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Chemistry Quiz
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The most electropositive element is:
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The outer electronic configuration of K, Cu, and Cr are, respectively.
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Which element exhibits both +1 or +3 oxidation states in its compounds?
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Select the correct order of ionic radii
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Which is the largest stable atom?
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Europium belongs to:
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The oxidation state of Cr in potassium dichromate and potassium chromate respectively, are:
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Alkali metals in each period have:
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Which gaseous ion in its ground state has the greatest number of unpaired electrons?
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Identify the least stable ion amongst the following
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The lanthanide contraction is responsible for the fact that:
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Which of the following is the smallest cation?
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Which of the following has lowest ionization enthalpy?
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Which of the following has largest size
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How many unpaired electrons are in a gaseous Fe2+ ion in its ground state?
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Which property of an element is most dependent on the shielding effect?
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Ionic radii are
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Eka-aluminum and eka-silicon are known as:
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An element having atomic number 56 belongs to which block?
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An element of atomic number 29 belongs to
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The most electronegative element is
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Which of the following has the largest atomic size?
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Which of the following has the largest radius?
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The outer electronic configuration of most electronegative element is
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All of the following are true with respect to carbonyls EXCEPT:
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An electron is known to be in the n = 4 shell and the l = 2 subshell. How many possible combinations of quantum numbers could this electron have?
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A metallic oxide contains 66% of the metal. The equivalent weight of the metal is
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The specific heat of metal is 0.16, its approximate atomic weight would be
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The equivalent weight of KMnO4 (in acid medium) is (At.wt.of K =39, Mn=55)
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The hydrogen phosphate of certain metals has the formula MHPO4. The formula of metal chloride would be
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Bassemerisation is carried out for
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Lead is mainly extracted by
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Extraction of aluminum from bauxite ore reduction is carried out by
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Rutile is separated from chalcopyrite by
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The ore which is concentrated by wetting oil is
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Haematite ore is concentrated by
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Froth flotation process for the concentration of sulfide ores is an illustration of the practical application of
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Three most occurring elements into the earth crust are
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The metal which mainly occurs as oxide ore in nature is
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Which one contains both Calcium and Magnesium
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Natural refractory material used in furnaces is
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The process of isolation of a metal by dissolving the ore in suitable reagent followed by precipitation of metal by a more electropositive metals is called
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The percentage of P2O5 in diammonium phosphate (NH4)2HPO4 is
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Born Haber cycle can be used to estimate
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The hydration energy of Mg²+ ions is lesser than that of
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Second electron gain enthalpy is
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The second ionization potential of elements is higher than its second ionization potential because
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The second ionization energy is maximum for
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The ionization potential of Boron is less than that of Beryllium because
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The period number and group number of Tantalum (z=73) are respectively
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Which element is named after the name of a planet?
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According to modern periodic law, the properties of elements repeat at regular intervals when elements are arranged in order of
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Which of the following statements is incorrect about the adsorption theory?
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Rusting of iron is an example of
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The type of corrosion that is very dangerous and difficult to monitor is
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In galvanic series, Which metals are most passive?
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Rusting of Iron is enhanced by
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Dry corrosion is
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Corrosion is accelerated by.....
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which one of the following elements shows both positive and negative oxidation state?
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