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  1. In order to balance this, you have to count each element where the elements in the reactants side and the product side should have equal number of molecules. The balanced reaction is as follows:

    2HCl + Ca(OH)2 = CaCl2 + 2H2O

  2. The correct answer is Option D.

    Explanation:

    Ionic compounds are defined as the compounds which are formed by the complete transfer of electrons from one atom to another atom. In these compounds, oppositely charged ions are attracted towards each other to form a compound.

    Hydrogen is the 1st element of the periodic table having 1 electron. The electronic configuration of this element is [tex]1s^1[/tex]

    This will loose 1 electron to form [tex]H^+[/tex] ion.

    Chlorine is the 17th element of the periodic table having 17 electrons. The electronic configuration of this element is [tex]1s^22s^22p^63s^23p^5[/tex]

    This will gain 1 electron to form [tex]Cl^{-}[/tex] ion.

    To form HCl compound, 1 hydrogen ion is needed to neutralize the charge on chlorine ion.

    Hence, the correct answer is Option D.

  3. I suppose the answer here is B because it brings out the actual process that enables conductivity in the Sodium Chloride solution NaCl(aq)

  4. A. The NaCl dissociates into Na+ and Cl- ions, which are able to carry the charge.

    Explanation:

    This is because when dissolved in water (in aqueous form) ions can move freely and thus they can conduct electricity well. Water by itself is a poor conductor of electricity because it is neutral and therefore does not have the negative and positive charged required to conduct electricity.

  5. Option (B) is the correct answer.

    Explanation:

    NaCl is a polar compound as it contains an ionic bond between sodium atom and chlorine atom.

    Also, it is known that like dissolves like. So, when we add NaCl in water then sodium chloride will dissociate into ions as it will form [tex]Na^{+}[/tex] ions and [tex]Cl^{-}[/tex] ions.

    These ions will help in the flow of electrons when electric current is passed through a solution of NaCl.

    Thus, we can conclude that the statement, the NaCl dissociates into [tex]Na^{+}[/tex] and [tex]Cl^{-}[/tex] ions, which are able to carry the charge.

  6. Hydrogen chloride may be formed by the direct combination of chlorine (Cl2) gas and hydrogen (H2) gas; the reaction is rapid at temperatures above 250° C (482° F). The reaction, represented by the equation H2 + Cl2 → 2HCl, is accompanied by evolution of heat and appears to be accelerated by moisture.

    Hoped it helped!

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