Answer:
(a) Potassium 3; phosphorus 1; oxygen 4
(b) Aluminium 3; oxygen 9; hydrogen 9
(c) Iron 10; sulfur 15; oxygen 60
Explanation:
(a) K₃PO₄
In one formula unit of K₃PO₄ , there are three atoms of potassium (K), one atom of phosphorus (P), and four atoms of oxygen (O).
In two formula units there are
Potassium — six atoms
Phosphorus — two atoms
Oxygen — eight atoms
(b) Al(OH)₃
In one formula unit of Al(OH)₃, there is one atom of aluminium (Al), three atoms of O, and three atoms of Hydrogen (H).
In three formula units there are
Aluminium — three atoms
Oxygen — nine atoms
Hydrogen — nine atoms
(c) Fe₂(SO₄)₃
In one formula unit of Fe₂(SO₄)₃, there are two atoms of iron (Fe), three atoms of sulfur (S), and 12 atoms of O.
In five formula units there are
Iron — 10 atoms
Sulfur — 15 atoms
Oxygen — 60 atoms
Omitted options and they are
a) pure compound.
b. pure element.
c. pure substance.
d. homogeneous solution.
e. heterogeneous solution
Answer:d. homogeneous solution.
Explanation:
Pure substances or elements or compounds have a definite and sharp melting or boiling point, Any substance that is not pure is impure and will have different temperature of melting or boiling points.
To this effect, the clear colorless liquid cannot be a Pure substance, element or compound.
We can therefore say that the clear colorless liquid would be a homogeneous solution because a homogeneous solution is a mixture of constituents which completely mixes together such that each constituents cannot be seen with naked eye, When heated to boiling, each constituent in the mixture will give different boiling points.
A heterogeneous Solution, too is a mixture but contains constituents that can be seen and not a clear colourless solution.
Therefore On the basis of this information, we can say that the material in the beaker was a Homogeneous solution
The balanced molecular equation , with Na⁺ as the spectator ion .
2NaCrO₂(aq) + 2H₂O(l) + 6NaClO(aq) →2
CrO₄(aq) + 3Cl₂(g) + 4NaOH(aq)
There are following steps involve in balanced redox reaction in basic medium .
- Divide the reaction into two half reactions .
- Balance the elements other than oxygen and hydrogen .
- Balance the oxygen atom by adding
.
- Balance the hydrogen atom by adding
. - Add
on bath side . - Combine and to form form .
- Balance the charge by adding
.
- Add the half reaction and simply .
The species which reduces the other species in the redox reaction is called oxidizing agent . Similarly , the species which oxidize the other species in the redox reaction is called reducing agent .
To learn more about balanced redox reaction please click here ,
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First, we have to start balancing the equation:
H2O2 + FeSO4 + H2SO4 → Fe2(SO4)3 + H2O
we can see that the number of H atoms on the left side is 4 and on the right side is 2 so we have to make the number of H atoms are equal on both sides
so, we will put 2H2O instead of H2O
H2O2 + FeSO4 + H2SO4 → Fe2(SO4)3 + 2H2O
we can see that number of O on the left side is 10 and on the right side 14
so we will put 2 FeSO4 instead of FeSO4
H2O2 + 2FeSO4 + H2SO4 → →Fe2(SO4)3 + 2H2O
∴ the coefficients of the reactants and products will be in order 1 2 1 1 2
