Question

1) a) What are the Dalton's postulates? (3M))

b) Define Valency. Write it for Carbon and Helium. (2M)

2) a) Differentiate between Boiling and Evaporation. (3M)

b) What is molecule? Give its types. (2M)​

Answer 1

Explanation:

1.(a)All matter consists of indivisible particles called atoms. Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements. Atoms cannot be created or destroyed. Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms...

(b)valency:-the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.

valency of carbon:-4

valency of helium:-0