GROUP IIIA - 3A

Question 1

Group 3A gives rise to?

Answer 1

Alum

Question 2

Exists in how many oxidation state?

Answer 2

+3

Question 3

What are the three true alums?

Answer 3

Ammonium alum
Potassium alum
Ferric alum

Question 4

Boron the only element with less than how many electrons ___________ and its
valence shell which is not a__________

Answer 4

4, metal

Question 5

Atomic no. of Boron

Answer 5

5

Question 6

Atomic weight of Boron

Answer 6

10.811

Question 7

Uses of Boron

Answer 7

Vulcanizing rubber and decreasing coefficient of expansion of glass

Question 8

Boric Acid chemical formula

Answer 8

H3BO3

Question 9

Boric Acid other name

Answer 9

1. Sal sedativum hombergi
2. Sal sativum
3. Boracic acid

Question 10

Identification test of Boric Acid

Answer 10

Ignition test = Green bordered flame

Turmeric Paper Test

Question 11

Uses of Boric acid

Answer 11

Used in ophthalmic preparations:
1. Buffer component
2. Bacterio-static eyewash
(Inhibits bacteria)
2.Antiseptic (Borofax 1-2%)

Question 12

Toxicity of Boric acid

Answer 12

Abdominal as well as local effects on the skin

Question 13

Antidote of Boric acid

Answer 13

Remove it by washing the area thoroughly

Question 14

Chemical Formula of Borax

Answer 14

Na2B4O54·8H2O

Question 15

Other names/common names of Borax

Answer 15

● Sodium borate
● Tincal
● Tincar

Question 16

Identification test for Borax

Answer 16

1. Alkaline indicator ● brownish red color

Question 17

Uses of Borax

Answer 17

● Wet dressings for wounds.
● Component of cold
creams(commonly
known as make up
removers, smoothens
skins)