Question

5
ptes
ter-7
7-8
Q.3 Answer in one word -
a) Name the process which us used to separate Cream from the
milk.
b) Write the Chemical formula of Calcuim hydroxide
c) An element X has mass number 4 and atomic no. 2. Write the
Valency of this element
d) What is called Suicidal bag ?
e) Give an example of Simple harmonic Motion?
​

Answer 1

Answer:

A) Centrifugation

B) Ca(OH)2.

C) If the atomic number is 2, then the number of valence electrons are 2. Therefore, the electronic configuration is 2, which is a stable and fully filled. Thus, it does not involve in bond formation and valency is zero.

D)