Question

Question 1.

What is the test for acids and bases using litmus paper?


Question 2.

What name is given to those substances which do not change the colour of either

red or blue litmus paper?


Question 3.

Write the name of two indicators which occur naturally.


Question 4.

Name the acid present in lemon juice and tomato.


Question 5.

Name a substance which is used to cure the discomfort caused by indigestion due to

over eating.


Question 6.

Why does a turmeric stain on white shirt is turned to red when it is washed with

soap?


Question 7.

Is lime water an acidic or basic solution?


Question 8.

What is the nature of baking soda?


Question 9.

Name the reaction when an acid is mixed with base.


Question 10.

Which acid is injected into our body by an ant sting that causes pain?​

Answer 1

Answer:

The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutral litmus paper is purple.

Answer 2

Answer:

7. sour, bitter

8. ....