
(a)
Interpretation:
The balanced equation for the given reaction should be given.
Concept introduction:
The reduction and oxidation reactions are occur simultaneously with in a single reaction is known as redox reaction.
The unbalanced charge (electron) and atoms (ions) in the equation of redox reactions are commonly balanced by half reaction method.
In this method, the given redox reaction is separated by two half reactions, one is oxidation and another one is reduction.
The medium of the reaction is used to balance the Hydrogen and Oxygen ions in the half cell reactions.
Balancing of redox reaction in acid medium:
In the acid medium, the addition of
Charge is balanced by addition of electron in the sides with the greater positive charge.
Balancing of redox reaction in basic medium:
In the basic medium, the addition of
(b)
Interpretation:
The number of moles of oxide were formed, and number of moles of semimetal were in the initial
Concept Introduction:
Precipitation reaction:
If precipitate is formed, when two soluble salt solutions are combined together is known as precipitation reaction.
Mole:
Mole of the compound present in the solution is calculated by molarity concentration of the compound multiplied with litre volume of solution.
Mass:
Mass of the compound is calculated by mole of the compound is multiplied with molar mass of the compound.
Mass percent:
The mass percent of analyte in give sample is given by below equation,
(c)
Interpretation:
The semimetal should be determined.
Concept Introduction:
Precipitation reaction:
If precipitate is formed, when two soluble salt solutions are combined together is known as precipitation reaction.
Mole:
Mole of the compound present in the solution is calculated by molarity concentration of the compound multiplied with litre volume of solution.
Mass:
Mass of the compound is calculated by mole of the compound is multiplied with molar mass of the compound.
Mass percent:
The mass percent of analyte in give sample is given by below equation,

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Chapter 7 Solutions
General Chemistry: Atoms First
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