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Chemistry Test ...

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  • Question 1
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    In any period, the valency of an element with respect to oxygen.

  • Question 2
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    Which of the following statements is/are incorrect about valence bond theory?

    1. The electron pair bond is formed through the interaction of paired electrons on each of the two atoms.

    2. The spins of the electrons have to be opposite.

    3. Once paired, the two electrons can take part in additional bonds.

  • Question 3
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    A certain substance absorbed light of \(\lambda=4700\) A and produced fluorescence. If \(47 \%\) light was re-emitted as fluorescence and the ratio of quanta out of the number of quanta absorbed was \(0.5,\) then the wavelength of re-emitted light would be :

  • Question 4
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    Directions: The following question has four choices, out of which only one is correct.

    A solid (A), which has photographic effect, reacts with the solution of a sodium salt (B) to give pale yellow precipitate (C). Sodium salt, on heating, gives brown vapours. Identify A, B and C.

  • Question 5
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    A hydrogen like ion is an ion containing only one electron. The energies of the electron in a hydrogen like ion are given by \(\quad E_{n}=-\left(2.18 \times 10^{-18}\right) Z^{2}\left(\frac{1}{n^{2}}\right)\) joules, where, \(n\) is the principal quantum number and \(Z\) is the atomic number of the element. Then the ionisation energy (in \(kJ mol -1\) ) of the He+ ion is:

  • Question 6
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    The formation of the oxide ion O2−(g) requires first an exothermic and then, an endothermic step as shown below,

    O(g)+e⟶O(g); ΔH=−142kJ/mol.

    O(g)+e⟶O2−(g); ΔH=844kJ/mol.

    This is because:

  • Question 7
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    Which of the following represents the correct order of increasing first ionization enthalpy for Ca,Ba,S,Se and Ar?

  • Question 8
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    Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its electrons and therefore would exist as Hg80+. Energy required for the step is:

    Hg79+(g)→Hg80+(g)+e

  • Question 9
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    Amongst the following elements (whose electronic configurations are given below) the one having the highest ionization is:

  • Question 10
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    For Be, Zeff=1.95 and for Bex+,Zeff=2.30. Hence, ion is:

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