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Chemistry Test - 13

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Chemistry Test - 13
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Weekly Quiz Competition
  • Question 1
    4 / -1

    What are the products of the decomposition of limestone?

    Solution

    Calcium carbonate is strongly heated until it undergoes thermal decomposition to form calcium oxide and carbon dioxide.

  • Question 2
    4 / -1

    The halogen with the highest value of ionisation energy is

    Solution

    Fluorine has highest value of electro negativity. Hence it has highest ionization energy.

  • Question 3
    4 / -1

    Which of the following gases is evolved on heating ammonium dichromate?

    Solution

    Nitrogen gas is evolved as the following reaction takes place:

    (NH4)2 Cr2O7 Cr2O2 + N2 + 4H2O

  • Question 4
    4 / -1

    In the complexes [Fe(CN)6]3- and [Fe(C2O4)3]3-, the respective coordination numbers of Iron is

    Solution

    In both the complex the coordination of iron is 6 each.

  • Question 5
    4 / -1

    Metamerism is shown by

    Solution

    Metamerism is shown by the compounds containing different alkyl groups containing at least two carbon atoms each on either sides of the S, O or NH.

  • Question 6
    4 / -1

    0.833 mole of a carbohydrate with empirical formula CH2O, has 1g of hydrogen. Molecular formula of carbohydrate is

    Solution
    Let the Molecular formula of carbohydrate be equal to \(\left(\mathrm{CH}_{2} \mathrm{O}\right) \mathrm{n}\)
    In 1 mole of carbohydrate there is \(2 n \times 1=2 n\) g of hydrogen present
    So, 0.0833 mole of carbohydrate there is \(\frac{2 n}{1} \times 0.0833\) g of hydrogen which is equal to 1 . 9
    \(2 n \times 0.0833=1\)
    or \(n=6\)
    So the Molecular Formula of carbohydrate is \(=\left(\mathrm{CH}_{2} \mathrm{O}\right)_{6}=\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\)
  • Question 7
    4 / -1

    Among the following, the correct order of basicity is

    Solution
    The correct order of the basicity is
    \[
    \mathrm{NH}_{2}^{-}>\mathrm{RO}^{-}>\mathrm{OH}^{-}>\mathrm{RCO}^{-}
    \]
    \(\mathrm{NH}_{2}^{\mathrm{is}} \mathrm{most}\) basic and \(\mathrm{RCOO}^{-}\) is the lost
  • Question 8
    4 / -1

    What is the increasing order of the first ionisation enthalpies of the elements B, P, S and F?

    Solution

    The value of first ionization energy decreases on moving from top to bottom in a group and increases on moving from left to right across a period in the periodic table.

  • Question 9
    4 / -1

    When lead nitrate is heated, it gives

    Solution

    Lead nitrate when heated will decompose forming lead oxide, nitrogen oxide, and oxygen.

    Equation:

    2Pb(NO3)2 will give 2PbO + 4NO2 + O2

  • Question 10
    4 / -1

    Ethene is prepared by

    Solution
    \(\begin{array}{ccc}\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} & \frac{\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4}(\text { excess })}{443 \mathrm{K}} & \mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}+\mathrm{H}_{2} \mathrm{O} \\ \text { ethanol } & & \text { ethene }\end{array}\)
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