Acids and Bases (Grade 9)
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Acids and Bases
1.
Which of the following sets of acids form the primary component of acid rain?
- Carbonic acid, Sulfuric acid, Nitric acid
- Sulfuric acid, Phosphoric acid, Boric acid
- Carbonic acid, Hydrochloric acid, Acetic acid
- Nitric acid, Perchloric acid, Hydrofluoric acid
2.
According to the Arrhenius theory, a hydronium ion is produced when an acid is dissolved in water.
- True
- False
3.
What can you say about pH of salt solutions?
- The pH of salt solutions is perfectly basic with pH < 7.
- The pH of salt solutions is not perfectly neutral with pH = 7.
- The pH of salt solutions is strongly alkaline with pH > 7.
- The pH of most salt solutions is strongly acidic with pH < 7.
4.
Which of the following theories defines acid as a species that forms hydronium ion in water?
- Arrhenius theory
- Lewis acid-base theory
- Lowry-Bronsted theory
5.
[math]BF_3[/math] is a Lewis acid because the central atom is capable of accepting a pair of .
6.
Sugar solution does not change the color of both blue and red litmus paper. Therefore, sugar solution is .
- acidic
- basic
- alkaline
- neutral
7.
Which of the following compounds is an example of Lewis base?
- [math]BF_3[/math]
- [math]AlCl_3[/math]
- [math]SiF_4[/math]
- [math]C_6H_5N[/math]
8.
Which of the following pair of chemical species constitute the buffer system of human blood?
- [math]H_2CO_3, HCO_3^-[/math]
- [math]H_2PO_4^-, HPO_4^(2-)[/math]
- [math]NH_3, NH_4^+[/math]
- [math]HSO_3^+ , SO_3^(2-)[/math]
9.
When red litmus paper is dipped in ammonia, the litmus paper turns blue, thereby indicating that ammonia is .
10.
Which of the following non-metal oxides react with each other during acid rain?
- [math]SO_2, PO_4, Al_2O_3[/math]
- [math]SO_2, NO_2, CO_2[/math]
- [math]SO_2, SiO_2, CO_2[/math]
- [math]SO_2, NO_2, PO_4[/math]
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