NTSE MCQs 1 on "Acids, Bases and Salts"

These are NTSE MCQs 1 of "Acids, Bases and Salts" . Practice MCQs to check your knowledge for Entrance examination like NTSE etc.

1. the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue.

• Acid
• Base
• Water
• All of the above

2. Acids react with metals to liberate _________gas

• Carbon dioxide
• Carbon monoxide
• Hydrogen
• Water

3. Acids react with metal carbonates to liberate ______ gas

• Carbon dioxide
• Carbon monoxide
• Hydrogen
• Water

4. Lime water turns milky when carbon dioxide is passed due to the formation of ______.

• CaCO₃
• CaO
• CO₂
• CaSO₄

5. The milkiness (on passing excess carbondioxide gas through lime water) disappears due to the formation of:

• Calcium carbonate CaCO₃
• Calcium hydrogen carbonate CaHCO₃
• Calcium oxide CaO
• Calcium Nitrate Ca(NO₃)₂

6. Acids react with bases to form salt and water. This reaction is known as:

• Combination
• Decomposition
• Neutralisation
• Reduction

7. A calcium compound reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Identify the compound and the gas evolved.

• Calcium Carbonate, Carbon dioxide
• Calcium chloride, carbondioxide
• Calcium oxide, hydrogen
• Calcium carbonate, hydrogen

8. How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

• Increases
• Decreases
• Remains the same
• Becomes zero

9. Why does dry HCl gas not change the colour of the dry litmus paper?

• Blue litmus becomes dry in presence of dry HCl gas
• No H₃O⁺ ions will be present, litmus changes colour only in the presence of H₃O⁺ ions
• HCl gas acts asa dehydrating agent d. None of the above

10. When a bee stings, immediately a paste of lime is put on the sting. Why?

• Bee sting is made of a base
• Bee sting contains an acid called formic acid. It gets neutralised with CaO
• Bee sting is acidic due to hydrochloric acid and this is neutralised
• All of the above.