Science Olympiad Miscellaneous Worksheet-11

Science Olympiad Miscellaneous Worksheet-11

1. Which of the following is the most accurate way of showing neutralisation?

(a) Acid + base → neutral solution

(b) There is no reaction between acids and bases

(c) Acid + base → sodium chloride + hydrogen

(d) Acid + base → salt + water

2. What are the products, if a reaction occurs between nitric acid and sodium hydroxide?

(a) Sodium hydrogenate + water

(b) Sodium nitrate + water

(c) Sodium nitrate + hydrogen

(d) No reaction

3. Aluminium will react with Hydrochloric acid. What are the products of this reaction?

(a) No reaction

(b) Aluminium chloride + hydrogen

(c) Hydrogen chloride + aluminium

(d) Aluminium + hydrogen

4. What are the products when silver reacts with dilute sulphuric acid?

(a) Silver sulphate + hydrogen

(b) Silver doesn't react with dilute sulphuric acid.

(c) Silver sulphate + water

(d) Silver sulphide + hydrogen

5. If a base is dissolved in water, by what name is it better known?

(a) Neutralisation                         (b) Alkali

(c) Acid                                           (d) Basic

6. Which of the following is a base?

(a) Vinegar                                     (b) Common salt

(c) Tomato juice                           (d) Caustic soda

7. What will the colour of litmus paper turn into when dipped in orange juice?

(a) Red               (b) Purple                   (c) Blue              (d) Orange

8. Generally, how does a base taste?

(a) Salty             (b) Sweet           (c) Spicy             (d) Bitter

9. Which of the following is NOT an indicator?

(a) Methyl Orange                       (b) Methyl Red

(c) Demathalin                             (d) Phenolphthalein

10. What is the pH of water considered to be?

(a) Basic            (b) Neutral        (c) Acidic           (d) None of these

11. Which of the following acids is used for cleaning cement floors?

(a) Tartaric acid                           (b) Sulphuric acid

(c) Hydrochloric acid                  (d) Nitric acid

12. Which of the following bases is involved in the making of soap?

(a) Baking soda                             (b) Washing soda

(c) Ammonia                                 (d) Caustic soda

13. Which of the following is neutral in water?

(a) Iodine                                       (b) Potassium chloride

(c) Baking soda                             (d) Diethyl amine

14. What is the nature of common salt?

(a) None of these                          (b) Acidic

(c) Neutral                                     (d) Basic

15. In a pH strip, if the range is from 8 to 11, what colour does it show?

(a) Grey- black                              (b) Orange- red

(c) Blue- Violet                              (d) Green

16. Litmus is a common indicator used to tell whether something is an acid or a base. If you dip a piece of blue litmus paper into an acid, what color will it turn?

(a) None, it will stay blue           (b) Red

(c) Purple                                       (d) Yellow

17. If you dip a piece of red litmus paper into an acid, what color will it turn?

(a) Blue                                          (b) Purple

(c) Yellow                                       (d) None, it will stay red

18. Phenolphthalein is another acid-base indicator. What is the abbreviation for this indicator?

(a) PHTH          (b) PPTN           (c) PHPH           (d) PLTL

19. If you were to drop some phenolphthalein into a base, what colour would it turn?

(a) Purple-Pink                             (b) Clear

(c) Red                                            (d) Yellow

20. Goldenrod paper comes as little strips, similar to litmus. If you dip a piece of goldenrod paper in a base, what colour would it turn?

(a) Red               (b) Yellow                   (c) Orange         (d) Green

21. Into what colour would universal indicator turn in a very strong acid?

(a) Yellow          (b) Purple                   (c) Green           (d) Red

22. What colour would universal indicator turn if a substance was neutral?

(a) Green           (b) Red               (c) Yellow          (d) Blue

23. If you were to put some universal indicator in a very strong base, what colour would it turn?

(a) Green           (b) Purple                   (c) Yellow          (d) Red

24. One unconventional indicator is red cabbage juice. What colour will this common liquid turn in a base?

(a) Yellow          (b) Purple                   (c) Blue-Green (d) Red

25. An indicator that you wouldn't find at home is Phenol Red. What colour does this indicator turn in an acid?

(a) Red               (b) Pink              (c) Green           (d) Yellow

26. Which part of the internal ear is meant for hearing?

(a) Cochlea                                    (b) Ear Drum

(c) Auditory Bones                       (d) All of these

Answer Key:

(1)-(d); (2)-(b); (3)-(b); (4)-(b); (5)-(b); (6)-(d); (7)-(a); (8)-(d); (9)-(c); (10)-(b); (11)-(c); (12)-(d); (13)-(b); (14)-(c); (15)-(c); (16)-(b); (17)-(d); (18)-(a); (19)-(a); (20)-(a); (21)-(d); (22)-(a); (23)-(b); (24)-(c); (25)-(d); (26)-(a)