SCIENCE X CLASS ACID, BASES AND SALT
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1. Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of:
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2. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y.
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3. . Which of the following phenomena occur, when a small amount of acid is added to water?i. Ionisationii. Neutralisationiii. Dilutioniv. Salt formation(i) and (ii)(i) and (iii)(ii) and (iii)(ii) and (iv)Answer. b. (i) and (iii)
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4. . Dilute acid does not produce carbon dioxide on being treated with:
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5. An ant’s sting can be treated with …………which will neutralise the effect of the chemical injected by the ant’s sting into our skin.Choose the correct option from the following
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6. IDENTIFY THE SALT FORMED: NH4OH (aq) + H2SO4 (aq) → _____ + 2H2O
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7. Brine is an
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8. Na2CO3 . 10H2O is
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9.At what temperature is gypsum heated to form Plaster of Paris?(a) 90°C(b) 100°C(c) 110°C(d) 120°C
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10. Lime water reacts with chlorine to give
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11. Rain is called acid rain when its:(a) pH falls below 7(b) pH falls below 6(c) pH falls below 5.6(d) pH is above 7
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12. When copper oxide and dilute hydrochloric acid react, colour changes to:
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13. Egg shell is made up of
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14. Calcium phosphate is present in tooth enamel. Its nature is:
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15. When a solution of an acid contains larger amount of acid, it is said to be-
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16. The example of olfactory indicators is:
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17. Which substance is used to purify water
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18. What is formed when zinc reacts with sodium hydroxide?
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19.What is the pH range of our body?
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