Acid base and salt Objective and assertion and reason Question

1. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is:

a) Hydrochloric acid

b) Tartaric acid
c) Acetic acid d) Sulphuric acid.
2. Which of the following will turn phenolphthalein pink?
a) NaOH
b) HCl
c) CH₃COOH
d) H₂O
3. The compound formed during electrolysis of brine is:
a) Cl2
b) H2
c) NaOH
d) NaH
4. A teacher gave two test tubes – one containing water and the other containing sodium hydroxide solution to two students. Then he asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for correctly identifying the test tube containing the solution of sodium hydroxide?
a) Blue litmus
b) Red litmus
c) Sodium carbonate solution
d) Dilute HCl
5. To relieve pain caused due to acidity, we can take :
a) sour milk
b) lemon juice
c) orange juice
d) milk of magnesia
6. You are given four unknown solutions I, II, III, and IV. The pH values of these solutions are found to be 3, 7, 8, and 10 respectively. Among the given solutions, which solution has the highest hydrogen ion concentration?
a) I
b) II
 c) III
d) IV
7. Sodium chloride is a salt of :
 a) a weak acid and a weak base
 b) a strong acid and a strong base
 c) a weak acid and a strong base
 d) a strong acid and a weak base
8. Which of the following is a salt of a weak acid and a weak base?
a) NaCl
b) KNO₃
c) Na₂CO₃
d) (NH₄)₂CO₃

9. If there is a decrease in the concentration of H₃O ⁺ , what is the change in the pH of the solution?
a) No change
 b) Increase
 c) Decrease
d) may increase or decrease
10. Farmers use _____ for neutralization of acidic soil.
 a) CaSO₄.2H₂O
b) CaO
c) H₂CO₃
d) CH₃COOH

III. Read the assertion and reason statements carefully and mark the correct option out of the following options: a) If both assertion and reason are true and the reason is the correct explanation of the assertion. b) If both the assertion and reason are true but the reason is not the correct explanation of the assertion. c) If assertion is true but reason is false. d) If both assertion and reason are false.
 1. Assertion (A): Carbonic Acids is used in making soft drinks.
      Reason (R) : All mineral acids are corrosive.
 2. Assertion (A): Lime Juice has a sour taste, while lime water is slightly bitter.
      Reason (R) :The bitter taste of lime water is due to dilution.
3. Assertion (A): Antacids are used to get rid of pain caused by indigestion.
    Reason (R) :Antacids neturalise the excess acid produced in the stomach.
 4. Assertion (A): Tooth decay starts when the pH of the mouth is lower than 5.
    Reason (R) : Bee – Sting leaves an acid which causes pain and irritation.
5. Assertion (A): When pH of rain water is more than 7, it is called acid rain.
    Reason (R) : When electricity is passed through an aqueous solutions of sodium chloride, it decomposes to form sodium carbonate.