Suphur

Question 1

Define dibasic acid

Answer 1

acids with two replaceable h2 ions

Question 2

Justify as to why is the bleaching action of so2 is temporary?

Answer 2

It is since the reduced product regains it’s original color when exposed to air.

Question 3

List the Allotrophy of sulhpur

Answer 3

Rhombic sulphur
prismatic sulphur
plastic sulphur
milk of sulphur
collodial sulphur

Question 4

List the chemical properties of so2

Answer 4

Thermal decomposition: On strongheating to 1200c it decomposes into so3 and s

Combustibility: So2 isnt combustible but metals can burn in it’s atmosphere due to the generation of heat which causes thermal decomposition

Reducing property: SO2 tends to gain oxygen to form so3.

Oxidizing property: so2 contains two atoms of oxygen hence acting as an oxidizing agent with stronger reducing agent.

Acidic nature: So2 dissolves in water to give h2so3 .

Question 5

LIst the physical properties of so2

Answer 5

. it is colorless having a pungent odor of burning sulphur
. it is corrosive and poisonous
.It is highly soluble in water and heavier than air
. It is highly volatile gas, it has low freezing point of -76 degrees c, hence used for refirgeration

Question 6

Name the units of the h2so4 production by contact process

Answer 6

Pyrite burner, Dust removal Chamber, Cooler, Scrubber, Drying tower, Arsenic Purifier, Testing box, Pre-heater, Contact tower, Absorption Tower

Question 7

Physical Properties of H2so4

Answer 7

1. It is colorless, syrupy and hygroscopic
2. Pure h2so4 is a badconductor for electricity.
3. Conc. H2so4 fumes strongly in air
4. Highly corrosive

Question 8

State the main principle involved in the preparation of so2 gas in lab.

Answer 8

when copper turnings are heated with hot and conc, h2so4, so2 is formed.

Question 9

What are the favorable condition for the maximum yield of h2so4?

Answer 9

High concentration of oxygen
low temperature
high pressure
use of suitable catalyst
purity of gases

Question 10

What are the two main tests to identify so2 gas?

Answer 10

1. When so2 gas is contacted with filter paper soaked in sodium dichromate, then the paper turns green from orange
2. When so2 is contacted withwet litmus paper, it turns red from blue

Question 11

What happens when conc h2so4 contacts on skin?

Answer 11

THe h2so4 sucks the moisture out of the skin and enormous heat is generated from the reaction between the h2so4 and the moisture, with causes burning sensation and deep seated wounds

Question 12

what happens when gas obtained by heating copper and conc h2so4 is passed through chlorine water?

Answer 12

THe chlorine water oxidises the so2 into h2so4 and hcl

Question 13

What is allotrophy?

Answer 13

Allotrophy is the existence of an element in two or more than two forms in the same state with similar chemical properties but different physical properties.

Question 14

Why is dilute sulphuric acid not used in the preparation of so2?

Answer 14

Because dilute h2so4 produces cuso4+ h2 as reduction property of cu is higher than h2

Question 15

Chemical properties of h2so4

Answer 15

disassociation, acidic character, strong dehydrating agent, strong oxidizing agent, precipitating agent

Question 16

describe the disassociation process of h2so4

Answer 16

when heated h2so4 disassociates and converts into so3 and water

Question 17

describe the acidic character of h2so4

Answer 17

h2so4 in an aqueous solution, h2so4 ionizes in two steps and forms two series of salts: normal sulphates and acidic sulphates

Question 18

describe h2so4 as a dehydrating agent

Answer 18

conc h2so4 has strong affinity for water. Hence, with water, conc h2so4 forms a hydrate with high amt of heat

Question 19

List some examples of conc. h2so4 behaving as strong dehydrating agent

Answer 19

. charring of sugar

. Action of organic compound