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Chemistry Test - 24

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Chemistry Test - 24
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which among the following polymers have lowest solubillty?

    Solution

    Epoxy resin is a cross-linking polymer which has lowest solubility among them.

  • Question 2
    1 / -0

    The characteristics of condensation polymerization are given below-

    I. only −C−C− linkages present in the polymer structure

    II. use of bifunctional or polyfunctional monomers

    III. elimination of a small byproduct molecule

    Which of the following is true?

    Solution

    Besides −C−C− linkages, polymer structure also contains atoms as O, N, etc., at regular intervals in the main chain.

  • Question 3
    1 / -0

    Which among the following formation is not an example of Covalent bond?

    Solution

    LiF (Lithium Fluoride) is an example of Ionic bond, as the formation takes place by transfer of electrons and not by sharing.

  • Question 4
    1 / -0

    What is the potential energy of a box in (ft)(lbf), kept on a wall having a height 20 ft above the surface? Assume that the mass of the box is 100 lb.

    Solution

    PE = mgh, g = 32.2 ft/s2.

  • Question 5
    1 / -0

    Which one have both sigma and pi bonds?

    Solution

    In NaCN both double bond and triple bond is present and hence it has both sigma and pi bonds.

  • Question 6
    1 / -0

    What is the product of following polymerization reaction?

    Solution

    The lactone ring opens by breaking C─O bond and polymerizes to give [─O─R─CO─]n.

  • Question 7
    1 / -0

    Ten covalent bonds in the Lewis structure of Propane will account for how many valence electrons?

    Solution

    From the Molecular formula of Propane (C3H8), 3C has 3*4=12 valence electrons and 8H has 8*1=8 valence electrons and hence total valence electrons is given by their sum: 12+8=20.

  • Question 8
    1 / -0

    Which one has zero dipole moment?

    Solution

    The ring of benzene is completely closed and is of perfect stability and hence it has zero dipole moment.

  • Question 9
    1 / -0

    Which of the following byproduct is released when an amine reacts with acid chloride?

    Solution

    The amidation reaction is given by-

    ─NH2 + ─COCl ↔ ─NH─CO─ + HCl.

  • Question 10
    1 / -0

    Consider the following statements for condensation polymerization-

    I. Bifunctional or polyfunctional monomers

    II. Loss of each kind of functional group in each step for bifunctional species

    III. Always accompanied by the release of a byproduct molecule

    IV. Monofunctional or polyfunctional monomers

    Which of the following are true?

    Solution

    III is not true because in some reactions, there is no elimination of any molecule. Besides, monofuntional monomers fail to complete the reaction. At each step of reaction, two functional groups, one of each kind, are lost.

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