Acids, Bases and Salts
Covers properties, reactions, and applications of acids, bases, and salts including pH indicators, neutralization, and common compounds
Questions
Which of the following statements is/are false?
a. An alkali turns red litmus to blue.
b. Methyl orange indicator gives yellow colour in basic solution.
c. Phenolphthalein is pink in colour in an acid solution.
- Only a
- Both a and b
- Only b
- Both b and c
- Only c
_______________ is used in the manufacture of plastics, paints and dyes.
- Sulphuric acid
- Hydrochloric acid
- Acetic acid
- Tartaric acid
- Carbonic acid
Weak acids have low electrical conductivity. Which of the following is a weak acid?
- Sulphurous acid
- Sulphuric acid
- Hydrochloric acid
- Nitric acid
- None of these
Acids are stored in containers made of glass and ceramics because containers made of glass and ceramics
- are not attacked by bases
- are not attacked by acids
- do not corrode
- protects acids from moisture
- are very durable
Which of the following acids is used for removing oxide film from steel objects?
- Sulphuric acid
- Hydrochloric acid
- Acetic acid
- Nitric acid
- Carbonic acid
Which of the following is not a property of a base?
- Bases have bitter taste.
- Bases feel soapy to touch.
- Bases turn red litmus to blue.
- Bases react with some metals to form hydrogen gas.
- Bases react with metal oxides to form salt and water.
Egg shells are made up of which of the following compounds?
- Sodium chloride
- Sodium carbonate
- Sodium hydroxide
- Calcium carbonate
- Calcium hydroxide
Most of the bases do not dissolve in water, but some do. Which of the following bases dissolve in water?
- Na2CO3
- NaHCO3
- Mg(OH)2
- CaO
- CaCO3
Which of the following solutions will have a pH of exactly 7?
- Hydrochloric acid
- Sodium chloride
- Magnesium hydroxide
- Acetic acid
- Sodium hydroxide
Which of the following acid is naturally produced in a human's stomach?
- Sulphuric acid
- Tartaric acid
- Citric acid
- Hydrochloric acid
- Formic acid
Which of the following statements is/are false?
a. Solutions having pH lesser than 7 are acidic in nature and will turn methyl orange indicator red.
b. Both acidic and basic solutions contain hydrogen ions.
c. Substances having pH of more than 7 will turn phenolphthalein indicator blue.
- Only a
- Both a and b
- Only b
- Both b and c
- Only c
If the soil in a field is having low pH, then it can be treated with which of the following?
a. Calcium oxide
b. Calcium carbonate
c. Sodium chloride
- Only a
- Both a and b
- Only c
- Both a and c
- Both b and c
Which of the following salts will give a neutral solution?
- Ammonium chloride
- Potassium sulphate
- Ammonium sulphate
- Sodium carbonate
- Sodium acetate
Sodium hydroxide is obtained by the electrolysis of sodium chloride solution. Which of the following is not a use of sodium hydroxide?
- Sodium hydroxide is used for making soaps and detergents.
- Sodium hydroxide is used for making artificial textile fibre.
- Sodium hydroxide is used in the manufacturing of paper.
- Sodium hydroxide is used in purifying bauxite ore.
- Sodium hydroxide is used for making solvents for drycleaning.
Which of the following is used to remove the permanent hardness of water?
- Sodium carbonate
- Sodium hydroxide
- Sodium hydrogencarbonate
- Sodium chloride
- Sodium acetate
Which of the following is also called as the chloride of lime?
- Baking soda
- Baking powder
- Bleaching powder
- Plaster of Paris
- Caustic soda
Organic acids are the naturally occurring acids. Which of the following is not an organic acid?
- Acetic acid
- Citric acid
- Lactic acid
- Tartaric acid
- Nitric acid
Match the following:
| Salts | Formula |
| a. Calcium chloride | 1. CaCO3 |
| b. Calcium sulphate | 2. CaCl2 |
| c. Calcium carbonate | 3. CaSO4 |
- a - 1, b - 3, c - 2
- a - 2, b - 3, c - 1
- a - 3, b - 2, c - 1
- a - 1, b - 2, c - 3
- a - 2, b - 1, c - 3
Which of the following is used in chemistry laboratories for sealing air-gaps in apparatus where air-tight arrangement is required?
- Plaster of Paris
- Bleaching powder
- Baking soda
- Washing soda
- Caustic soda
The presence of which of the following ions gives an acid solution its acidic properties?
- Sulphur ions
- Potassium ions
- Hydrogen ions
- Copper ions
- Magnesium ions
Match the following:
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| Acids | Sources |
| a. Acetic acid | 1. Orange |
| b. Citric acid | 2. Curd |
| c. Lactic acid | 3. Vinegar |
- a - 3, b - 1, c - 2
- a - 3, b - 2, c - 1
- a - 1, b - 2, c - 3
- a - 1, b - 3, c - 2
- a - 2, b - 1, c - 3