Question

1. What baking soda? Is the baking soda acidic/basic/neutral? How would you verify it?

2. What are indicators? Why do we use it? Give examples.

3. Coffee is brown and bitter in taste. Is it an acid or a base? You are in dark with its taste.

4. Name the following:

a. Substances which turn turmeric paper red.

b. Chemical name for salt which we consume

everyday.

c. Base used as foaming agent in fire

extinguisher.

d. A commonly used antacid.

e. The substances on which litmus solution has

no effect.

f. The colour of turmeric solution in soap

solution

5. MCQ:-

A. Consider the following statements:

(i) Both acids and bases change colour of all indicators.

(ii) If an indicator gives a colour change with an acid, it does not give a change with a base.

(iii) If an indicator changes colour with a base, it does not change colour with an acid.

(iv) Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?

(a) All four (b) i and iv (c) ii and iii (d) only iv

B. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours

would be observed

(a) Yellow in both acid and base. (b) Yellow in acid and red in base.

(c) Pink in acid and yellow in base. (d) Red in acid and blue in base.

C. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively

are

(a) red and blue. (b) blue and red.

(c) pink and colourless. (d) colourless and pink

D. ‘Litmus’, a natural dye is an extract of which of the following?

(a) China rose (Gudhal) (b) Beetroot

(c) Lichen (d) Blue berries (Jamun)

E. Which of the following set of substances contain acids?

(a) Grapes, lime water (b) Vinegar, soap

(c) Curd, milk of magnesia (d) Curd, vinegar

​

Answer 1

Answer:

go out with my mom said I was going to bed soon too much for your email and password for the first place and the time