Question

Subject - Science
Chapter - Acids bases and salts.

Q1. What happens when juice of China rose petals is added to acids?

Q2. What happens when juice of China rose is added to base ?

Q3. What is synthetic indicator? Give examples?

Q4. What happens when strip of blue litmus paper is added to acid? Give reason.

Q5. What happens when strip of red litmus paper is added soap solution? Give reason.

Q6. What is neutralisation reaction ? Give example.​

Answer 1

1.China rose converts acidic solution to dark pink, basic solutions to green colour and has no colour change for neutral solutions.

2.China rose converts acidic solution to dark pink, basic solutions to green colour and has no colour change for neutral solutions.

3.Synthetic indicators are indicators which are synthesized in the laboratory. Examples of synthetic indicators include phenolphthalein, methyl orange etc.

4.Blue litmus paper turns red under acidic conditions (pH below 4.5).

5.The red litmus change the color to Blue in soap solution.

6.A reaction of an acid with a base to form salt and water is a neutralization reaction. ... Since acid and base neutralize each other's effect,it is called neutralization reaction. For Example: When Sodium Hydroxide ( NaOH) , a base, reacts with Hydrochloric acid (HCl) , it forms the salt, Sodium Chloride (NaCl) and Water.

Answer 2

Answer:

1. China rose converts acidic solution to dark pink, basic solutions to green colour and has no colour change for neutThe red litmus change the color to Blue in soap solution.
2. China rose is a natural indicator. It turns an Acidic solution to dark pink / magenta colour. China rose in natural indicators. It turns Basic solution to green.
3. Synthetic indicators are indicators which are synthesized in the laboratory. Examples of synthetic indicators include phenolphthalein, methyl orange etc. litmus paper is also an example of synthetic indicator.
4. When strip of blue litmus paper is added to acid Acid turns blue litmus red. Bases turn red litmus blue. Substances which are neither acidic nor basic are called neutral. Solutions of substances that show different colour in acidic, basic and neutral solutions are called indicators.
5. The red litmus change the color to Blue in soap solution.

Hope this helps you ☺️....