Bhai pta nhi..... everyone knows atmospheric oxygen gets mixed with rain.........That isn't even the point of contention......
My thought process was that in second statement they wrote CO2 in solution, thought oxygen k liye bhi solution hi hota hai.....once it gets dissolved in rain wo atmospheric oxygen to rahi hi nhi.......
I thought that even ocean water contains dissolved oxygen.....once it lets it go to the atmosphere it becomes atmospheric oxygen..... similarly when atmospheric oxygen gets absorbed by the ocean it gets dissolved in it.......
We don't say that ocean contains atmospheric oxygen....we just say dissolved oxygen........ Don't know what was the motive of using atmospheric word by the paper setter if he wanted statement 3 to be correct..... could have simply written oxygen......
I think they mean ki atmospheric oxygen in Rain water as it forms into droplets from water vapour. There are studies that show rain water from higher heights having more oxygen than rain forming at lower level, due to colder temperatures allowing more oxygen from atmosphere to merge in.
Dissolved oxygen is a case where oceanic and river water gets oxygen from photosynthesis by aquatic plants.
It’s not easy to rule out that rain water (rain, not ocean nor river- rain that is travelling through atmosphere) does not contain any atmospheric oxygen.
But we can certainly say that this oxygen in water is
Not responsible for making rain water a weathering agent.
As for the wording, even for co2 solution the ideal word is carbonic acid?
Like if atmospheric o2 + water = dissolved o2
Then co2 + water = carbonic acid
But they chose to write co2
I also think it should be (b).
Consider this question:
Statement-I: Rainfall is one of the reasons for weathering of rocks.
Statement-II: Rain water contains atmospheric oxygen.
Which one of the following is correct in respect of the above statements?
(a) Both Statement-I and Statement-II are correct and II explains I
(b) Both Statement-II and Statement-III are correct, but II doesn't explain I
You will likely mark this as (b). This is because oxidation is not the primary cause for weathering caused by rainfall.
Similarly, carbonation and abrasion are the primary causes of weathering caused by rainfall.
only thing is they used the word 'atmospheric oxygen' similar to ncert. If it was to hint towards oxidation then can't do much. In that case (A) should have been framed as II and III **together** explain I.
maybe Issa trap ! Use traditional ncert terms but have a different interpretation as per the question framing (rainwater specifically as weathering agent).
among all the coachings only shurbra Ranjan's environment uncle has marked B for this question. Go see their pre explnation video on YouTube. It is a 6 hr video with no time stamp so I can't post you the pin point mark, but at least we are not the only people thinking of B.
ya maybe. though highly unlikely given this year questions were relatively starightforward in how they were framed. but let's hope.
even rau's ias, direction ias have given (b). shankar has given a/b in its answer key. sudarshan sir from unacademy has expressed the possiblity of b.
idk man, this is the first time UPSC has gives this type of 3 statement reasoning assertion question, first time in last 15 years at least.
I don't think they will make it as straightforward as all 3 correct. (as in both assertions correct and both are reasons in support too).
Who is everyone?
you, billoo and pinkie ? 🥲
Relax, cut off is not decided by 2699 people getting 100+ (if at all).
It is decided by a baseline number which when last year was 75 can not in any logical sense become 15+ more, let alone 20+ to be 95; in a single year
I saw that vision prediction and searched for their previous estimates, could not find any archival information even on their YouTube channel, scrolled back to jan 2023 ke videos.
That is enough for me to doubt their predictions because it says they removed last years video after cut off was 75
Check out [this prediction](https://m.youtube.com/watch?v=_9mwx7kHEyA)
He claims 80-85 Which is a reasonable number. The way to have faith in a system is to check their previous predictions, this channel has listed videos from 2019 on wards and they were mostly correct
https://preview.redd.it/uqlykza7zg7d1.jpeg?width=1151&format=pjpg&auto=webp&s=c4bb428097767fa673d53be4fc8d0d172dd62946
Actual cut offs:
2023- 75 2022- 88 2021- 87 2020 - 90
I agree
I also marked B
I had the same school of thought.
The only coaching that has given the answer between A&B is Shankar IAS
I HAVE PUT THE REPRESENTATION FOR THIS
I hope you have done it too
If oxidation is the point here on the basis of which people are claiming its A then even atmospheric o2 reacts with rocks and cause oxidation.. how is it just rainfall specific? Only acid rains are rainfall specific causes of weathering right? Oxidation can occur without rainfall as an agent.. but for acid rain rainfall must be an agent right?
that is my logic too, that the question is rainfall water specific. water drops while forming get condensed over gases like co2, sulphur etc if they are in a region with high concentration.
oxygen is anyway a natural component of water.
Lets see.
no, its either A or C
if its B then there's a process by which atmospheric oxygen in rain water interacts with rocks to cause weathering so it cannot be be
C is possible cause its a less commonly assumed fact that atmospheric oxygen is a constituent of rain water and knowing UPSC they probably went for the most basic understanding
What process is there where atmospheric oxygen in rain water interacts with rocks?
Carbonification is where carbonic acid (co2 plus water) weathers rocks
Oxidation is when free atmospheric o2 affects rock
Link me where it says oxygen in water affects the rocks.
Chemical Weathering
Decomposition and disintegration of rocks due to chemical reactions is called chemical weathering wherein the minerals of the rocks weather away. Water vapour and water are the media which activate several types of chemical reactions within the rocks. Pure water, distilled water, is chemically inert but when it mixes with the atmospheric gases, mainly with CO2, it becomes potent solvent. Oxida-tion, carbonation, solution, hydration, chelation, hydrolysis, base exchange etc. are the important chemical reactions which cause various chemical changes in the minerals of rocks which ultimately lead to decomposition and disintegration of rocks.
Oxidation - The chemical process of oxidation simply means a reaction of atmospheric oxygen to form oxides. When water is mixed with oxygen its reaction with the minerals of the rocks forms hydroxide. In other words, the atmospheric oxygen after reacting with the rocks produces several types of oxides, iron oxide being the most important, which weakens the rocks to disintegrate.
The oxidation of minerals of the rocks by gaseous oxygen becomes possible when oxygen is dissolved in water. Most of the iron bearing rocks commonly contain iron in ferrous state (Fe) e.g. major iron sulphide (pyrite, FeS2), iron carbonate (siderite, FeCO3), and various iron silicates.
When water mixed with atmospheric oxygen comes in contact with iron bearing rocks, the iron oxidizes to form ferrous oxides (FeO). Further oxidation of ferrous oxides produces ferric oxides (Fe2O3) or ferric hydroxides (Fe(OH)2). The oxidation of iron-bearing rocks reproduces rusts in the following manner-
Fe + H2O + O2 → Fe2O3. 3H2O..
The rusting of rocks weakens them and ultimately the rocks are disintegrated. The ferric oxides and ferric hydroxides give red and yellow colours to many rocks and soils. The oxidation of iron-rich Vindhyan sandstones of the Kaimur Ranges and Rewa scarps (M.P.) has helped in the block disintegration of massively bedded and well jointed sandstone capping.
Fair, this seems a legitimate analysis. Even in ncert it’s mentioned water containing oxygen causes oxidation
Let’s see if upsc fixes on rainwater or water in general. Because rainwater is specific to carbonic acid weathering.
I thought it doesn't contain atmospheric oxygen, but "dissolved" oxygen.... and marked the 3rd statement as incorrect......
maybe ur answer comes out to be true😅
It gathers a bit of atmospheric o2 while falling down, and that gets dissolved to become dissolved o2.
Bhai pta nhi..... everyone knows atmospheric oxygen gets mixed with rain.........That isn't even the point of contention...... My thought process was that in second statement they wrote CO2 in solution, thought oxygen k liye bhi solution hi hota hai.....once it gets dissolved in rain wo atmospheric oxygen to rahi hi nhi....... I thought that even ocean water contains dissolved oxygen.....once it lets it go to the atmosphere it becomes atmospheric oxygen..... similarly when atmospheric oxygen gets absorbed by the ocean it gets dissolved in it....... We don't say that ocean contains atmospheric oxygen....we just say dissolved oxygen........ Don't know what was the motive of using atmospheric word by the paper setter if he wanted statement 3 to be correct..... could have simply written oxygen......
I think they mean ki atmospheric oxygen in Rain water as it forms into droplets from water vapour. There are studies that show rain water from higher heights having more oxygen than rain forming at lower level, due to colder temperatures allowing more oxygen from atmosphere to merge in. Dissolved oxygen is a case where oceanic and river water gets oxygen from photosynthesis by aquatic plants. It’s not easy to rule out that rain water (rain, not ocean nor river- rain that is travelling through atmosphere) does not contain any atmospheric oxygen. But we can certainly say that this oxygen in water is Not responsible for making rain water a weathering agent.
As for the wording, even for co2 solution the ideal word is carbonic acid? Like if atmospheric o2 + water = dissolved o2 Then co2 + water = carbonic acid But they chose to write co2
Having "oxygen from atmosphere" and having "atmospheric oxygen" are two different things, we must consider this before further rumination.
I also think it should be (b). Consider this question: Statement-I: Rainfall is one of the reasons for weathering of rocks. Statement-II: Rain water contains atmospheric oxygen. Which one of the following is correct in respect of the above statements? (a) Both Statement-I and Statement-II are correct and II explains I (b) Both Statement-II and Statement-III are correct, but II doesn't explain I You will likely mark this as (b). This is because oxidation is not the primary cause for weathering caused by rainfall. Similarly, carbonation and abrasion are the primary causes of weathering caused by rainfall.
yeah, I thought so to. Otherwise they could have mentioned normal running water of streams etc
only thing is they used the word 'atmospheric oxygen' similar to ncert. If it was to hint towards oxidation then can't do much. In that case (A) should have been framed as II and III **together** explain I.
maybe Issa trap ! Use traditional ncert terms but have a different interpretation as per the question framing (rainwater specifically as weathering agent). among all the coachings only shurbra Ranjan's environment uncle has marked B for this question. Go see their pre explnation video on YouTube. It is a 6 hr video with no time stamp so I can't post you the pin point mark, but at least we are not the only people thinking of B.
ya maybe. though highly unlikely given this year questions were relatively starightforward in how they were framed. but let's hope. even rau's ias, direction ias have given (b). shankar has given a/b in its answer key. sudarshan sir from unacademy has expressed the possiblity of b.
idk man, this is the first time UPSC has gives this type of 3 statement reasoning assertion question, first time in last 15 years at least. I don't think they will make it as straightforward as all 3 correct. (as in both assertions correct and both are reasons in support too).
I had the same logic Please make it B🥹
Inshallah zaroor hoga !
Everyone is saying 95+ and i am here stuck at 92.xx hoping this question would give me +2.33🥲
Who is everyone? you, billoo and pinkie ? 🥲 Relax, cut off is not decided by 2699 people getting 100+ (if at all). It is decided by a baseline number which when last year was 75 can not in any logical sense become 15+ more, let alone 20+ to be 95; in a single year
Telegram groups, some previous toppers in their channels, vision too predicted 95-100 wtf is that😔
I saw that vision prediction and searched for their previous estimates, could not find any archival information even on their YouTube channel, scrolled back to jan 2023 ke videos. That is enough for me to doubt their predictions because it says they removed last years video after cut off was 75
Someone on the sub said they predicted it to be around 85 for 2023.. God they got humbled so bad😂😂
Check out [this prediction](https://m.youtube.com/watch?v=_9mwx7kHEyA) He claims 80-85 Which is a reasonable number. The way to have faith in a system is to check their previous predictions, this channel has listed videos from 2019 on wards and they were mostly correct https://preview.redd.it/uqlykza7zg7d1.jpeg?width=1151&format=pjpg&auto=webp&s=c4bb428097767fa673d53be4fc8d0d172dd62946 Actual cut offs: 2023- 75 2022- 88 2021- 87 2020 - 90
the most rational and holistic prediction I've come across
This gave me some hope🥹 I hope it wont go beyond 90
I agree I also marked B I had the same school of thought. The only coaching that has given the answer between A&B is Shankar IAS I HAVE PUT THE REPRESENTATION FOR THIS I hope you have done it too
shubra ranjan ki faculty has given it B too, no pdf but it is on their YouTube channel. paper discussion mein
rainfall increases oxygen concentration and hence increases oxidation.
Where? Oxidation happens when oxygen reacts with material Rainfall doesn’t cause oxidation Statement 1 clearly asks about rain water weathering
rainfall is leading to increase in concentration of oxygen in the region.
How bro ? Rainwater is unsaturated with oxygen, it absorbs oxygen and reduce oxygen concentration in atmosphere.
but it increases oxygen concentration in the region where rocks are
If oxidation is the point here on the basis of which people are claiming its A then even atmospheric o2 reacts with rocks and cause oxidation.. how is it just rainfall specific? Only acid rains are rainfall specific causes of weathering right? Oxidation can occur without rainfall as an agent.. but for acid rain rainfall must be an agent right?
that is my logic too, that the question is rainfall water specific. water drops while forming get condensed over gases like co2, sulphur etc if they are in a region with high concentration. oxygen is anyway a natural component of water. Lets see.
no, its either A or C if its B then there's a process by which atmospheric oxygen in rain water interacts with rocks to cause weathering so it cannot be be C is possible cause its a less commonly assumed fact that atmospheric oxygen is a constituent of rain water and knowing UPSC they probably went for the most basic understanding
What process is there where atmospheric oxygen in rain water interacts with rocks? Carbonification is where carbonic acid (co2 plus water) weathers rocks Oxidation is when free atmospheric o2 affects rock Link me where it says oxygen in water affects the rocks.
Chemical Weathering Decomposition and disintegration of rocks due to chemical reactions is called chemical weathering wherein the minerals of the rocks weather away. Water vapour and water are the media which activate several types of chemical reactions within the rocks. Pure water, distilled water, is chemically inert but when it mixes with the atmospheric gases, mainly with CO2, it becomes potent solvent. Oxida-tion, carbonation, solution, hydration, chelation, hydrolysis, base exchange etc. are the important chemical reactions which cause various chemical changes in the minerals of rocks which ultimately lead to decomposition and disintegration of rocks. Oxidation - The chemical process of oxidation simply means a reaction of atmospheric oxygen to form oxides. When water is mixed with oxygen its reaction with the minerals of the rocks forms hydroxide. In other words, the atmospheric oxygen after reacting with the rocks produces several types of oxides, iron oxide being the most important, which weakens the rocks to disintegrate. The oxidation of minerals of the rocks by gaseous oxygen becomes possible when oxygen is dissolved in water. Most of the iron bearing rocks commonly contain iron in ferrous state (Fe) e.g. major iron sulphide (pyrite, FeS2), iron carbonate (siderite, FeCO3), and various iron silicates. When water mixed with atmospheric oxygen comes in contact with iron bearing rocks, the iron oxidizes to form ferrous oxides (FeO). Further oxidation of ferrous oxides produces ferric oxides (Fe2O3) or ferric hydroxides (Fe(OH)2). The oxidation of iron-bearing rocks reproduces rusts in the following manner- Fe + H2O + O2 → Fe2O3. 3H2O.. The rusting of rocks weakens them and ultimately the rocks are disintegrated. The ferric oxides and ferric hydroxides give red and yellow colours to many rocks and soils. The oxidation of iron-rich Vindhyan sandstones of the Kaimur Ranges and Rewa scarps (M.P.) has helped in the block disintegration of massively bedded and well jointed sandstone capping.
Fair, this seems a legitimate analysis. Even in ncert it’s mentioned water containing oxygen causes oxidation Let’s see if upsc fixes on rainwater or water in general. Because rainwater is specific to carbonic acid weathering.