| 1. | Which of the following salts does not contain water of crystallization ? | |
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Gypsum
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Blue vitriol
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Washing soda
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Baking soda
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Report Question| 2. | Payal is writing some statements, choose the correct statement ? | |
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Phenolphthalein indicator gives colourless in acid solution, and pink colour in basic solution.
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Sodium hydroxide solution turns red litmus to blue, so sodium hydroxide solution is basic in nature.
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Methyl orange indicator gives red colour in acid solution, and yellow colour in basic solution.
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All the above
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| 3. | Sodium Hydrogen Carbonate, When added to acetic acid, evolves a gas. which of the following statements are true about the gas evolved ? | |
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It turns lime water milky, and it has a pungent odour.
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It extinguishes a burning splinter, it dissolves in a solution of sodium hydroxide, and it has a pungent odour.
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It turns lime water milky, and it extinguishes a burning splinter.
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It turns lime water milky, and it extinguishes a burning splinter, and it dissolves in a solution of sodium hydroxide.
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| 4. | To protect tooth decay we are advised to brush our teeth regularly. The nature of toothpaste commonly used is ? | |
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Basic
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Corrosive
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Acidic
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Neutral
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| 5. | Setting of Plaster of Paris takes place due to ? | |
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Reduction
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Hydration
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Dehydration
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Oxidation
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| 6. | Lime water reacts with chlorine to give ? | |
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baking soda
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washing soda
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baking powder
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bleaching powder
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| 7. | If pH of solution is 13, it means that if is ? | |
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Weakly acidic
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Strongly acidic
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Strongly Basic
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Weakly basic
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| 8. | Bleaching powder is used as a disinfectant for water to ? | |
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Make water clear
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Remove all the dirt from water
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Make water tastier
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Make water germ free
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| 9. | Which one of the given is incorrect ? | |
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Acids react with certain metals to form hydrogen gas
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Aqueous solutions of acids conduct electricity
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Acids turns blue litmus paper red
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None of these
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| 10. | A drop of liquid sample was put on the pH paper, paper turned blue. The liquid sample must be of ? | |
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Sodium bicarbonate
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Lemon Juice
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Ethanoic acid
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HCl
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