Q: no: 2: Short answer questions. /12*2=24
1) Write two difference between Ions and Free Radicals.
2) Define empirical formula with an example.
3) Define atomic mass unit. Why is it needed?
4) Why is an iron grill painted frequently?
5) What is the nature of electrode used in electrolyzing of chromium?
6) Where do the electrons flow from Zn electrode in Daniel’s cell?
7) Why is O2 necessary for rusting?
8) Why are silver and gold least reactive?
9) Why is copper used for making electrical wires?
10) How electro positivity depends upon size and nuclear charge of an atom?
11) Define Matter and Substance.
12) Define molecular formula with an example.
Previous paper class 9th(Chemistry)
