Chemistry 9, Unit 10 Acids, Base and Salts, Full Exercise, National Book Foundation, FBISE

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Chemistry 9, Unit 10 Acids, Base and Salts, Full Exercise, National Book Foundation, FBISE
Question 02. Give short answer.

Q. i. Write the equation for the self-ionization of water.
Answer:



Q. ii. Define and give examples of Arrhenius acids.
Answer:



Q. iii. Why HCI acts as a strong acid?
Answer:



Q. iv. Why NH3 acts as Bronsted-Lowry base.
Answer:
Q. v. Why ammonia acts as a weak base.


Question 03. Ammonium hydroxide and nitric acid react and produce ammonium nitrate and water. Write balanced chemical equation for this neutralization reaction.
Answer:





Question 04. Write balanced chemical equations for the following chemical reactions.
i. Sulphuric acid + Magnesium hydroxide → magnesium + water.
ii. Sulphuric acid + Sodium Carbonate → Sodium sulphhate + water.
iii. Hydrochloric acid + Magnesium → Magnesoum chloride + water.
Answer:







Question 05. Identify Bronsted –Lowry acids or bases in the following reactions.
i. HNO3 + H2O → H3O+ + NO3−
ii. NH3 + HNO3 → NH4NO3
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Question 06. Give the Bronsted-Lowry definition of an acid. Write an equation that illustrates the definition.
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Question 07. Identify Bronsted acids and Bronsted bases in the following reactions.
i. CH3COOH(aq) + H2O ⇌ CH3COO−(aq) + H3O+(aq)
ii. HCO−3(g) + H2O(l) ⇌ CO−23(aq) + H3O+(aq)
iii. NH3(g) + H2O(I) ⇌ NH+4(aq) + OH−(aq)
iv. HCI(aq) + HCO−3(aq) ⇌ H2CO3(aq) + CI−(aq)
v. HS−(aq) + H2O(I) ⇌ S−2(aq) + H3O+(aq)
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Question 08. Write equations showing the ionization of the following as Arrhenius acids.
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Question 09. Write equations showing the ionization of the following as Arrhenius acids.
a. HI(aq)
b. HNO2(aq)
Answer:




THINK TANK


Question 10. Compare the relative concentrations of hydrogen ions and hydroxide ions in each kind of solutions?
a. acidic
b. basic
c. neutral

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