1. If the molar mass of Na2SO4•nH2O is 304.04 g/mol, what is the hydration number 'n'?
A. 8
B. 10
C. 9
D. 7
2. What is the formula for the compound copper (II) sulfate pentahydrate?
3.Hydrates are formed with compounds
A. covalent
B. ionic
C. None of these
D. metallic

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

a) the particles of the chair are strongly held together.