Acids Bases and Salts Questions and Answers with FREE PDF Download
1. Which of the following substance will not give carbon dioxide on treatment with dilute acid?
- Marble
- Limestone
- Baking soda
- Lime
Answer: Lime
2. Which one of the following can be used as an acid–base indicator by a visually impared student?
- Litmus
- Turmeric
- Vanilla essence
- Petunia leaves
Answer: Vanilla essence
3. The pH of the gastric juices released during digestion is
- less than 7
- more than 7
- equal to 7
- None of the above
Answer: less than 7
4. To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is
- acidic
- neutral
- basic
- None of the above
Answer: basic
5. One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is
- hydrochloric acid
- tartaric acid
- acetic acid
- All the above
Answer: tartaric acid
6. What happens to the smell of vanilla or onion in the presence of Acids?
- Smell increases
- Smell vanishes
- No change
- A small increase in smell
Answer: A small increase in smell
7. 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount HCl solution (the same solution as before) required to neutralise it will be
- 4 mL
- 8 mL
- 12 mL
- 16 mL
Answer: 16 mL
8. A solution turns red litmus blue, its pH is likely to be
- 1
- 4
- 5
- 10
Answer: 10
9. Which sodium compound is used for softening hard water?
- Na2CO3
- NaHCO3
- NaCl
- All of the above
Answer: Na2CO3
10. The common name of CaOCl2 is
- Bleaching powder
- Common Salt
- Plaster of Paris
- Gypsum
Answer: Bleaching powder
11. Which is known as carbolic acid?
- Phenol
- Ethanol
- Acetic acid
- Oxalic acid
Answer: Phenol
12. Name an element which is common to all acids?
- Sulphur
- Chlorine
- Nitrogen
- Hydrogen
Answer: Hydrogen
13. On a pH scale, we can measure pH from
- 0-7
- 7-14
- 0-14
- None of the above
Answer: 0-14
14. What happens when an acid reacts with metal oxide?
- Salt and water is formed
- Metal hydride is formed
- Oxyacid will be formed
- None of the above
Answer: Salt and water is formed
15. Which statement is correct regarding acids? I. Acid is a molecule which donates a proton or accepts electron pair in reactions. II. Acid increases the concentration of hydrogen atoms or hydronium atoms in water. III. Acids have a pH value of less than 7. IV. The acid in the stomach helps in the digestion of food.
- Only I
- Both II and IV
- I, III and IV
- All the above
Answer: All the above
16. Which of the following is a battery acid?
- Sulphuric acid diluted with water
- Carboxylic acid mixed with water
- Concentrated hydrochloric acid
- Concentrated sulphuric acid
Answer: Sulphuric acid diluted with water
17. Red litmus paper turns into which colour in basic/alkaline conditions?
- Violet colour
- Red colour
- Blue colour
- No change
Answer: Blue colour
18. Which acid is present in sour milk?
- Ascorbic acid
- Ethanoic acid
- Tartaric acid
- Lactic acid
Answer: Lactic acid
19. Which of the following is present in Bee sting?
- Tartaric acid
- Methanoic acid
- Citric acid
- All of the above
Answer: Methanoic acid
20. Which of the following is true about Alkalis?
- Bases which are soluble in water are called alkalis
- Bases which are soluble in acids are called alkalis
- Bases which are soluble in other bases are called alkalis
- Bases which are harsh to touch, sour in taste are called alkalis
Answer: Bases which are soluble in water are called alkalis
21. NaCl (common salt) which we use in food is
- Neutral
- Acidic
- Basic
- All of the above
Answer: Neutral
22. The chemical formula of Gypsum is
- CaSO4.2H2O
- CuSO4.5H2O
- CoCl4.6H2O
- SnCl2.2H2O
Answer: CaSO4.2H2O
23. The water of crystallisation is the fixed number of
- water molecules present in one formula unit of a salt
- sodium molecules present in one mass unit of a salt
- water molecules present in one mass unit of a salt
- sodium molecules present in one formula unit of a salt
Answer: water molecules present in one formula unit of a salt
24. Why is calcium sulphate hemihydrates called Plaster of Paris?
- Because it is found only in Paris
- Because of its colour which is quite similar to that of Paris
- Because of its large deposits in the Paris
- Because its first usage began in Paris
Answer: Because of its large deposits in the Paris
25. Name the substance which on treatment with chlorine yields bleaching powder.
- Calcium hydroxide
- Calcium carbonate
- Calcium oxide
- Calcium chloride
Answer: Calcium hydroxide
26. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains
- NaCl
- HCl
- LiCl
- KCl
Answer: HCl
27. Which one of the following types of medicines are used for treating indigestion?
- Antibiotic
- Analgesic
- Antacid
- Antiseptic
Answer: Antacid
28. In the presence of normal acids, Phenolphthalein colour remains
- Pink
- Colourless
- Orange
- None of the above
Answer: Colourless
29. Ant sting produces
- Acetic acid
- Methanoic acid
- Oxalic acid
- Butanoic acid
Answer: Methanoic acid
30. Which of the following is acidic in nature?
- Lime juice
- Human blood
- Lime water
- Antacid
Answer: Lime juice
31. Which of the following is usually taken to counter constipation?
- Hydrochloric acid
- Milk of magnesia
- Ascorbic acid
- None of the above
Answer: Milk of magnesia
32. Tooth enamel is made up of which of the following?
- Potassium carbonate
- Calcium carbonate
- Calcium phosphate
- None of the above
Answer: Calcium phosphate
33. A metal compound reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. If one of the compounds formed is calcium chloride. Then, what’s the name of the metal compound?
- Calcium carbonate
- Calcium chloride
- Calcium hydroxide
- None of the above
Answer: Calcium carbonate
34. While mixing a strong concentrated acid/base, we must take care of which of the following? 1. The acid/base must always be added slowly to water rather than the other way around. 2. We must stir the solution slowly and constantly. 3. Protective goggles, gloves, and a lab coat should be worn. 4. The water must always be added to the acid/base rather than the other way around.
- Only 1 and 3 are correct
- Only 1, 2 and 3 are correct
- Only 2, 3 and 4 are correct
- None of the above
Answer: Only 1, 2 and 3 are correct
35. Which gas is usually liberated when an acid reacts with a metal?
- Hydrogen
- Oxygen
- Nitrogen
- All the above
Answer: Hydrogen
36. Copper chloride is a light brown solid, which slowly absorbs moisture to form a
- Orange dihydrate
- Red dihydrate
- Blue-green dihydrate
- Blue dihydrate
Answer: Blue-green dihydrate
37. Hydrogen burns with a pop sound in the presence of
- Nitrogen
- Oxygen
- Sulphur dioxide
- Argon
Answer: Oxygen
38. Metal oxides are also called
- Basic oxides
- Acidic Oxides
- Neutral Oxides
- None of the above
Answer: Basic oxides
39. Which of the following do not conduct electricity?
1. Ethyl alcohol 2. Glucose 3. Water
- Only 1
- Only 3
- Both 1 and 2
- All 1, 2 and 3
Answer: All 1, 2 and 3
40. Common salt besides being used in kitchen can also be used as the raw material for making i. soda ii. bleaching powder iii. baking soda iv. slaked lime
- (i) and (ii)
- (i), (ii) and (iv)
- (i) and (iii)
- (i), (iii) and (iv)
Answer: (i) and (iii)
41. The chemical formula of Plaster of Paris is
- CaSO4.2H2O
- CuSO4.5H2O
- CaSO4.1/2H2O
- All of the above
Answer: CaSO4.1/2H2O
42. Large crystals of raw salt from the deposits of solid salts are of which colour, in general?
- Black
- Brown
- White
- Green
Answer: Brown
43. Salts of a strong acid and weak base are
- Neutral
- Acidic
- Basic
- Both B and C
Answer: Acidic
44. The hardest substance in the human body is
- Tooth Enamel
- Femur
- Temporal bone
- None of the above
Answer: Tooth Enamel
45. Why does dry HCl gas not change the colour of the dry litmus paper?
- Because dry litmus paper is not an indicator
- Because HCl gas is a weak acid, we must use a strong acid
- Because dry HCl gas does not ionize to produce H+ ions
- None of the above
Answer: Because dry HCl gas does not ionize to produce H+ ions
46. Dilution is the process of
- Mixing acid with water
- Mixing strong acid with a strong base
- Mixing acid or base with water
- Mixing strong acid with a weak base
Answer: HClMixing acid or base with water
47. What are Olfactory Indicators?
- Substances whose colour changes in acidic or basic media
- A pH indicator made of a solution of several compounds
- A man-made chemical substance that can be used as acid-base indicators
- Substances whose odour changes in acidic or basic media
Answer: Substances whose odour changes in acidic or basic media
48. Blue litmus paper turns into which colour in basic conditions?
- Violet colour
- Red colour
- Blue colour
- No change
Answer: No change
49. Which of the following is the milk of magnesia?
- Ammonium hydroxide (NH4OH)
- Sodium hydroxide (NaOH)
- Magnesium hydroxide (Mg(OH)2)
- Potassium hydroxide (KOH)
Answer: Magnesium hydroxide (Mg(OH)2)
50. When acids are dissolved in water they produce ions which help in conducting the electricity. This process is known as
- Galvanization
- Vulcanisation
- Dissociation
- None of the above
Answer: Dissociation
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