Acids, Bases and Salts


Which one of the following is the number of water molecules that share with two formula unit CaSO4 in Plaster of Paris?

  1. One
  2. Two
  3. Five
  4. Ten
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Which one of the following is the chemical formula of Washing Soda?

  1. NaCO3
  2. Na2CO3.10H2O
  3. Na2CO3.5H2O
  4. NaOH
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Brine is an aqueous solution of

  1. NaCl
  2. NaOH
  3. NaHCO3
  4. Na2CO3
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Which one of the following gives the highest amount of hydrogen ions (H+)?

  1. Sodium hydroxide solution
  2. Milk of magnesia
  3. Lemon juice
  4. Gastric juice
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Which of the following properties is true for a tooth paste?

  1. It is acidic.
  2. It is neutral.
  3. It is basic.
  4. It is made up of calcium phosphate, the material of tooth enamel.
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The accidental touch of Nettle leaves creates a burning sensation, which is due to inject of

  1. Hydrochloric acid
  2. Methanoic acid
  3. Citric acid
  4. Sulphuric acid
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In the reaction ZnO + C → Zn + CO, 'C' acts as

  1. an acid
  2. a base
  3. an oxidising agent
  4. a reducing agent
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Which of the following acids is a mineral acid

  1. Citric acid
  2. Ascorbic acid
  3. Tartaric acid
  4. Hydrochloric acid
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Which one of the following is a reducing substance?

  1. Oxygen
  2. Iron
  3. Potassium permanganate
  4. Potassium dichromate
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Consider the following reaction:

CH4 + 2O2 → CO2 + 2H2O

Which of the following about the reaction given above is/are correct?

  1. Carbon is oxidized.
  2. Hydrogen is oxidized.
  3. Hydrogen is reduced.
  4. Carbon is reduced.

Select the correct answer using the code given below:

  1. 1 only
  2. 1 and 2 only
  3. 2 and 3 only
  4. 2 and 4 only
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The desirable range of pH for drinking water is

  1. 6.5 to 8.5
  2. 5.0 to 6.5
  3. 6.5 to 7.0
  4. 7.0 to 8.5
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Why is potassium permanganate used for purifying drinking water?

  1. It kills germs
  2. It dissolves the impurities
  3. It is a reducing agent
  4. It is an oxidizing agent
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Zinc is used to protect iron from corrosion because zinc is

  1. more electropositive than iron
  2. cheaper than iron
  3. a bluish white metal
  4. a good conductor of heat and electricity
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Identify the correct representation of reaction occurring during chloralkali process

  1. 2NaCl(l) + 2H2O(l) → 2NaOH(l) + Cl2(g) + H2(g)
  2. 2NaCl(aq) + 2H2O(aq) → 2NaOH(aq) + Cl2(g) + H2(g)
  3. 2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + Cl2(aq) + H2(aq)
  4. 2NaCl (aq) + 2H2O (l) → 2NaOH(aq) + Cl2(g) + H2(g)
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Which of the following is not a mineral acid?

  1. Hydrochloric acid
  2. Citric acid
  3. Sulphuric acid
  4. Nitric acid
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Which of the following is used for dissolution of gold?

  1. Hydrochloric acid
  2. Sulphuric acid
  3. Nitric acid
  4. Aqua regia
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The pH of the gastric juices released during digestion is

  1. less than 7
  2. more than 7
  3. equal to 7
  4. equal to 0
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One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

  1. hydrochloric acid
  2. tartaric acid
  3. acetic acid
  4. sulphuric acid
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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

Select the correct option:

  1. (i) and (ii)
  2. (i), (ii) and (iv)
  3. (i) and (iii)
  4. (i), (iii) and (iv)
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Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?

  1. It turns lime water milky
  2. It extinguishes a burning splinter
  3. It dissolves in a solution of sodium hydroxide
  4. It has a pungent odour

Select the correct option:

  1. (i) and (ii)
  2. (i), (ii) and (iii)
  3. (ii), (iii) and (iv)
  4. (i) and (iv)
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Which of the following gives the correct increasing order of acidic strength?

  1. Water < Acetic acid < Hydrochloric acid
  2. Water < Hydrochloric acid < Acetic acid
  3. Acetic acid < Water < Hydrochloric acid
  4. Hydrochloric acid < Water < Acetic acid
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A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

  1. Lemon juice
  2. Vinegar
  3. Common salt
  4. An antacid
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Calcium phosphate is present in tooth enamel. Its nature is

  1. basic
  2. acidic
  3. neutral
  4. amphoteric
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Which of the following salts does not contain water of crystallisation?

  1. Blue vitriol
  2. Baking soda
  3. Washing soda
  4. Gypsum
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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

  1. absorb the evolved gas
  2. moisten the gas
  3. absorb moisture from the gas
  4. absorb Cl ions from the evolved gas
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An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

  1. Baking powder
  2. Lime
  3. Ammonium hydroxide solution
  4. Hydrochloric acid
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What happens when a solution of an acid is mixed with a solution of a base in a test tube?

  1. The temperature of the solution increases
  2. The temperature of the solution decreases
  3. The temperature of the solution remains the same
  4. Salt formation takes place

Select the correct option:

  1. (i) only
  2. (i) and (iii)
  3. (ii) and (iii)
  4. (i) and (iv)
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Which of the following set of substances contain acids?

  1. Grapes, lime water
  2. Vinegar, soap
  3. Curd, milk of magnesia
  4. Curd, vinegar
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Litmus, a natural dye is an extract of which of the following?

  1. China rose (Gudhal)
  2. Beetroot
  3. Lichen
  4. Blue berries (Jamun
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When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

  1. Organic matter
  2. Quick lime
  3. Slaked lime
  4. Calamine solution
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Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are

  1. red and blue.
  2. blue and red.
  3. pink and colourless.
  4. colourless and pink.
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Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed

  1. Yellow in both acid and base.
  2. Yellow in acid and red in base.
  3. Pink in acid and yellow in base.
  4. Red in acid and blue in base.
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Products of a neutralisation reaction are always

  1. an acid and a base.
  2. an acid and a salt.
  3. a salt and water.
  4. a salt and a base.
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