Practice Questions for Physical and Chemical Changes Science Class 8

Chemical changes are characterized by ______

Treating dilute sulphuric acid with sodium hydroxide solution is an example of __________ reaction.
Burning of hydrogen in air is a ____________ type of reaction.

Into what changes can these processes be categorized?
A. Milk --> Curd
\"\" --------> \"\"

B. Milk --> Paneer

\"\"----------> \"\"

The valency of a sulphate radical is _________.
Three different substances were taken and tested with litmus paper The results are given below.


How will the substance X behave with phenolphthalein?