Group 3A

Question 1

Oxidation state

Answer 1

+3

Question 2

Describe Boron

Answer 2

>lewis acid
>only metalloid in the group
>essential nutrient for plants
>involved in bone metabolism
>used in vulcanizing rubber

Question 3

H3BO3

Answer 3

-boric acid
-sal sativum
Uses:
*buffer
*antiseptic
*tonicity adjusting agent

Question 4

Toxicity of Boric Acid

Answer 4

Lobster appearance

Question 5

Sodium borate

Answer 5

-borax
-dobell sol’n
-na tetraborate
Uses:
*antiseptic
*eyewash
*wet dressing for wounds

Question 6

Describe aluminum

Answer 6

Most abundant of the metals.
Gastric antacids.
Used in antiperspirants and deodorant.

Question 7

Aluminum chloride hexahydrate

Answer 7

• astringent
• antiseptic
• antiperspirant/deodorant

Question 8

ALUM

Answer 8

Astringent

Antiperspirant/deodorant

Question 9

Aluminum hydroxide

Answer 9

-amphojel
-cremalin gel
Uses:
Antacid
Protectant
Disadvantage:
Constipation and phosphate deficiency

Question 10

Aluminum phosphate

Answer 10

-phosphagel
Uses:
Antacid
Astringent
Demulcent

Question 11

Aluminum carbonate

Answer 11

-alumina

Tx for Silicosis

Question 12

Kaolin

Answer 12

-china clay
-native hydrated aluminum silicate
Adsorbent in diarrhea

Question 13

Pumice

Answer 13

-amorphous Al silicate

Dental abrasive

Question 14

Bentonite

Answer 14

-soap clay
-mineral soap
Suspending agent

Question 15

Ga, In, Tl

Answer 15

Not for pharm use except isotopes: 
67Ga
111In
113In
201Tl

Question 16

Ga

Answer 16

Lowest melting point

Substitute for Hg in arc lamps

Question 17

Tl

Answer 17

Compounds are toxic

Used as insecticide

Question 18

Structure of this group

Answer 18

ns2p1