Properties of acids and bases Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following statements correctly describes the effect of an acidic aqueous solution on litmus indicator paper?

   • A) It turns red litmus paper blue while leaving blue litmus paper unchanged.
   • B) It turns blue litmus paper red while leaving red litmus paper unchanged.
   • C) It turns both red and blue litmus papers colorless.
   • D) It turns both red and blue litmus papers yellow.
2. 2.

   Which gas is evolved when dilute hydrochloric acid reacts with solid calcium carbonate?

   • A) Carbon dioxide
   • B) Hydrogen
   • C) Oxygen
   • D) Chlorine
3. 3.

   Which of the following properties is shared by both aqueous acids and aqueous bases?

   • A) They conduct an electric current due to the presence of mobile ions.
   • B) They turn red litmus paper blue upon contact.
   • C) They feel slippery or soapy when touched.
   • D) They have a pH value greater than 7 at 25 °C.
4. 4.

   Which gas is released when a piece of magnesium ribbon reacts with a dilute aqueous solution of hydrochloric acid?

   • A) Chlorine gas ($\text{Cl}_2$)
   • B) Hydrogen gas ($\text{H}_2$)
   • C) Oxygen gas ($\text{O}_2$)
   • D) Carbon dioxide gas ($\text{CO}_2$)
5. 5.

   Which of the following statements correctly describes a characteristic property of aqueous bases?

   • A) They react readily with active metals such as magnesium to liberate hydrogen gas.
   • B) They feel slippery to the touch and turn red litmus paper blue.
   • C) They possess a distinctly sour taste and exhibit a pH below 7 at 25 °C.
   • D) They release hydronium ions as the primary cation upon dissolving in water.