Question

48. As the number of carbon atoms increases in n-alkanes, so does their boiling point. (T/F)

49. What is the oxidation state of the underlined atom in the reaction:

A. 0

B. +2

C. -2

D. +4

E. -4

55. Ca2+(aq)+2Na(s)→Ca(s)+2Na+(aq) is a spontaneous reaction.

Activity Series =

Li(s)→Li+(aq)e−

K(s)→K+(aq)+e−

Ca(s)→Ca2+(aq)+2e−

Na(s)→Na+(​aq)+e-

Answer 1

Qs 48

TRUE

As the nuber of carbon atoms in n-alkanes increases, its boiling point increases. This is because, an increase in the number of carbon atoms means an increase in the molecular weight of the alkane. The size of the chain increases and this increases the van der waals force of attraction between the atoms. As the attractive forces increase, more energy is required to break these bonds. Thus, boiling point increases.

Qs 49

The underlined atom of a compound is missing. Kindly post it in the comment section. I will answer this qusetion :)

Qs. 55

This is a spontaineous reaction. This is becuase, Na is higher up in the activity series as compared to Ca.

The redox reactions are: