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Class 7 Science
Acids, Bases And Salts
Quiz 1
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An oxide is acidic and has a pungent odour. It could be
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sulphur dioxide
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carbon dioxide
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sodium oxide
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nitrogen dioxide
Explanation
nitrogen dioxide
Out of these gases which one is used in fire extinguishers
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CO
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SO
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NO
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H
Explanation
CO
The correct way of making a solution of acid in water is to
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add water to acid
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add acid to water
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mix acid and water simultaneously
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add water to acid in a shallow container
Explanation
add acid to water
Products of a neutralisation reaction are always:
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an acid and a base
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an acid and a salt
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a salt and water
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a salt and a base
Explanation
a salt and water
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed.
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Yellow in both acid and base
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Yellow in acid and red in base
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Pink in acid and yellow in base
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Red in acid and blue in base
Explanation
Yellow in acid and red in base
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are:
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red and blue
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blue and red
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pink and colourless
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colourless and pink
Explanation
colourless and pink
When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
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Organic matter
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Quick lime
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Slaked lime
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Calamine solution
Explanation
Organic matter
Which of the following set of substances contain acids?
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Grapes, lime water
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Vinegar, soap
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Curd, milk of magnesia
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Curd, vinegar
Explanation
Curd, vinegar
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
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Basic
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Either acidic or basic
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Either acidic or neutral
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Either basic or neutral
Explanation
Either acidic or neutral
Which of the following is an acid-base indicator?
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Vinegar
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Lime water
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Turmeric
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Baking soda
Explanation
Turmeric
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