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Chemistry Test 2

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Chemistry Test 2
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  • Question 1
    4 / -1

    In which of the following pairs, the covalent radii is found to be similar?  , 
    (A) Mo, W  , 
    (B) Nb, Ta , 
    (C) Sc, Y , 
    (D) Hf, Lu 

    Solution

    Due to lanthanide contraction, there is a poor shielding of 4f electrons. In this phenomenon, the inner-shell electrons shield the outer-shell electrons in a way that their nuclear charge is not affected. Due to weaker shielding, the positively charged nucleus has a greater attraction to the electrons which leads to the decreased atomic radius on increasing the atomic number. Hence corresponding elements of second and third transition series have similar atomic radii. The correct option is B and A

     

  • Question 2
    4 / -1

    Which of the following will show highest solubility in the concentrated NaOH?

    Solution

    Due to the smallest size of Lu3+, the hydroxide of Lu will dissolve readily in the hot concentrated alkali.

     

  • Question 3
    4 / -1

    Given below is the trend of S-Block Element. Choose which of the following is in the correct order?

    Solution

    Be does not combine with hydrogen to form hydride. Therefore, the thermal stability of the hydrides is in such a manner. For the other options, the reverse order of the given order is correct.

     

  • Question 4
    4 / -1

    Which of the following statement is incorrect about the dimer AlCl3?

    Solution

    In aqueous solution, the covalent bond present in dimer are broken due to high hydration enthalpy of Al3+and Al complex and Cl- ion is formed.

     

  • Question 5
    4 / -1

    Which is the most preferred indicator when a strong acid is titrated with weak base?

    Solution

    In a titration of a strong acid vs weak base, an indicator with acidic range i.e. methyl red (pH = 4.4 – 6.5) is used.

     

  • Question 6
    4 / -1

    Select the appropriate hierarchy of (-I) effect for the following compounds 
    -Cl, -H, -CN, -F, -COOH

    Solution

    The appropriate hierarchy of (-I) effect for the following compounds: -NO2 > -CN > -COOH > -F > -Cl > -Br > -I > -OH > -OCH3 > -C6H5 > -H

     

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