| 1. | Calcium phosphate is present in tooth enamel. Its nature is ? | |
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amphoteric
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neutral
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basic
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acidic
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Report Question| 2. | An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ? | |
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Ammonium hydroxide solution
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Hydrochloric acid
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Lime
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Baking power
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| 3. | A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue ? | |
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An antacid
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Common salt
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Lemon juice
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Vinegar
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| 4. | During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to ? | |
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absorb moisture from the gas
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absorb CL ions from the evolved gas
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moisten the gas
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absorb the evolved gas
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| 5. | In terms of acidic strength, which one of the following is in the correct increasing order ? | |
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Hydrochloric acid < Water < Acetic acid
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Acetic acid < Water < Hydrochloric acid
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Water < Hydrochloric acid < Acetic acid
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Water < Acetic acid < Hydrochloric acid
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| 6. | Tomato is a natural source of which acid ? | |
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Tartaric acid
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Oxalic acid
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Citric acid
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Acetic acid
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| 7. | How many water molecules does hydrated calcium sulphate contain ? | |
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10
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5
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2
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7
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| 8. | The chemical formula of caustic potash is ? | |
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KOH
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NH4OH
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Ca(OH)2
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NaOH
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| 9. | Acid present in apple is ? | |
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Acetic acid
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Formic acid
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Malic acid
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Oxalic acid
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| 10. | An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ? | |
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Ammonium hydroxide solution
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Hydrochloric acid
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Lime
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Baking powder
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