Question

Which of the following statements concerning the manufacture of town gas in Hong Kong is/are correct?

(1)Town gas is produced from coal.
(2)Town gas contains hydrogen as the major component.
(3)Oxygen is added to enhance the flammability of town gas prior to its delievery to consumers.

A：(1) only
B：(2)only
C：(1) and (3) only
D：(2) and (3) only

I know the answer. Is the statement (3) correct? Why or why not?

Answer 1

so according to you C is correct?

Answer 2

No

Answer 3

second one is correct also

hydrogen is present in 50% composition in Coal gas ( town gas ) as per my info.

Answer 4

Actually, I'm asking if statement (3) is correct.

Answer 5

oh k

Answer 6

wait

Answer 7

i think 3 is not correct

as i think it is burnt in the absence of oxygen

Answer 8

I can't believe things can be burnt without oxygen..

Answer 9

(3) is nonsense

Answer 10

oxygen is added At consumption, along with a high temperate

Answer 11

But concerning town gas?

Answer 12

Actually, there are two questions for statement (3)
(a) Is oxygen added to town gas prior to its delievery to consumers?
(b) Is the purpose of adding oxygen to enhance the flammability of town gas?

Answer 13

a) is correct

Answer 14

what is town gas ?

Answer 15

coal gas @UnkleRhaukus

Answer 16

natural cola seam gas ?

Answer 17

i though so

Answer 18

I got it

Answer 19

Town gas, produced from naphtha and natural gas, is a clean, safe and reliable gaseous fuel.
Source: http://www.towngas.com/Eng/Corp/AbtTG/HKBus/Production.aspx

I didn't know it's natural cola seam gas or coal gas...

Answer 20

is not a clean industry at all

Answer 21

@Callisto the answer is a)

coal gas contains 5% of ethylene that is used to increase luminous flame

Answer 22

i ment coal not cola*

Answer 23

A：(1) only ?

Answer 24

Sorry!!! @UnkleRhaukus

Answer 25

no

Answer 26

im still deciding between (1) and (2)

Answer 27

wait

Answer 28

1) is correct
2) is also correct since hydrogen is present in 50% composition in coal gas
3) not correct

Answer 29

wow....

Answer 30

sarcastic mood? ;D but that is not in options

Answer 31

im not sure if produced is the right wording in (1)

Answer 32

I'm sure (1) is not correct.

Answer 33

Coal gas (also town gas and illumination gas) is a flammable gaseous fuel made by the destructive distillation of coal containing a variety of calorific gases including hydrogen, carbon monoxide, methane and volatile hydrocarbons together with small quantities of non-calorific gases such as carbon dioxide and nitrogen.

- wikipedia


1) is absolutely correct

Answer 34

but how r u sure @Callisto ?

Answer 35

produced from naphtha and natural gas <- both are from petroleum.
Also, don't forget I have the answer already.

Answer 36

hmn so finally 2) is correct if you r sure that 1) is not correct

Answer 37

how do fossil fule deposits work ,

Answer 38

As I mentioned before, I'm asking if (3) is correct, not (1) or (2).

Answer 39

It is wrong as per me..

Answer 40

*my info.

Answer 41

Explanations?

Answer 42

Ethylene is used for flammability of town gas not oxygen

Ethylene is present in 5% composition in coal gas..

Answer 43

http://www.towngas.com/Eng/Corp/AbtTG/HKBus/Production.aspx
Please refer to the site.

Answer 44

I'm sorry that I hid some words in the question. Look like I have to make it clearer...

Answer 45

that matters a lot callisto : hong kong

Answer 46

Question edited. Note that even though I'm a student here, I don't know the information related.

Answer 47

It's not mentioned in the book nor there is any hint in the question.

Answer 48

Wobbe Index 24.

Answer 49

Actually I am not sure that I can help you in this since I don't know about the condition in Hong Kong

Answer 50

I just said that even student here don't know the situation lol

Answer 51

lol

Answer 52

*students

Answer 53

http://www.towngas.com/Eng/Corp/AbtTG/HKBus/Production.aspx

this says all that we wanted :

1) Your main question... statement 3)... that is correct
2) "2)" is correct also... (but it is not asked by you)

Answer 54

Thanks for posting the same link again..( 3times in this post already)
Why is statement (3) correct?

Answer 55

statement 3 is correct

explanation : Nitrogen and Oxygen 0% – 3.3%

at least this shows that oxygen is present in coal gas..
In the given components there, oxygen is the best gas responsible for flammability.

Answer 56

that is my opinion...

Answer 57

Then, you're just assuming it's used to enhance flammability but not explaining it really.

Answer 58

"sorry", you must prefer a coal gas engineer :D

Answer 59

@vishweshshrimali5

Answer 60

Well @Callisto can u please give me a short summary what has happened till now

Answer 61

I don't know if statement (3) in the question is correct

Which of the following statements concerning the manufacture of town gas in Hong Kong is/are correct?

(1)Town gas is produced from coal.
(2)Town gas contains hydrogen as the major component.
(3)Oxygen is added to enhance the flammability of town gas prior to its delievery to consumers.

Answer 62

statement (3) is not correct.

oxygen is not added until burning

Answer 63

agree

Answer 64

Sure?

Answer 65

I think so ??
and even wiki thinks so

Answer 66

@vishweshshrimali5 leave wiki.. I hate it now .. :'( It is not so much reliable as per my info....

since acc. to it oxygen is not present in it but other site says it is

Answer 67

Oxygen is not present

Answer 68

But ones who set the exam paper don't think so.. @vishweshshrimali5

Answer 69

wiki is correct
it is prepared by destructive distillation that is heating in absence of oxygen

Answer 70

Why ?

Answer 71

that is what i tried to say @vishweshshrimali5

Answer 72

I don't know... That's why I asked.

Answer 73

You know the answer

Answer 74

It's D, I did mention I had the answer.

Answer 75

Impossible

Answer 76

Explanations?

Answer 77

I WON

Answer 78

Callisto I searched for it on internet

town gas also called as coal gas is obtained by destructive distillation of coal that is heating coal in absence of oxygen

Answer 79

though m not having perfect explanation for 3) as i am not living in hong kong :(

right vishwesh... wiki says that

Answer 80

but : http://www.towngas.com/Eng/Corp/AbtTG/HKBus/Production.aspx

Answer 81

@mathslover I'm really sorry to say it's not about winning.

Answer 82

No problem, it was a joke though

Answer 83

And also you cannot use that data to say it's added to enhance flammability, even though it might.

Answer 84

as I know that this is not a quiz or anything to win about.. and if I had correct explanation that i deserved that but I don't deserve to say "I won" ..

Answer 85

@Callisto is sometheing still left ?

Answer 86

You mean?

Answer 87

I mean have we got the answer

Answer 88

??

Answer 89

The answer is D.

Answer 90

I mean to say have you got that the answer D is wrong in fact

Answer 91

The answer is provided by the examination authority

Answer 92

sorry I can't compete with examination authority

they are subject experts

Answer 93

we have to accept their answer

Answer 94

So, the only option left is that I have to remember this fact without knowing the reasons behind?

Answer 95

yes :'(

first time I have to say that .............. sorry..... :'(

Answer 96

Sorry again

Answer 97

It's okay. It's not the first time I heard it after all though