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Free download in PDF Acids Bases and Salts Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(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
(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
(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
(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
(28)
A solution turns red litmus blue, its pH is likely to be
(29)
Which sodium compound is used for softening hard water?
[A]
Na2CO3
[B]
NaHCO3
[C]
NaCl
[D]
All of the above
(30)
The common name of CaOCl2 is
[A]
Bleaching powder
[B]
Common Salt
[C]
Plaster of Paris
[D]
Gypsum
31
The chemical formula of Plaster of Paris is
[A]
CaSO4.2H2O
[B]
CuSO4.5H2O
[C]
CaSO4.1/2H2O
[D]
All of the above
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
33
Salts of a strong acid and weak base are
[A]
Neutral
[B]
Acidic
[C]
Basic
[D]
Both B and C
34
The hardest substance in the human body is
[A]
Tooth Enamel
[B]
Femur
[C]
Temporal bone
[D]
None of the above
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
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
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