Question

1. Which one of the following will turn red litmus blue?

(a) Lemon juice (b) Tomatoes (c) Curd (d) All the above

2. Methyl orange is

(a) Red in acidic medium, yellow in basic medium

(b) Yellow in acidic medium, Red in basic medium

(c) Colourless in acidic medium, Red in basic medium

(d) Colourless in basic medium, Red in acidic medium

3. Pick out a true statement :

(a) pH of neutral solution is 7

(b) pH of acidic solution is more than 7

(c) pH of basic solution is less than 7

(d) None of these

4. An aqueous solution with pH=1 is

(a) Strongly basic

(b) Strongly acidic

(c) Weakly basic

(d) Weakly acidic

5. Which of the following can be used as an acid-base indicator by an visually impaired student

(a) Litmus

(b) Turmeric

(c) Vanilla essence

(d) Methyl orange

6. Equal volumes of HCl and NaOH of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?



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

7. The pH of water is _____.

8. Sodium hydroxide turns phenolphthalein into _______ colour.

9. State giving reason: Which is a stronger acid Sulphuric acid or acetic acid?

10. A gas is produced in the laboratory is highly soluble in water. Its colourless solution turns pink when few drops of phenolphthalein are added to it .What is the nature of the gas?

11. Why do acids not show acidic behaviour in absence of water?

12. You have been provided with three tubes. One of them contains distilled water and other two contain an acidic solution and a basic solution respectively. If you are given only red litmus paper ,how will you identify the contents of each test tube.







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Answer 1

Answer:

1. c

2.b

sorry Mujhe 1 aur 2 hi Aaya