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The strength of acids and bases depends on the number of \(H^+\) ions and \(OH^-\) ions produced, respectively. If we take hydrochloric acid and acetic acid of the same concentration, say one molar, then these produce different amounts of hydrogen ions. Acids that give rise to more \(H^+\) ions are said to be strong acids, and acids that give less \(H^+\) ions are said to be weak acids.

1. True or false. The acids that give rise to more \(OH^+\) are called strong acids as well as strong bases.

(i) TRUE

(ii) FALSE

2. Which of the following is the strong acid?

(i) Acetic acid

(ii) Formic acid

(iii) Hydrochloric acid

(iv) None of these

3. Does \(OH^-\) and \(H^+\) ions determine the strength of an acid or a base?

(i) YES

(ii) NO

(iii) MAYBE

4. Which one is correctly matched about acids?

 (i)  Acid- pH above 7

(ii)  Acid- pH below 7

(iii)  Acid- pH equal to 7

(iv) None of these

5. Which of the following is neither an acid nor base ?

(i) \(CH_3COOH\)

(ii) \(H_2SO_4\)

(iii) KCl

(iv) NaOH

6. Ashok had set the apparatus as shown in the above figure. He took about 5 mL of dilute sulphuric acid in a test tube and added a few pieces of zinc granules to it. He then passed the gas being evolved through the soap solution. Ne then take a burning candle near a gas filled bubble.

7. The zinc metal in the above reactions displaces hydrogen atoms from the acids as hydrogen gas and forms a compound called as ____.

(i) Salt

(ii) Metal

(iii) Base

(iv) None of these

8. The above experiment by Ashok was done to test which gas?

(i) Hydrogen gas

(ii)Oxygen gas

(iii) Nitrogen gas

(iv) Chlorine gas

9. Which of the following is the reaction of a metal with an acid?

(i) Base + Metal \(\longrightarrow\)Salt + Hydrogen gas

(ii)  Acid + Metal \(\longrightarrow\) Salt + Oxygen gas

(iii) Acid + Metal \(\longrightarrow\) Salt + Hydrogen gas

(iv) None of these

10. What will happen if copper turning is taken in place of zinc granules?

 (i) The reaction will speed up

(ii) The rate of hydogen gas formation is decreased

(iii) No reaction will take place

(iv) None of these

11. Zinc chloride and hydrogen gas are formed, when zinc granules are treated with ____

(i) Sulphuric acid

(ii) Hydrochloric acid

(iii) Nitric acid

(iv) Acetic acid

1 Answer

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Best answer

1.(ii) FALSE

2. (iii) Hydrochloric acid

3. (i) YES

4. (ii) Acid- pH below 7

5. (iii) KCl

6. (0)undefined

7. (i) Salt

8. (i) Hydrogen gas

9. (iii) Acid + Metal \(\longrightarrow\) Salt + Hydrogen gas

10. (iii) No reaction will take place

11. (ii) Hydrochloric acid

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