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Acids Bases and Salts Test - 32

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Acids Bases and Salts Test - 32
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  • Question 1
    1 / -0
    Fill in the blanks with suitable words:

    Excessive use of fertilizers makes the soil ______ so it should be treated with ______ like ________. If the soil is ____ then the organic matter should be added to it.
    Solution
    Fertilizers contain the maximum amount of mineral acids so they increase the acidity of soils and it can be neutralized by the addition of calcium hydroxide or other basic chemicals. On the other hand, alkaline soils with high $$pH$$ content are neutralized by the addition of organic matter content in the soil.
  • Question 2
    1 / -0
    The difference in number of water molecules in gypsum and plaster of paris is 
    Solution
    Hint: Gypsum is calcium sulfate dihydrate and Plaster of Paris is calcium sulfate hemihydrate.

    Correct Answer: $$D$$

    Explanation for Correct Answer:

    Let's write formula of Gypsum and Plaster of paris along with water molecule:
    $$\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}-$$ Gypsum -- 2 molecules of water.
     $$\mathrm{CaSO}_{4} \cdot \dfrac{1}{2} \mathrm{H}_{2} \mathrm{O}-$$ Plaster of pairs -.- $$1 / 2$$ molecule of water in each.

    The difference in number of crystalline water molecules in a molecule of gypsum and a molecule of plaster of Paris is $$2-\dfrac{1}{2}=\dfrac{3}{2}$$.

  • Question 3
    1 / -0
    Arrange the following in order of increasing $$pH$$?
    Solution
    $$pH$$ of the solution is a measure of hydronium or hydrogen ion concentration in a solution.
    • Higher is the hydrogen ion concentration lower is the $$pH$$ of the solution and the solution will be acidic. $$pH$$ range of acidic solution is $$0-6.9$$
    • Lower is the hydrogen ion concentration, higher will be the $$pH$$ and solution will be basic. $$pH$$ of the basic solution ranges from $$7.1-14$$
    • A solution having $$pH$$ $$7$$ is neutral.
    Soda water is carbonated water so it has carbon dioxide present in it which reacts with water and form carbonic acid, therefore, it is acidic in nature having $$pH$$ between 3-4. The $$pH$$ of water is neutral i.e. $$7$$, while blood is alkaline in nature therefore its $$pH$$, will be above $$7$$ and in the range of  $$7.35-7.4$$
  • Question 4
    1 / -0
    The number of molecules of water of crystallization present in one molecule of ferrous sulfate is_______.
    Solution
    When water is used in the formation of crystals knows as water of crystallization.
    The water of crystallization is the total weight of water in a substance at a given temperature and is mostly present in a definite ratio. 
    On heating, iron(II) sulfate first loses its water of crystallization and the original green crystals are converted into a brown-colored anhydrous solid. 
    $$FeSO_4.7H_2O$$ is the heptahydrate in solution (water as solvent) transforms to both heptahydrate and tetrahydrate when the temperature reaches $$56.6 ^\circ C$$.
    Hence, option $$B$$ is correct.
  • Question 5
    1 / -0
    Which one of the following can be used as an acid base indicator by a visually impaired student?
    Solution
    Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. These are used in labs to test the acidity or basicity of the solution. Onion, clove oil and vanilla extract are examples.
  • Question 6
    1 / -0
    Five students, Ankit, Nitin, Deepika, Gunjan and Pooja were given test tubes having solutions with pH 1.2, 13.5, 10.0, 7.4 and 2.2 respectively. The correct order of decreasing $$OH^-$$ ion concentration in these solutions is:
    Solution

    As the pH value increases from 7 to 14, it represents an increase in $$OH^-$$  ion concentration in the solution, that is, increase in the strength of alkali.

    So order is: Nitin > Deepika > Gunjan > Pooja > Ankit
  • Question 7
    1 / -0
    When marble chips are treated with $$HCl$$, which of the following gas is liberated?
    Solution
    Marble chips are made up of calcium carbonate. When they are treated with $$HCl$$, carbon dioxide gas is released along with the formation of water and calcium chloride. 

    $${ CaCO }_{ 3 }+2HCl\rightarrow { CaCl }_{ 2 }+{ H }_{ 2 }O+{ CO }_{ 2 }$$.
  • Question 8
    1 / -0
    The acid present in tea is:
    Solution
    Some natural ingredients have some amount of acid present in them due to which they get their unique flavour.

    Tea has tannic acid in it, just like citrus fruits have citric acid and tamarinds have tartaric acid.

    Hence, the correct answer is an option $$(B)$$.
  • Question 9
    1 / -0
    Which property is common between vinegar and curd?
    Solution
    The sour taste of vinegar and curd is because of the presence of acid like lactic acid (curd) and acetic acid (vinegar).
  • Question 10
    1 / -0
    $$pH$$ of tomato juice is 4, that means it is:
    Solution
    The $$pH$$ of tomato juice is 4, which is less than 7 and so is acidic. Generally, a substance with $$pH$$ more than 7 is considered basic in nature.
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