1What is an acid? Give the examples of any two acidic substances that can be obtained locally.
2What kind of acid is called an organic acid? Give any five examples of these acids.
3Write the names of three acids used in a laboratory.
4Write the physical properties of acid.
5Give the reason: sisnu burns when it is touched.
6Give the reason: lemon is sour.
7Give the reason: acid must be handled carefully.
8In Activity 10.4 the litmus paper must be moist. Why does a dry strip give almost no result?
9Your stomach makes hydrochloric acid, yet the book says inorganic acids must not be eaten. Explain.
10Why is something sour added when karkalo or pindalu is cooked?