An acid has the formula HX. The name of the acid ends in -ous. Which could be the identity of X? A.)SO3

B.)NO3

C.)NO2

D.)SO4

Explanation:

Polyions used in acid nomenclature can be confusing, but there is order in the kaos.

To understand this, one need be able to assign oxidation states to the non-oxy element in the polyion given followed by the -ous or -ic acid. That is, ...

                  oxidation              name of             name of  

                 state of N               polyion                acid

-NO₂⁻               +3                    nitrite ion           Nitrous Acid

-NO₃⁻               +5                    nitrate ion           Nitric Acid

                  oxidation              name of             name of

                 state of S               polyion                   acid

-SO₃²⁻              +4                  sulfite ion           Sulfurous Acid

-SO₄²⁻              +6                  sulfate ion          Sulfuric Acid

Other ions follow the same assignment trends with the non-oxy element oxidation state governing the nomenclature.

                  oxidation              name of                    name of  

                 state of Cl              polyion                        acid

-ClO⁻  =>         +1                hypochlorous ion     Hypochlorous Acid

-ClO₂⁻ =>        +3                    chlorous ion          Chlorous  Acid

-ClO₃⁻ =>        +5                    chlorite ion              Chloric Acid

-ClO₄⁻ =>        +7                   perchloric ion          Perchloric Acid

                  oxidation              name of                    name of  

                 state of Br              polyion                        acid

-BrO⁻  =>         +1                hypobromous ion     Hypochlorous Acid

-BrO₂⁻ =>        +3                    bromous ion          Chlorous  Acid

-BrO₃⁻ =>        +5                    bromite ion              Chloric Acid

-BrO₄⁻ =>        +7                   perbromic ion          Perchloric Acid

HC₂H₃O₂ => -C₂H₃O₂ => acetate ion => acetic acid

HC₂O₄     => - C₂O₄    =>  oxalate ion => oxalic acid

HMnO₄   =>  - MnO₄   => permanganate ion => permanganic acid

In summary ...

-ite ending => -ous acid

-ate ending => - ic acid

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-