Q: The electronegativity of an element increases with increasing of what state?   Read this paragraph and choose the correct option from the provided answers:  Oxides As with the halides, the nature of bonding in oxides of the transition elements is determined by the oxidation state of the metal. Oxides with low oxidation states tend to be more ionic, whereas those with higher oxidation states are more covalent. These variations in bonding are because the electronegativities of the elements are not fixed values. The electronegativity of an element increases with increasing oxidation state. Transition metals in low oxidation states have lower electronegativity values than oxygen; therefore, these metal oxides are ionic. Transition metals in very high oxidation states have electronegativity values close to that of oxygen, which leads to these oxides being covalent. The oxides of the first transition series can be prepared by heating the metals in air. These oxides are Sc2O3, TiO2, V2O5, Cr2O3, Mn3O4, Fe3O4, Co3O4, NiO, and CuO. Alternatively, these oxides and other oxides (with the metals in different oxidation states) can be produced by heating the corresponding hydroxides, carbonates, or oxalates in an inert atmosphere. Iron(II) oxide can be prepared by heating iron(II) oxalate, and cobalt(II) oxide is produced by heating cobalt(II) hydroxide:.   Choices:  - isolation  - evaporation  - conduction  - oxidation   A:
oxidation
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Q: What are biofilms resistant to many common forms of?   Read this paragraph and choose the correct option from the provided answers:  planktonic counterparts. Overall, biofilms are very difficult to destroy because they are resistant to many common forms of sterilization.   Choices:  - vaccination  - termination  - assimilation  - sterilization   A:
sterilization
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Q: In which period of the periodic table is nickel found?   Read this paragraph and choose the correct option from the provided answers:  The period to which a given element belongs can easily be determined from its electron configuration. For example, consider the element nickel (Ni). Its electron configuration is [Ar]3 d 8 4 s 2 . The highest occupied principal energy level is the fourth, indicated by the 4 in the 4 s 2 portion of the configuration. Therefore, nickel can be found in the fourth period of the periodic table.   Choices:  - First Period  - Second Period  - Third Period  - fourth period   A:
fourth period
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Q: What does the clitellum secrete, while the sperm received are stored temporarily?   Read this paragraph and choose the correct option from the provided answers:     Choices:  - pathogen of mucus  - discharge of mucus  - amoeba of mucus  - cocoon of mucus   A:

cocoon of mucus
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