11. Acids and Bases

1.  Reaction with which substance leads to the formation of white solid around stoppers of sodium hydroxide solution?

2. Propanoic acid, Ethanoic acid, Nitric Acid, and Sulphuric acid each dissociate in solution. If the universal indicator is placed in 0.5 mol/dm³ solution of each electrolyte, which solution will produce a color corresponding to the lowest pH?

3. Excess of hydrochloric acid is added to Tu aqueous sodium hydroxide which graph shows the change in the pH?

4. Which two gases change the color of damp red litmus paper?

5. Which atmospheric pollutant gas cannot be removed by powdered calcium carbonate?

6. Hydrazine has similar properties to ammonia. what is the property?

7. Why Aluminium oxide oxidized on the surface of aluminum saucepans removed by both acids and bases?

8. Which chemical can help in determining whether an unlabeled bottle contains aqueous sodium carbonate or aqueous ammonium carbonate?

9. Solid S on heating gives off a gas, which on passing through lime water, forms a white precipitate. The residue after heating solid S reacts with dilute acid as well as aqueous alkali. What is S?

10. How many different chlorides in the total cloud are prepared by the reaction of dilute hydrochloric acid with the following substances? A. Copper B. Calcium C. Gold D. Calcium Carbonate

11. what is gas X in the below diagram?

12. Element E burns in air to give a product which dissolve in water to produce an alkaline solution. what is element E? A. Carbon B. Sulphur C. Sodium D. Iron

13. An aqueous solution of pH 2 will have what concentration of ions?    

	The concentration of H+ Ions	The concentration of OH- Ions
A	High	None
B	High	Low
C	Low	Low
D	Low	High

14. Element E reacts with oxygen to form a gas that changes damp blue litmus to Red. This gas can also kill bacteria. What is element E?

15. What will be there in a dilute aqueous solution of strong acid, HX, along with water molecules, H+ ions, and X- ions?

16. The oxide of three elements, T, U, and V are added to the water.  

	Oxide of T	Oxide of U	Oxide of V
Water Added	Dissolved to form a solution of pH 2	Insoluble	Dissolved to form a solution of pH 10

17. The pH value of 0.1 mol/dm3 solution of nitric acid is one where is pH value of 0.1 mol/dm3 solution of ethanoic acid is 3.7, Why?

18. The dissociation constant for n acid indicates the extent to which it dissolves into irons. The higher of dissociation constant, the stronger the acid. The dissociation constant for some acids is given below along with two possible correct statements.     Statement 1: Increasing the length of the carbon chain makes the acid stronger. Statement 2: Replacing the hydrogen by a chlorine in ethanoic acid makes the acid stronger.

19. What does the term strong acid main in relation to nitric acid?

20. Which row matches correctly with the characteristic of gases?  

		CO2	NO2	SO2	SiO2
A	Are Acidic	✓	x	x	✓
B	Are solids at room temperature	x	x	x	✓
C	May be present in the air	✓	x	✓	x
D	React with acidified potassium manganate (VII)	x	x	✓	✓

21. The following reactions are carried out.

Reaction	Result
Ethanoic acid is added to ammonium carbonate	Gas E given off
Ammonium ethanoate is warmed with sodium hydroxide solution	Gas F given off
Ethanoic acid is added to an  aqueous solution of ammonia	Compound G formed

What are E, F, and G?  

	Gas E	Gas F	Compound G
A	Ammonia	Carbon dioxide	Ammonium Carbonate
B	Ammonia	Carbon dioxide	Ammonium Ethanoate
C	Carbon dioxide	Ammonia	Ammonium Carbonate
D	Carbon dioxide	Ammonia	Ammonium Ethanoate