Question

Q.12 Name the factors on which friction between two surfaces depends?


Q.13 What are ions? Also name the ions produced when an electric

charge is passed through a solution of NaCl.​

Answer 1

Answer:

answer of 13 question

electrically charged atoms or group of atome are called ions.

Electrolysis of Aqueous NaCl

Since water can be both oxidized and reduced, it competes with the dissolved Na+ and Cl– ions. Rather than producing sodium, hydrogen is produced.

answer of 12 question

rough surface have more friction.while smooth surface have less friction

Answer 2

Answer:

1.Friction depends on two factors: (i) Nature of the surfaces in contact i.e. whether surface is rough or smooth. Friction depends on the smoothness or roughness of the two surfaces which are in contact. A rough surface produces greater friction as compared to a smooth surface

2.The result is sodium chloride (NaCl), composed of one positively charged sodium ion (Na+) and one negatively charged chloride ion (Cl−). A positively charged ion is called a cation; a negatively charged ion, an anion