1. Write the symbol for zinc. How many protons and electrons are there in the at

Question

1. Write the symbol for zinc. How many protons and electrons are there in the atom of zinc? Give the highest possible and lowest possible oxidation state for zinc. Determine the molar mass of Na2 [Zn(OH)4] and the oxidation state of zinc in it. Write the oxide formula of zinc for the corresponding oxidation state. Predict the chemical properties (neutral, acidic, basic, or amphoteric) of Hg2O, ZnO, and SO3 basic aunph 2. Write balanced molecular, complete ionic and net ionic equations for reaction: KOH(aq)+ NH Cla) 3. Name these compounds: Fe(OH)2; H2S; K2SO;.

Explanation / Answer

1)

The symbol of Zinc= Zn

atomic number of Zn = 30

So it contians 30 protons and 30 electons.

The highest oxidation state of Zn= +2. and lowest state is 0(zero)

Na2[Zn(OH)4]

atomic mass of Na= 23.0gram/mole

atomic mass of Zn =65.38 gram/mole

atomic mass of O= 16.0 gram/mole

atomic mass of H = 1.008gram/mole

So molar mass of Na2[Zn(OH)4] = 2x23 +65.38+ 4x16.0+4x1.008 =179.412 gram/mole

oxidation state of Zn=

2(+1) + x+4(-1)=0

x=+2

oxidation state of Zn= +2

the formula of Zinc oxide = ZnO, inthis compound the state of Zn is +2

metallic oxide are basic in nature and nonmetallic oxides are acidic nature

Hg2O and ZnO are basic in nature

So3 is nonmetallic oxide so it is acidic oxide.

2)

KOH(aq) + NH4Cl(aq) --------------- NH4OH(aq) + KCl(aq)

K+(aq) + OH-(aq) + NH4+(aq) + Cl-(aq) --------------- NH4OH(aq) + K+(aq) + Cl-(aq)

NH4+(aq) + OH-(aq) ------------------ NH4OH(aq)

3)

Fe(OH)2 ----------------- Iron(II) hydroxide

H2S------------------ dihydrogen sulfide or hydrogen sulfide

K2SO3--------------- Potassium sulfite.

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