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GATE BT-2017 Answer Key | Solutions Discussion - Printable Version

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RE: GATE BT-2017 Answer Key | Solutions Discussion - sadaf188 - 03-01-2017

(03-01-2017, 08:49 PM)SunilNagpal Wrote:
(03-01-2017, 08:38 PM)Santhosh Ram Wrote: can it be challenged?
Yes it can be challenged
Sir the unit of k is correct....for zero order reaction.... k is Mole/sec...
[Image: 267f0f19f20849a688abe7f233e76d88.jpg]

GATE BT-2017 Answer Key | Solutions Discussion - sadaf188 - 03-01-2017

[Image: c202bfae285c178b77d71122ac759c27.jpg]

Infact the formula used is....A0-A=kt
Where A0 has the unit moles....A is final conc which is zero.

RE: GATE BT-2017 Answer Key | Solutions Discussion - SunilNagpal - 03-01-2017

(03-01-2017, 10:05 PM)sadaf188 Wrote:
(03-01-2017, 08:49 PM)SunilNagpal Wrote: Yes it can be challenged
Sir the unit of k is correct....for zero order reaction.... k is Mole/sec...
[Image: 267f0f19f20849a688abe7f233e76d88.jpg]
It's mole per litre per sec or M per sec ... not mole per sec.. unit of k in question was wrong..

RE: GATE BT-2017 Answer Key | Solutions Discussion - sadaf188 - 03-01-2017

(03-01-2017, 10:26 PM)SunilNagpal Wrote:
(03-01-2017, 10:05 PM)sadaf188 Wrote: Sir the unit of k is correct....for zero order reaction.... k is Mole/sec...
[Image: 267f0f19f20849a688abe7f233e76d88.jpg]
It's mole per litre per sec or M per sec ... not mole per sec
Yes sir

But d formula used should be ,....A0-A=kt

RE: GATE BT-2017 Answer Key | Solutions Discussion - SunilNagpal - 03-01-2017

(03-01-2017, 10:24 PM)sadaf188 Wrote: [Image: c202bfae285c178b77d71122ac759c27.jpg]

Infact the formula used is....A0-A=kt
Where A0 has the unit moles....A is final conc which is zero.
sadaf, concentration is in Molar terms which is moles per litre...if one says conc. of A is 1M then it is moles per litre.

Similarly, k is expected to have units in M per sec or min (or moles per litre per min)

RE: GATE BT-2017 Answer Key | Solutions Discussion - sadaf188 - 03-01-2017

(03-01-2017, 10:32 PM)SunilNagpal Wrote:
(03-01-2017, 10:24 PM)sadaf188 Wrote: [Image: c202bfae285c178b77d71122ac759c27.jpg]

Infact the formula used is....A0-A=kt
Where A0 has the unit moles....A is final conc which is zero.
sadaf, concentration is in Molar terms which is moles per litre...if one says conc. of A is 1M then it is moles per litre.

Similarly, k is expected to have units in M per sec or min (or moles per litre per min)
Yes sir I know that M means moles/liter
But d formula that can fit is A0-A=kt
Where A is in moles nd k in moles/min?
If so....the answer will be 10000
So this can be challenged...right?

RE: GATE BT-2017 Answer Key | Solutions Discussion - sadaf188 - 03-01-2017

Sunil sir plz help me wid question no. 16 also.

RE: GATE BT-2017 Answer Key | Solutions Discussion - travellingsalesman - 03-01-2017

(03-01-2017, 08:49 PM)SunilNagpal Wrote:
(03-01-2017, 08:38 PM)Santhosh Ram Wrote: can it be challenged?
Yes it can be challenged

Right Bro. It should have been either in grams/milligrams(i.e - mg/min) or  M(molarity). Fell for the same trap. I thought, I was the only one. 


If someone challenges it, gets it right will everyone with that answer be awarded.

What about that plasmid question. There is no xho1 site in MCS or any part of plasmid?

RE: GATE BT-2017 Answer Key | Solutions Discussion - SunilNagpal - 03-01-2017

(03-01-2017, 10:35 PM)sadaf188 Wrote:
(03-01-2017, 10:32 PM)SunilNagpal Wrote: sadaf, concentration is in Molar terms which is moles per litre...if one says conc. of A is 1M then it is moles per litre.

Similarly, k is expected to have units in M per sec or min (or moles per litre per min)
Yes sir I know that M means moles/liter
But d formula that can fit is A0-A=kt
Where A is in moles nd k in moles/min?
If so....the answer will be 10000
So this can be challenged...right?
One need not challenge on the basis of fitting values of A and Ao in terms of moles (as it is the norm to use concentration of reactants in the classical equation).

This question can simply be challenged on the basis of unitary approach, supported by the fact that unit of k leads to imbalance of units on reactant n product sides (if one tries to follow the approach used for obtaining 100 mins as solution).

RE: GATE BT-2017 Answer Key | Solutions Discussion - sadaf188 - 03-01-2017

(03-01-2017, 10:47 PM)SunilNagpal Wrote:
(03-01-2017, 10:35 PM)sadaf188 Wrote: Yes sir I know that M means moles/liter
But d formula that can fit is A0-A=kt
Where A is in moles nd k in moles/min?
If so....the answer will be 10000
So this can be challenged...right?
One need not challenge on the basis of fitting values of A and Ao in terms of moles (as it is the norm to use concentration of reactants in the classical equation).

This question can simply be challenged on the basis of unitary approach, supported by the fact that unit of k leads to imbalance of units on reactant n product sides (if one tries to follow the approach used for obtaining 100 mins as solution).
OK thank u so much sir.....

Sir plz ques no. 16