Question

A. STATE WHETHER THE FOLLOWING STATEMENTS ARE TRUE OR FALSE.

CORRECT THE FALSE STATEMENTS.

(a) All substances are either acidic or basic.

(b) A compound if acidic will turn all indicators red.

(c) Lime water turns red litmus blue.

(d) Common salt dissolved in water turns blue litmus red.

(e) Phenolphthalein is a natural indicator.

(f) Lemon water is basic in nature



B. FILL THE BLANKS IN THE FOLLOWING SENTENCES



(a) Lemon juice and vinegar taste ___________ because they contain ___________.

(b) Turmeric and litmus are _________ acid-base indicators.

(c) Phenolphthalein gives _________ colour with lime water.

(d) When an acidic solution is mixed with a basic solution, they _________ each other.

C. ANSWER THE FOLLOWING-

1. What are bases? What are their physical properties?

2. Give two uses of eacha. Calcium hydroxide

b. Ammonium hydroxide

3. What is an acid- base indicator? Give one example.

4. Name the base used to manufacture the soap.
D. MULTIPLE CHOICE QUESTIONS:

1. 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.

2. 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

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

(a) China rose (Gudhal)

(b) Beetroot

(c) Lichen

(d) Blue berries (Jamun)

4. A solution changes the colour of turmeric indicator from yellow to red. The solution is

(a) Basic

(b) Acidic

(c) Neutral

(d) Either neutral or acidic

5. Which of the following is an acid-base indicator?

(a) Vinegar

(b) Lime water

(c) Turmeric

(d) Baking soda​

Answer 1

Answer:

1. False because all substances are acidic basic and NEUTRAL also.

2. True

3. True

4. False

5. False

6. False lemon water is acidic in nature.

Explanation:

I can just answer the true or false because it was hard for me.

If it help u then please mark me as brainlist.

Answer 2

Answer:

Explanaa) False. Substances can be neutral as well. (b) False. Acids do not turn all indicators red. (c) True (d) False. It does not change the colour of litmus at all. (e) False. It is a man-made indicator. (f) True (g) False. It is acidic in nature.Read more on Sarthaks.com - https://www.sarthaks.com/24667/state-whether-the-following-statements-are-true-or-false-correct-the-false-statementstion: