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Chemistry - Class 12

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82 Views

Y chromosome is less active why

Preetam Bhowmik 5th Dec, 2021

Dear Aspirant, since Y-chromosome possesses small amount of euchromatin that contains DNA or genes, therefore it is genetically less active. Recent research has shown that the Y chromosome has developed some pretty convincing mechanisms to "put the brakes on", slowing the rate of gene loss to a possible standstill. I hope you are clear now. If you have any other doubts feel free to ask. All The Best!!!

58 Views

the standard heat of formation C2H4 , CO2 , H2O are -21.1,-94.1,-68.3 kk. calculate standard hest of combination of C2H4

Ayush 14th Sep, 2021

Hello candidate,

The standard heat of formation refers to the addition of all the individual specific heat of enthalpy for individual component and placing it in a balanced way so that the it leads to a balanced chemical reaction. So, the addition of carbon dioxide and water in appropriate proportions give rise to the formation of methane and upon calculation the heat of formation comes out to be 8.7 kk.

Hope you found it helpful. If you have any further queries feel free to post it here!!

393 Views

atomic number of copper...........

rajeevanand843 11th Sep, 2021

Hello

copper, a transition metal with chemical symbol Cu and atomic number 29. Copper participates in chemical reactions via a wide range of oxidation numbers from -2 to +4 but most commonly is found in organic cuprous and cupric complexes with oxidation states of +1 and +2, respectively.

Atomic mass: 63.546 u

Symbol: Cu

Electron configuration: [Ar] 3d¹4s¹

Number of Protons: 29

Number of Neutrons: 35

Number of Electrons: 29

hope this information helps you

all the best!!


1344 Views

Is elevation in boiling point is directly proportional to molarity? True or False

shikha jindal 30th Aug, 2021

The answer is true.The boiling point of a solvent will increase when a solute is dissolved in it.This is referred to as boiling point elevation.The elevation of the boiling point is directly dependent on the amount of solute present in the solution,but it is not based on the identity of the solute,so it is considered a colligative property.

40 Views

I want July shift all papers with key

Supriya Omi 2nd Aug, 2021
Hello there!
Kindly mention as for what exam you are asking the key. You mentioned class 12th chemistry. So as for that go through the ten years book and even consult your teachers and seniors for the same.
And if it is something different, then kindly mention.
Good Luck!
137 Views

how to study n remember inorganic for neet?i cannot predict trends inspite of doing basic chaps,all mcqs getting incorrect...

Anushri Varshney 13th Jul, 2021

Greetings of the day dear candidate!

Inorganic chemistry is indeed the most difficult yet easy for some people due to its easy understanding of chapters but no doubt the questions that came from these portions are a bit tricky. Also, the issue of forgetting the reaction and compound names are a bit difficult. No need to worry about this as it is common among many students. The NEET is going to be held on 12th September 2021.

So, I would suggest you follow these steps for 3-4 weeks, If it works for you I would be very grateful.

  • Try to start your day with the Inorganic chemistry portion.
  • Revise the concepts of compounds and characteristics along with trends.
  • Make some short notes of each unit that consist most important topic especially the reactions and naming.
  • Try to learn the compound by drawing their shapes. It will help you in realizing more.
  • Daily revise one unit and solve questions accordingly. After that analyze where you are lagging.

Also, do not forget to make flashcards as they will be very helpful in last-minute revision.

Prepare well and maintain your health.

Wishing you very good luck :)

391 Views

how many and which questions were repeated in neet 2020?

chandni deb 28th Jun, 2021

Dear Aspirant,

the repeated questions for NEET examinations are generally in most cases low, as the level of competition is very high. In most cases similar kinds of questions are asked instead of repeating the same question. However, there are a few times where a question or two are repeated from the previous years. Hence to get to know of some of these repeated questions or similar questions that are asked through out the year in NEET, you may solve the previous years question papers. They are very beneficial as it not only gives you an idea of the similar questions but also helps you get familiar with question paper pattern.

To view the previous years question papers, kindly visit the link provided below.

https://medicine.careers360.com/articles/neet-question-paper

241 Views

how to study chemical kinetics for neet?icant solve numericals as they get incorrect...

Anushri Varshney 25th Jun, 2021

Hello dear,

Chemical kinetics is the toughest for some people and also the easiest chapters in Chemistry class 12th. I think some concepts are not clear to you that's why you are lagging in this chapter. Understand the concepts clearly the reactions: first order, second order and third order. Most questions come from this part and also some half life-related questions.

You should read and revise the whole chapter once again or you can follow PHYSICS WALLAH for chemical kinetics. I am sure you will understand it more precisely.

Hope you understand. Revert for any query.

Good luck:)

80 Views

What is coagulation? Explain with example.

susanna.maryb 17th Jun, 2021

Hello Aspirant,

The best example of coagulation is the clotting of blood. When you have cuts or wounds you can observe that it turns viscous or semi solid from it's usual liquid state. This is to prevent excessive blood loss from the body. This is what coagulation refers to with respect to medical science. However, if you are referring to coagulation in a general sense most times it is referring to a process in water treatment. Coagulants like Alum are used to purify water. These substance helps remove suspended impurities which cannot be removed by straining/filtration. Hope this helps

67 Views

what is alkyle?how much 10 type of the halide?

Rishika Dutta 21st Jun, 2021

Hello,

First of all please write your questions in a proper manner. It is Alkyne,not Alkyle. I understood thr first part of your question, so i would like to answer it.

Alkyne is an unsaturated hydrocarbon,having atleast 1 Carbon - carbon triple bond.

General formula for alkynes is CnH2n-2.

Second,part of your question isn't clear,so kindly write it properly from next time.

ALL THE BEST.

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