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Chemistry Test ...

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  • Question 1
    1 / -0

    The atomic numbers of vanadium (V) , chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23,24,25, and 26. Which one of these may be expected to have the highest second ionization enthalpy?

  • Question 2
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    When MnO2  is fused with KOH, a coloured compound is formed, the product and its colour is

  • Question 3
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    Mixture \(X=0.02\) mole of \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}\) and 0.02 mole of \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}\)

    was prepared in 2 L of solution. 1 Lof mixture \(X+\operatorname{excess} A g N O_{3} \rightarrow Y\)

    \(1 \mathrm{L}\) of mixture \(\mathrm{X}+\mathrm{excess} \mathrm{BaCl}_{2} \rightarrow \mathrm{Z}\)

    Number of moles of \(\mathrm{Y}\) and \(\mathrm{Z}\) are :

  • Question 4
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    6.2 g of a sample containing Na2CO3, NaHCO3 and non - volatile inert impurity on gentle heating loses 5% of its weight due to reaction 2NaHCO3⟶  Na2 CO3 + H2O + CO2. Residue is dissolved in water and formed 100 mL solution and its 10 mL portion requires 7.5 mL of 0.2 M aqueous solution of BaCl2 for complete precipitation of carbonates.
    Determine weight (in gram) of Na2CO3 in the original sample.

  • Question 5
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    Hydrolysis of phenyl isocyanide forms :

  • Question 6
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    Number of oxygen atoms shared per \(\mathrm{SiO}_{4}^{4-}\)tetrahedron in

    (i) Two dimensional sheet structured silicates,

    (ii) Cyclic silicates and

    ​(iii) Single strand chain silicates are, respectively

  • Question 7
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    What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1), sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4) ?

  • Question 8
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    Column I                      Column II
    (A) He                          (i) High electron gain enthalpy
    (B) Cl                           (ii) Most electropositive element
    (C) Ca                          (iii) Strongest reducing agent
    (D) Li                            (iv) Highest ionization energy

    The correct match of contents in Column I with those in Column II is:

  • Question 9
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    Consider the following reaction.

    Identify the structure of the major product X.

  • Question 10
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    Which of the following is present in DNA ?

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