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General Science for Class 7
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Wasp sting is neutralized by rubbing skin with
soap
orange juice
vinegar
anti acid
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Any solution in which solvent is water, is called
aqueous solution
hydrated solution
anhydrous
water solution
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Tooth decay occurs in our mouth due to presence of
bacteria
virus
fungus
algae
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Medicinal drugs are bitter in taste hence they are added with
sugar
salt
water
dry ice
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‘Aqueous’ solution includes
salt solution
sugar solution
mineral water
all of them
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The acid which is found in the sting of a bee and the bite of an ant is
carbonic acid
lactic acid
formic acid
citric acid
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A ph scale ranges from zero to
10
6
11
14
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For removing paints and dyes ‘caustic potash’ is used. Its scientific name is
potassium hydroxide
sodium hydroxide
magnesium carbonate
magnesium hydroxide
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A substance which has a bitter taste, soapy to touch and turns red litmus into blue is called
alkali
acid
solution
solvent
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The ‘pH’ of rain water is slightly
acidic
basic
neutral
alkali
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