Question

2. _________ is a substance which shows different colours in acidic and basic solutions. a. Indicator b. Thermometer c. Speedometer d. None of the above 3. Which of the following set of substances contain bases ? a. Grapes, lime water b. Vinegar, soap c. Window cleaner, milk of Magnesia d. None of these 4. Which of the following statements is/are true? i. Most of green plants can prepare their own food ii. All animals are autotrophs. iii. Carbon dioxide is not required for photosynthesis. iv. Oxygen is released during photosynthesis. Choose the correct answer from the options below: a. i and iv b. ii only c. ii and iii d. i and ii

Answer 1

Answer:

1 indicators

b. vinegar soap

4 d.