Multiple Choice (1 Viewer)

xmichaelpham

New Member
Joined
Nov 1, 2012
Messages
8
Gender
Undisclosed
HSC
2012
1. B
2. D
3. A
4. C
5. B
6. C
7. D
8. D
9. B
10. B
11. B
12. D
13. D
14. A
15. C
16. A
17. C
18. C
19. A
20. A

Q12 is definitely D, the prefixes are order in alphabetical order but the numbers are where most electronegative is given lowest number.

ya this is what I think its all right
 

Kimyia

Active Member
Joined
Oct 21, 2011
Messages
1,013
Gender
Female
HSC
2012
Uni Grad
2016
I thought the multiple choice was ok, but I can't remember what I put down so in saying that, I could have got them all wrong haha :D
 

Zeroes

Member
Joined
Jan 13, 2010
Messages
263
Location
Sydney
Gender
Female
HSC
2012
I had 5 Bs in a row somewhere :| wooooooops
 
Last edited:

kdizzler

New Member
Joined
May 4, 2012
Messages
11
Gender
Male
HSC
2012
Your right, most electronegative goes first if both sides are equal lowest first number, and sum of numbers
 

deswa

Member
Joined
Oct 25, 2012
Messages
34
Gender
Male
HSC
2012
1. B
2. D
3. A
4. C
5. B
6. C
7. D
8. D
9. B
10. B
11. B
12. D
13. D
14. A
15. C
16. A
17. C
18. C
19. A
20. A

Q12 is definitely D, the prefixes are order in alphabetical order but the numbers are where most electronegative is given lowest number.
Yep got all this except I put A for 13 though I had no clue so I'm probs wrong. I'm pretty sure IUPAC changed naming laws in 2005 so electronegativity no longer applies but I put D anyway. Wouldn't be surprised to see question removed imo
 
Joined
Jan 16, 2012
Messages
51
Gender
Male
HSC
2012
Fuck yes. Pretty sure I got 100% in multiple choice (went over w/ teacher after exam)
Here are answers I got in order.
B
D
A
C
B
C
C
D
B
B
B
D
D
A
C
A
C
C
A
A

Can we get a consensus on what was the correct 100% answers? Fairly sure the above is right.
Mine's pretty similar, except for:
7-D --> isn't bromothymol blue green in between 6 and 7.6??
16-B --> Wasn't the undotted line H2, cos they're are more mols of H2 in the eqn?? So doesn't that make it CO that is added?
17-A --> Had no idea how to do it. Guessed it, knew I'd get it wrong- I suck at guessing haha
 

someth1ng

Retired Nov '14
Joined
Sep 18, 2010
Messages
5,558
Location
Adelaide, Australia
Gender
Male
HSC
2012
Uni Grad
2021
Yep got all this except I put A for 13 though I had no clue so I'm probs wrong. I'm pretty sure IUPAC changed naming laws in 2005 so electronegativity no longer applies but I put D anyway. Wouldn't be surprised to see question removed imo
Yeah, but either way, the most correct is D. The names are in alphabetical order and numbers can be technically correct - at least you'd understand it.
 

maths lover

Member
Joined
Feb 22, 2011
Messages
292
Gender
Male
HSC
2012
1. B
2. D
3. A
4. C
5. B
6. C
7. D
8. D
9. B
10. B
11. B
12. D
13. D
14. A
15. C
16. A
17. C
18. C
19. A
20. A

Q12 is definitely D, the prefixes are order in alphabetical order but the numbers are where most electronegative is given lowest number.
i got the exact same but im pretty sure that 13 is b. cr had a charge of +6 and went to +3 therefore is an oxidizing agent?, well atleast the naswer is between b and d.
 

traiwit

Member
Joined
Nov 11, 2011
Messages
243
Gender
Male
HSC
2012
Uni Grad
2016
i got the exact same but im pretty sure that 13 is b. cr had a charge of +6 and went to +3 therefore is an oxidizing agent?, well atleast the naswer is between b and d.
That is a product after reduced
 

maths lover

Member
Joined
Feb 22, 2011
Messages
292
Gender
Male
HSC
2012
Nah, it's D. Oxidising agent must be a reactant.
i dont think so, it can be the element itself as well, in fact i dont think its correct in saying the compound is being reduced as it is strictly the chromium ion that is being reduced.
 

someth1ng

Retired Nov '14
Joined
Sep 18, 2010
Messages
5,558
Location
Adelaide, Australia
Gender
Male
HSC
2012
Uni Grad
2021
i dont think so, it can be the element itself as well, in fact i dont think its correct in saying the compound is being reduced as it is strictly the chromium ion that is being reduced.
It asked for the oxidising agent in the reaction. I don't think it's possible to have an oxidising agent of a reaction as a product.

Anyway, it was originally Cr6+ and became Cr3+

.'. It gained electron and hence, was REDUCED.

.'. It is the oxidising agent.
 
Last edited:

Sindivyn

Member
Joined
Mar 4, 2012
Messages
194
Gender
Male
HSC
2012
Aside from Q12, anyone want to explain to me why my answers are wrong? (Posted on the front page, seem to disagree with most answers on a few q's)
 

Ant2511

New Member
Joined
Aug 1, 2012
Messages
23
Gender
Female
HSC
2012
Fuck yes. Pretty sure I got 100% in multiple choice (went over w/ teacher after exam)
Here are answers I got in order.
B
D
A
C
B
C
C
D
B
B
B
D
D
A
C
A
C
C
A
A

Can we get a consensus on what was the correct 100% answers? Fairly sure the above is right.
Hey bro I got A for question 11 :/
 

habitres

Member
Joined
Nov 18, 2011
Messages
110
Location
NSW
Gender
Male
HSC
2012
why is 11 B
Due to the fact that citric acid is triprotic, thus while being a weak acid similar to acetic acid, will donate 3* the H+ ion's and hence have a lower pH than acetic acid.
 

Rawf

Member
Joined
May 16, 2012
Messages
715
Gender
Undisclosed
HSC
2012
Far out, by the looks of it i only got 18/20 for MC
I totally misread the question about the equip needed to make a primary standard solution and put the ans with 'pipette, burette and conical flask' and misunderstood the degree of ionisation when adding H2O to CH3COOH <_< I put it would decrease - i thought like.. with the water present it couldn't completely ionise in water and if you add more it wouldn't do anything so then the degree (% of ionisation) decreases lol fail.
Overall, I thought the MC was a bit tricky this time, the calculations and all were quite easy in it though.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top