WorksheetsACID BASES AND SALTS
Total questions: 27
Worksheet time: 16mins
A solution turns red litmus blue, its pH is likely to be
(a) 1
(b) 4
(c) 5
(d) 10
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 of 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
(a) Only 1
(b) 1 and 4
(c) 2 and 4
(d) 1 and 2
During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
(a) absorb the evolved gas
(b) absorb moisture from the gas
(c) moisten the gas
(d) absorb Cl- ions from the evolved gas
Sodium carbonate is a basic salt because it is a salt of
(a) strong acid and strong base
(b) weak acid and weak base
(c) weak acid and strong base
(d) strong acid and weak base
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowishorange. Which of the following would change the colour of this pH paper to greenish-blue?
(a) An antacid
(b) Vinegar
(c) Common salt
(d)Lemon Juice
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
(a) Wash the hand with saline solution
(b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate.
(c) After washing with plenty of water apply solution of sodium hydroxide on the hand.
(d) Neutralize the acid with a strong alkali.
Common salt besides being used in kitchen can also be used as the raw material for making
1. washing soda
2. bleaching powder
3. baking soda
4. slaked lime
(a) 1 and 2
(b) 1, 2 and 4
(c) 1 and 3
(d) 1, 3 and 4
To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is
(a) acidic
(b) neutral
(c) basic
(d) corrosive
The pH of the gastric juices released during digestion is
(a) less than 7
(b) more than 7
(c) equal to 7
(d) equal to 0
Which one of the following can be used as an acid-base indicator by a visually impaired student?
(a) Litmus
(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves
Which of the following is acidic in nature?
(a) Lime juice
(b) Human blood
(c) Lime water
(d) Antacid
Which of the following is used for dissolution of gold?
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Aqua regia
Which among the following is not a base?
(a) NaOH
(b) KOH
(c) NH4OH
(d) C2H5OH
(a) A and E are chemically same
(b) A and D are chemically same.
(c) D and E are chemically same.
(d) C and E are chemically same.
(a) 1 and 3
(b) 2 and 4
(c) Only 2
(d) Only 4
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3
(a) A- (ii), B- (i), C- (iv), D- (iii)
(b) A- (iii), B- (ii), C- (iv), D- (i)
(c) A- (iii), B- (iv), C- (i), D- (ii)
(d) A- (ii), B- (iv), C- (i), D- (iii)
Assertion : Salts of strong acids and weak bases are basic in nature.
Reason : pH value of such salt are mare than 7.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false
Assertion : Limestone, chalk and marble react with acids to form salt, carbon dioxide and water.
Reason : Limestone, chalk and marble are different forms of calcium carbonate.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Assertion : Non-metallic oxides are acidic is nature.
Reason : Non-metallic oxides react with base to form salt and water just like an acid reacts with a base.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Acidic solutions have excess of hydrogen ions. Even the acidic solutions contain hydroxide ions which come form the ionisation of water but the concentration of hydroxide ions in acidic solutions is much less than that of hydrogen ions. The basic solution have excess of hydroxide ions. Even the basic solutions have hydrogen ions in them which come form the ionisation of water but the concentration of hydrogen ions in basic solutions is much less than that of hydroxide ions. In 1909 Sorenson devised a scale (known as pH scale) on which the strength of acid solutions as well as basic solutions could be represented by making use of the hydrogen ion concentrations in them. Sorensen linked the hydrogen ion concentrations of acid and base solutions to the simple numbers 0 to 14 on his pH scale. The pH of a solution is inversely proportional to the concentration of hydrogen ions in it. In everyday life, pH plays an important role on daily basis like in gardening and farming, the best crops are usually obtained with neutral or slightly acidic soil (pH 6.5 to 7.0), tooth decay starts when the pH of mouth is lower than 5.5. Bee-sting leaves an acid which causes pain and irritation etc.
Which of the following substance(s) is added by farmers if the soil is acidic?
(a) Common salt
(b) Slaked lime
(c) Vinegar
(d) Limestone
Rain is called an acid rain when the pH is
(a) above 8.5
(b) below 6.5
(c) below 5.6
(d) between 7-8
During indigestion, which acid is produced by the stomach that causes irritation and pain?
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Phosphoric acid
The basic salt that gives relief on the stung area is
(a) washing soda
(b) caustic soda
(c) baking soda
(d) bleaching powder
Which of the following type of medicines is used for the treatment of hyperacidity in the stomach?
(a) Antiseptic
(b) Antibiotic
(c) Analgesic
(d) Antacid
