Exploring Substances: Acidic,Basic, and Neutral

class 7 science

General Instructions

  • Your test contains multiple-choice questions with only one answer-type question. There are a total of 10 questions
  • This is a 20 min test. Please make sure you complete it in the stipulated time
  • You can finish this test any time using the 'Submit' button.
1. Acid turns blue litmus paper to .........
2. which of these is not an acid -base indicator?
3. which of the following is a base?
4. which of the following is an acid?
5. which of these a natural indicator?
6. 'Litmus', a natural dye is an extract of which of the following?
7. Which of the following statements is correct?
8. Consider the following statements:
(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?
9. what is the nature of the washing power solution?
10. what is the product of the neutrilization  reaction?

 

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