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Acids Bases and Salts Test - 37

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Acids Bases and Salts Test - 37
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  • Question 1
    1 / -0
    The pH of tomato juice is:
    Solution
    $$pH$$ of tomato juice is around $$4$$. It is acidic in nature as it contains citric acid, ascorbic acid and malic acid which give it a low $$pH$$.
  • Question 2
    1 / -0
    Since there are $$10$$ water molecules in washing soda, hence it is known as:
    Solution
    Washing soda is called sodium carbonate. Since there are $$10$$ water molecules in washing soda, hence it is known as sodium carbonate decahydrate.
  • Question 3
    1 / -0
    What is the $$pH$$ of a most acidic solution among the following?
    Solution
    The $$pH$$ of a most acidic solution is $$1$$. Lower is the $$pH$$ value, higher is the acidic strength. Acidic solutions have $$pH < 7$$ and basic solutions have $$pH > 7$$. Neutral solutions have $$pH\: 7$$.
  • Question 4
    1 / -0
    Phenolpthalein is ____________ type of indicator.
    Solution
    Phenolpthalein is a synthetic indicator. It is colourless in acidic medium but gives pink colour in basic medium.
  • Question 5
    1 / -0
    Carbon dioxide reacts with calcium hydroxide to form calcium carbonate and water.

    $$\displaystyle Ca(OH)_2 + CO_2 \rightarrow CaCO_3 + H_2O$$

    This reaction is known as ______.
    Solution
    As we know that non-metals react with oxygen to form acidic oxides.
    Hence this reaction is an example of a neutralization reaction in which an acid (carbon dioxide) reacts with a base (calcium hydroxide) to form salt and water.
    Hence the correct option is A.
  • Question 6
    1 / -0
    From which plant is litmus paper or litmus solution obtained?
    Solution
    Litmus is a water soluble mixture of different dyes extracted from lichens.
  • Question 7
    1 / -0
    ____________ solution is blue in colour.
    Solution

    $$FeSO_4$$ has greenish blue colour

    $$CuSO_4$$ has blue colour in hydrated form and anhydrous form has white colour

    $$ZnSO_4$$ has white colour

    $$Al_2(SO_4)_3$$  is colourless

  • Question 8
    1 / -0
    A solution of $$CuSO_4$$ in water is __________ in colour.
    Solution
    A solution of $$\displaystyle CuSO_4$$ in water is blue in colour. Hydrated $$\displaystyle CuSO_4$$ is blue whereas anhydrous $$\displaystyle CuSO_4$$ is colourless.
  • Question 9
    1 / -0
    When few drops of dil. $$HCl$$ are added to a small amount of red copper oxide, the colour of the solution becomes:
    Solution
    When few drops of dil. $$HCl$$ is added to a small amount of red copper oxide, the colour of solution becomes blue due to the formation of chloride of copper $$CuCl_2$$.
    $$\displaystyle CuO + 2HCl \rightarrow CuCl_2 + H_2O$$
  • Question 10
    1 / -0
    When you add a few drops of acetic acid to a test-tube containing sodium bicarbonate powder, which one of the following is your observation?
    Solution
    $$\bf{Concept-}$$
    When sodium bicarbonate reacts with the acetic acid it gives the sodium salt of acetic acid, water and carbon dioxide gas. Sodium carbonate is represented by the formula $$NaHCO_3$$ and acetic acid is represented as $$CH_3COOH$$.

    $$\bf{Correct\ option-}$$
    Option B is correct.

    $$\bf{Explanation-}$$
    By the reaction of an acid with sodium bicarbonate, the aqueous sodium salt of the acid, and carbon dioxide gas form.
    The reaction of sodium bicarbonate and acetic acid is as follows:
    $$NaHCO_3+CH_3COOH \rightarrow CH_3COONa + H_2CO_3$$

    The reaction of acetic acid with sodium bicarbonate gives aqueous sodium acetate and carbonic acid. The carbonic acid is highly unstable so, it decomposes to give water and carbon dioxide as follows:
    $$H_2CO_3 \rightarrow H_2O + CO_2$$
    This carbon dioxide gas is released out of the test–tube which is observed in the form of brisk effervescence.
    So, a colourless and odourless carbon dioxide gas is released with brisk effervescence when you add a few drops of acetic acid to a test tube containing sodium bicarbonate powder.

    $$\bf{Conclusion-}$$
    Carbon dioxide is a colourless and odourless gas. So, only the brisk effervescence can be seen which confirms the evolution of the gas. As the carbon dioxide evolves the lime water converts into milky which also confirms the evolution of the gas.
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