The oxides CaO, CO2, Na2O and N2O4 are placed in water to form four separate solutions - HSC - SSCE Chemistry - Question 5 - 2015 - Paper 1
Question 5
The oxides CaO, CO2, Na2O and N2O4 are placed in water to form four separate solutions.
Which row of the table correctly indicates the solutions with pH less than 7... show full transcript
Worked Solution & Example Answer:The oxides CaO, CO2, Na2O and N2O4 are placed in water to form four separate solutions - HSC - SSCE Chemistry - Question 5 - 2015 - Paper 1
Step 1
Identify oxides that produce acids in water
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Answer
Carbon dioxide (CO2) and dinitrogen tetroxide (N2O4) produce acidic solutions when they dissolve in water, lowering the pH below 7.
Step 2
Identify oxides that produce bases in water
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Answer
Calcium oxide (CaO) and sodium oxide (Na2O) produce basic solutions in water, which increase the pH above 7.
Step 3
Label the solutions correctly
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Answer
Thus, the table will be:
pH less than 7
pH greater than 7
CO2
CaO
N2O4
Na2O
Step 4
Select the correct option
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Answer
The correct option that corresponds to this arrangement is (A).
