents may be used to distinguish between phenol and benzoic acid?

    Solution

    FeCl3 forms violet complex with phenol whereas it forms buff coloured ppt with Benzoic Acid. 
    Hence, option D is correct.

  • Question 3
    4 / -1

    The best reagent to convert pent -3- en-2-ol into pent -3-en-2-one is

    Solution

    Chromic anhydride in glacial acetic acid is the reagent to convert pent -3- en-2-ol into pent -3-en-2-one. 
    Hence, option C is correct.

  • Question 4
    4 / -1

    A reaction involving two different reactants can never be

    Solution

    Unimolecular reaction can never involve in two different reactants. 
    Hence, option A is correct.

  • Question 5
    4 / -1

    Which of the following statement is incorrect regarding physissorptions?

    Solution

    Enthalpy of adsorption in physisorption is negative 
    ΔG = ΔH - TΔS 
    As the entropy decreases (ΔS = –ve) the ΔH must be negatie having a high magnitude. Therefore, the spontaneous adsorption will have negative enthalpy change. 
    Hence, option D is correct.

  • Question 6
    4 / -1

    K, Mg and C continuous to burn in sulphur dioxide because

    Solution

    SO2 is neither combustible nor supports combustion but strongly burning K, Mg and C continues to burn in it because SO2 decomposes into S and O2 by means of heat of burning metal 
    SO2 + 2Mg → 2MgO + S 
    SO2 + C → CO2 + S 
    SO2 + H2O → H2SO3 
    Hence, option D is correct.

  • Question 7
    4 / -1

    Which one of the following types of drugs reduces fever?

    Solution
    • Antipyretic drugs are used to reduce fever.
    • Antibiotic used to treat diseases caused by bacteria. Antibiotics cannot treat viral infections, such as cold, flu, and most coughs.
    • Analgesic is used to reduce fever and relieve mild to moderate pain from conditions such as muscle aches, toothaches, common cold, and headaches. It may also be used to reduce pain and swelling in conditions such as arthritis.
    • Tranquilizer has a calming effect and eliminate both the physical and psychological effects of anxiety or fear.
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