Acids Bases and Salts Quiz | Acids Bases and Salts Objective Type Questions and Answers

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Questions
21 Which of the following substance will not give carbon dioxide on treatment with dilute acid?
A Marble
B Limestone
C Baking soda
D Lime

Answer: Lime
22 Which one of the following can be used as an acid–base indicator by a visually impared student?
A Litmus
B Turmeric
C Vanilla essence
D Petunia leaves

Answer: Vanilla essence
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23 The pH of the gastric juices released during digestion is
A less than 7
B more than 7
C equal to 7
D None of the above

Answer: less than 7
24 To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is
A acidic
B neutral
C basic
D None of the above

Answer: basic
25 One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is
A hydrochloric acid
B tartaric acid
C acetic acid
D All the above

Answer: tartaric acid
26 What happens to the smell of vanilla or onion in the presence of Acids?
A Smell increases
B Smell vanishes
C No change
D A small increase in smell

Answer: A small increase in smell
27 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
A 4 mL
B 8 mL
C 12 mL
D 16 mL

Answer: 16 mL
28 A solution turns red litmus blue, its pH is likely to be
A 1
B 4
C 5
D 10

Answer: 10
29 Which sodium compound is used for softening hard water?
A Na2CO3
B NaHCO3
C NaCl
D All of the above

Answer: Na2CO3
30 The common name of CaOCl2 is
A Bleaching powder
B Common Salt
C Plaster of Paris
D Gypsum

Answer: Bleaching powder
31 The chemical formula of Plaster of Paris is
A CaSO4.2H2O
B CuSO4.5H2O
C CaSO4.1/2H2O
D All of the above

Answer: CaSO4.1/2H2O
32 Large crystals of raw salt from the deposits of solid salts are of which colour, in general?
A Black
B Brown
C White
D Green

Answer: Brown
33 Salts of a strong acid and weak base are
A Neutral
B Acidic
C Basic
D Both B and C

Answer: Acidic
34 The hardest substance in the human body is
A Tooth Enamel
B Femur
C Temporal bone
D None of the above

Answer: Tooth Enamel
35 Why does dry HCl gas not change the colour of the dry litmus paper?
A Because dry litmus paper is not an indicator
B Because HCl gas is a weak acid, we must use a strong acid
C Because dry HCl gas does not ionize to produce H+ ions
D None of the above

Answer: Because dry HCl gas does not ionize to produce H+ ions
36 Dilution is the process of
A Mixing acid with water
B Mixing strong acid with a strong base
C Mixing acid or base with water
D Mixing strong acid with a weak base

Answer: HClMixing acid or base with water
37 What are Olfactory Indicators?
A Substances whose colour changes in acidic or basic media
B A pH indicator made of a solution of several compounds
C A man-made chemical substance that can be used as acid-base indicators
D Substances whose odour changes in acidic or basic media

Answer: Substances whose odour changes in acidic or basic media
38 Blue litmus paper turns into which colour in basic conditions?
A Violet colour
B Red colour
C Blue colour
D No change

Answer: No change
39 Which of the following is the milk of magnesia?
A Ammonium hydroxide (NH4OH)
B Sodium hydroxide (NaOH)
C Magnesium hydroxide (Mg(OH)2)
D Potassium hydroxide (KOH)

Answer: Magnesium hydroxide (Mg(OH)2)
40 When acids are dissolved in water they produce ions which help in conducting the electricity. This process is known as
A Galvanization
B Vulcanisation
C Dissociation
D None of the above

Answer: Dissociation

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