GOVT URDU HIGH SCHOOL YELLAGONDAPALYA

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ACID BASES AND SALT

QUIZ

1. Chemical formula of washing soda is

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(a) Na2C03 . 7H2O

(b) Na2C03 . 5H2O

(d) Na2C03 . 10H2O

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2. Sodium hydroxide turns phenolphthalein solution

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(a) pink

(b) yellow

(d) orange

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3. Sodium hydroxide is used

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(a) as an antacid

(b) in manufacture of soap

(d) in alkaline batteries

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4. When copper oxide and dilute hydrochloric acid react, colour changes to

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(a) white

(b) bluish-green

(d) black

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5. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution

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(a) Baking powder

(b) Lime

(d) Hydrochloric acid

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6. Sodium hydroxide is a

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(a) weak base

(b) weak acid

(d) strong acid

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7. Rain is called acid rain when its:

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(a) pH falls below 7

(b) pH falls below 6

(d) pH is above 7

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8. What is the pH range of our body?

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(a) 7.0 – 7.8

(b) 7.2 – 8.0

(d) 7.2 – 8.4

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9. Tooth enamel is made up of

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(a) calcium phosphate

(b) calcium carbonate

(d) potassium

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10. Lime water reacts with chlorine to give

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(a) bleaching powder

(b) baking powder

(d) washing soda

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11. The apparatus given in the adjoining figure was set up to demonstrate electrical conductivity.Which of the following statement(s) is (are) correct?(i) Bulb will not glow because electrolyte is not acidic.(ii) Bulb will glow because HCl is a strong acid and furnishes ions for conduction.(iii) Bulb will not glow because circuit is incomplete.(iv) Bulb will not glow because it depends upon the type of electrolytic solution.

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(a) (i) and (iii)

(b) (ii) and (iv)

(d) (iv) only

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12. Which of the following statements is correct about an aqueous solution of an acid and of a base?(i) Higher the pH, stronger the acid(ii) Higher the pH, weaker the acid(in) Lower the pH, stronger the base(iv) Lower the pH, weaker the base

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(a) (i) and (iii)

(b) (ii) and (iii)

(d) (ii) and (iv)

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13. Alkalis are

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(a) acids, which are soluble in water

(b) acids, which are insoluble in water

(d) bases, which are soluble in water

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14. Sodium carbonate is a basic salt because it is a salt of a

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(a) strong acid and strong base

(b) weak acid and weak base

(d) weak acid and strong base

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15. How many water molecules does hydrated cal-cium sulphate contain?

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(a) 5

(b) 10

(d) 2

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16. At what temperature is gypsum heated to form Plaster of Paris?

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(a) 90°C

(b) 100°C

(d) 120°C

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17. Na2CO3 . 10H2O is

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(a) washing soda

(b) baking soda

(d) tartaric acid

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18. Brine is an

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(a) aqueous solution of sodium hydroxide

(b) aqueous solution of sodium carbonate

(d) aqueous solution of sodium bicarbonate

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19. Tomato is a natural source of which acid?

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(a) Acetic acid

(b) Citric acid

(d) Oxalic acid

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20. What is formed when zinc reacts with sodium hydroxide?

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(a) Zinc hydroxide and sodium

(b) Sodium zincate and hydrogen gas

(d) Sodium zincate and water

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