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Acids, Bases And Salts Test - 1

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Acids, Bases And Salts Test - 1
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following acids is present in ant sting?

    Solution

    Methanoic acid, also called formic acid, is present in the sting of ants and honey bees.

     

  • Question 2
    1 / -0

    Which of the following solutions can be used to remove the odour of onion from a strip of cloth?

    Solution

    Dipping the strip in dil. NaOH would help to get rid of the odour.
    Therefore, onion juice is used as an olfactory indicator since it loses its odour with bases but retains it with acids.

     

  • Question 3
    1 / -0

    Which of the following statements about acids are correct?

    I. Bronsted acids are proton donors.
    II. Arrhenius acids furnish hydronium ions in their aqueous solutions.
    III. All Arrhenius acids are also Bronsted acids.
    IV. All Bronsted acids are also Arrhenius acids.

    Solution

    By the Lowry-Bronsted concept, acids are proton donors.
    By the Arrhenius concept also acids are protons donors, but the concept is limited to aqueous solutions.

    Therefore, every Arrhenius acid is also a Bronsted acid.
    However, every Bronsted acid need not be an Arrhenius acid.

    Hence, statement IV is incorrect.

     

  • Question 4
    1 / -0

    Analyse the two statements given below and select the correct option.

    Statement I: When the free ends of a tester are dipped in solutions containing dilute solutions of HCl and CH3COOH turnwise, the bulb lights up more brightly in the first case.

    Statement II: HCl is a stronger acid than CH3COOH.

    Solution

    HCl is a strong acid (strong electrolyte) and dissociates completely in its aqueous solution, whereas CH3COOH being a weak acid (weak electrolyte) dissociates partially.
    Hence, the aqueous solution of HCl contains more ions and has a greater conductivity.

     

  • Question 5
    1 / -0

    According to Arrhenius concept, a base is a substance that furnishes the anion of the solvent (water). On the basis of this concept, which one of the following can be categorised as a base?

    Solution

    CaO (s) + H2O (l) → Ca(OH)2 (aq)

    Ca(OH)2 → Ca+2 (aq) + 2OH- (aq)

     

  • Question 6
    1 / -0

    Which among the following is not an alkali?

    Solution

    An alkali is a water-soluble base. Among the given options, Cu(OH)2 is not an alkali.

     

  • Question 7
    1 / -0

    Directions For Questions

    In the following question, two statements are given, one labelled as Assertion and the other as Reason. Examine both the statements carefully and mark the correct answer accordingly.

    ...view full instructions

    Assertion (A): The flowers of Hydrangea plant turn pink in the presence of potassium hydroxide.

    Reason (R): The flowers of Hydrangea plant are usually pink, which turn blue in the presence of a base.

    Solution

    Hydrangea flowers can act as a natural indicator and their colour depends on the pH of the soil. It is pink in basic soil and blue in acidic soil. Therefore, the statement A that the colour of the flower is pink in the presence of a base (KOH) is true.

    However, the second statement (R) is false.

     

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