(a) What is meant by a chemical reaction ? Explain with the help of an example (b) Given one example
Channel: Doubtnut
Date: 2020-02-02

(a) What is meant by a chemical reaction ? Explain with the help of an example (b) Given one example each of a chemical reaction characterised by: (i) evolution of a gas (ii) change in colour (iii) formation of a preopitate (iv) change in temperature (v) change in state.