TGT EXAM-2026 | CHEMISTRY | PRACTICE CLASS | BY UTKARSH SIR

[00:00:00]I welcome you Utkarsh Tiwari, Faculty of Chemistry. I am making you practice some questions for the upcoming TGT PGT exam.

[00:00:06]Then I will be in front of you with a new video tomorrow or day after tomorrow.

[00:00:10]Let's practice the questions. The first question is what is there in the nucleus of an atom? Proton neutron. Second proton electron third neutron electron. And the fourth is proton, neutron and electron. Ok? So the nucleus contains protons and neutrons.

[00:00:30]How is it? There are protons and neutrons. Ok? The next question that comes to you is what is present in cathode rays? Ok? There is only mass. There is only passion. There is no mass charge.

[00:00:45]Both mass and charge are present. Ok?

[00:00:48]What is present in cathode rays? Ok?

[00:00:51]So cathode rays have both mass and charge because they are made up of electrons.

[00:00:56]Ok? Next Who discovered the proton? The first option was Chadwick, Thomson, Goldstein or Bohr. So the proton was discovered by Goldstein.

[00:01:13]What is the next heaviest particle? remains a meson, neutron, proton or electron.

[00:01:18]Ok? So see, the mass of an electron is 9.1 * 10 power -31, its mass is 1.673 * 10 power -27 grams, its mass is 1.675 * 10 power -25 kg, its mass is also kg. So, who got the most? It's done with neutrons.

[00:01:50]Ok? Next comes who discovered anode rays? Goldstein, S. J. J. Stoney, Rutherford or J. Thomson?

[00:02:00]So who did it? Rutherford did it.

[00:02:05]Next, what is the density of the nucleus of an atom? What is the density of the nucleus of an atom? Ok? The first option is 2.4 * 10 to the power 15. The second one was [nasal sound] the second option is in front of you. 2.4 * 10 to the power 19 kg per meter. Ok? The third one is 2.4 * 10 to the power 17.

[00:02:34]Meter on KG okay? And the next one is 2.4 * 10 to the power 14. So its density is the highest, 2.4 * 10 to the power 17 kg per meter. Ok? The next question is who has determined the e /m ratio? Ok? Who invented the E/M ratio, J.J. Thomson, Doulton, Chadwick or Gould Steel?

[00:03:11]Who gave the ratio e/m? So the first option for E/A is JJ Thomson. The other is Doulton. The third one was given to us by Chadwick and the fourth one was given to us by Goldstein. Ok? So JJ Thomson had told about this. The ratio of A/M was described by JJ Thomson. Jai Hind children. The next question is which of the following pairs is correctly matched? Which of the following pair is not correctly matched is not correctly matched. Ok? Rutherford proton JJ Thomson electron Chadwick neutron and every isotope so Rutherford proton is fine.

[00:03:56]JJ Thomson electron is correct. James Chadwick Neutron is correct. That's every isotope.

[00:04:02]Ok? This is the only wrong one. Ok? Oh, answer the isotope question, son. Ok? Next comes Rutherford's experiment.

[00:04:12]Rutherford's experiment proves it.

[00:04:15]What does Rutherford's experiment prove?

[00:04:20]About electrons, protons, atoms or nuclei. So what are Rutherford's experiments mainly related to? from the nucleus. Who is he related to, son? from the nucleus.

[00:04:28]Keep replying. Ok? Rutherford's experiment proves about the nucleus. Next is the minimum real charge of any particle that exists. How much is the minimum? Ok? The minimum real charge that can exist on any particle. Ok?

[00:04:46]1.6 10 to the power -19 1.6 * 10 ^ -10 4.8 * 10 ^ -10 Okay? And with that zero, what would be the correct answer?

[00:05:02]Tell me quickly.

[00:05:06]Remember the minimum real charge is 1.6 * 10 to the power -19. How is it? 1.6 * 10 to the power -19 10th of a.

[00:05:19]Next we come.

[00:05:21]What is the number of neutrons in C12? 6 7 8 or nine remains. So look at atomic number six atomic weight so the number of neutrons will be equal to atomic weight minus atomic number is atomic weight. If the atomic number is 6, then what is the number of neutrons?

[00:05:41]Six. So what is the correct answer to this? It's six. Ok? How did the children answer this? Six. How much is it?

[00:05:49]So how did the atomic weight become -6? It's six. Ok? Next, let's talk about what is the most likely radius for finding electrons in He+? We have to tell the most probable radius of He+ in pico meter in PM. The most probable radius of the electron in He+ i.e. first shell is 0 52.9 26.5 or 105.8, so what is it? Remains 52.9. How much remains? 52.9 is our correct answer for 12th. The next six protons are found in its nucleus. Ok? There is boron, lithium, carbon and helium.

[00:06:40]Ok? So the atomic number of carbon remains six. So the neutrons we extracted in this were 12 - 6, there were six.

[00:06:50]How many protons were there? There were six. And how many electrons are there in it? Six remains. So which one is this? Carbon.

[00:06:57]How many live near carbon? Six remain.

[00:06:59]How many live near carbon? Six remain.

[00:07:01]So how did the 30th turn out? Six.

[00:07:04]Next, what will an atom that has lost an electron become? What will an atom that has lost an electron be like? It will become negatively charged, positively charged, electrically neutral, or still retain a positive charge. So how is it? The electron that releases. Like m released an electron, what did it become? So what does m+ become after losing electron?

[00:07:33]What will happen after losing an electron?

[00:07:35]m+ means it will become positively charged. So how is the correct answer? B. Yes son, you are giving the correct answer. Keep answering.

[00:07:50]Look, the next question is coming in front of you.

[00:07:57]What is the number of unpaired electrons in an inert gas? How much is inert gas?

[00:08:02]What is the number of unpaired electrons in an inert gas? Will the number of paired electrons in an inert gas be zero, eight, four or 18? Tell me what will be the correct answer?

[00:08:21]What is the number of unpaired electrons in an inert gas? Does it remain zero or eight or four or 18?

[00:08:31]How does zero feel? Unpaired electrons is asking for the number of unpaired electrons.

[00:08:36]Unpaired electrons How many electrons are in the valence shell? He is not asking this.

[00:08:41]How many are there in the greatest cell? He is not asking this.

[00:08:46]How many unpaired electrons are there?

[00:08:48]How many unpaired electrons are in inert gases? He is asking that question. The question being asked is what is the number of unpaired electrons in an inert gas? The number of unpaired electrons in inert gas is zero, eight, four, or 18. So remember, inert gases do not have any unpaired electrons.

[00:09:10]Ok? Remember what?

[00:09:15]Inert gases do not have unpaired electrons.

[00:09:35]Ok? Inert gases do not have unpaired electrons. That means it became zero. How was it? It became zero.

[00:09:45]Next. The atomic number of an element is 17.

[00:09:52]What is the number of electron-containing orbitals in its valence shell? Then atomic number of an element is 17 the number of orbital containing electron pair in valence shell valence shell electron pair in a valence shell it was asked 8 6 3 2 what was asked 8 6 3 2 which one will be correct look at the question again. The question is asking if the atomic number of an element is 17, then how many orbits of electron pairs will be there in its valence shell?

[00:10:41]Tell me quickly. There will be eight, there will be six, there will be three. We will make the atomic number of chlorine 17.

[00:11:21]How many are 1s2, 2s2 2p6, 3s2 and us 3s2 and 3p5? Tell me. What will be the number of orbitals with fewer electron pairs in the valence shell of an element?

[00:11:31]What will be the number of paired electrons?

[00:11:43]Which is the last one? Last Valence Shell. This is 3s2.

[00:11:48]Ok? So it is saying tell me the number of orbitals containing electron pairs. Orbital containing electron pair in s orbital.

[00:11:57]So which one will it be? will be 3s2. Which one will it be?

[00:12:01]3s. Orbital means how did it happen? s So which one is in it? In 3s. That means how many remained?

[00:12:07]How many more pairs of electrons are there? We have only one pair of electrons, so tell us the number of orbitals having electron pair. What orbital number is it? What is the number? He is asking this. Which number will it be? The question being asked is how many will have paired electrons?

[00:12:25]Look, we did it again 1s2 2s2 2p6 3s2 3p6. Ok? So what will be the answer? It is three. That means it will remain in this one. Ok? The next question before you is that it is given that there is a compound whose atomic weight is 89 y and the number of protons, neutrons and electrons in it is 331, then what will be the number of protons? The number of protons will turn out to be 89 only.

[00:12:58]What will be the number of electrons? The number of electrons will also come out to be 89.

[00:13:04]What will be the number of neutrons, son?

[00:13:08]231 - 89 Okay? 231 will become - 89. So this is 11 minus two. Here four left from 12. This one is 142, how much does it become? We have 89 protons. The number of neutrons became 142. So we have 89 protons, 142 neutrons and 89 electrons, okay how many are there, 89, so 89 142 and 89, so the correct answer to this is C, son, how is the correct answer to this, C, good evening son, the new batch has started in TGT. You can join. The batch in TGT has started. You can join the new batch. Is it okay to do whatever you want online or offline?

[00:14:13]And one at a reasonable price. You can know him, you can join him.

[00:14:21]Next question is. The number of electrons, neutrons and protons in a species is equal to 10.8.

[00:14:29]What is the proper symbol for a species? Ok? The number of electrons, neutrons, and protons. See, atomic number is equal to the number of protons. There are eight protons. How many protons have been given to us? We have eight protons.

[00:14:50]So the atomic number is also eight. In the nucleus and how much is given in it? Eight is the atomic number. So this is the atom, atomic number is eight, so the element which is given x, the element which is given atomic number is eight, then what will be the atomic weight, 16, that is, it will be oxygen, how will be oxygen, then what will be the number of neutrons, 16 -8, that is, it will remain eight, okay, what is the number of electrons, the number of electrons is 10, then what will be the number of electrons?

[00:15:34]Atomic number plus charge. Atomic number plus negative charge. Atomic number plus negative charge.

[00:15:49]Negative charge.

[00:15:54]So what is our atomic number? It's eight. Negative charge two means 10 so the symbol will be 8o 16 and 2 minus 8o16 and two minus. So this is the correct answer. Ok? D. How will it be? What will be the correct answer for 18?

[00:16:21]D. The correct answer for 18 will be D.

[00:16:24]Ok? Anybody else asking any questions?

[00:16:31]We are fine. Giving the correct answer.

[00:16:35]See next question.

[00:16:38]BE2 has even electrons. So of BE2+.

[00:16:43]So the atomic number of BE is four. Ok? 2 is talking about plus charge.

[00:16:50]So what will be the number of electrons? How will it be? Four and minus positive charge minus positive charge. So how much will it be? How come 4 - 2 = 2? Two. So who has two electrons? Here it will be 28 i.e. 10 electrons.

[00:17:16]Here 28 means 10 electrons.

[00:17:24]What will happen to Li2+ here? It will become two only because what is the atomic number? 3 - 1 2 means it will become two. It has two electrons. So that means Li is +1.

[00:17:38]How will it be with him too? Atomic number -1 so how many are left? Two electrons. So what will lithium be like? Lithium will become even electronic. How will BE2 be with BE2? With Be2 the sum will become electronic.

[00:17:55]How many electrons did we remove in BE2? Look at BE2, we removed two electrons. Here we saw that the charge on Li was one, so the atomic number was 3 - 1, that is, two electrons. I mean, how will this even turn out? This too will become electronic.

[00:18:13]How about the next one?

[00:18:15]State the number of electrons in CONH2. This is the amide group. Do we know how it is? Amide.

[00:18:24]Amide sum, in this we have to remove electron.

[00:18:30]Look at C double B O NH2 so what is the number of electrons in O? O has eight electrons right? Carbon has six electrons, nitrogen has seven, it has two electrons.

[00:18:52]Ok? So how many are there? 7 6 13 ok?

[00:18:58]How many have we done? See that carbon has six electrons.

[00:19:05]Oxygen has eight electrons.

[00:19:10]Nitrogen has seven electrons and hydrogen has two electrons, so how much is it 8 2 10, okay, see how much do we have, 8 6 14 and 14 and seven, how much will it be, add them, 7 2 9 9 8 17 6 ​​23, okay, there were 23, out of which one is minus its carbon and five were left.

[00:19:44]How is this one? Free. So how many kisses are there in this? How many does he have left? Have become?

[00:19:52]Five left. So if we add this then what will be the total? If we add the total, how much will it be? 22 electrons. Ok?

[00:20:01]Five electrons have been removed, so five electrons of carbon, eight electrons of oxygen, seven electrons of nitrogen and these two electrons of hydrogen, so 7 2 9 9 and 17 5 22, so how many electrons are there, 22 electrons. Next, see which of the following particles has more electrons than neutrons? Which one will have more?

[00:20:30]So the one with negative charge always has more. There are more near negative charges.

[00:20:36]So the atomic number of O is eight. The atomic weight is 16. So what will be the number of protons? It will become eight. The number of neutrons will become 16 - 8. That means it will become eight.

[00:20:50]And the number of electrons is eight plus the negative charge.

[00:20:57]How much will the negative charge be, son?

[00:21:02]8 + 2 means 10 electrons. How many will there be? 10 electrons. So what would be the correct answer?

[00:21:11]C. The correct answer for 21 will be C.

[00:21:15]Ok? Next.

[00:21:18]Which of the following is isoelectronic with carbon atom? with the carbon atom.

[00:21:24]So there are six carbon atoms left. The number of electrons is six.

[00:21:30]Sodium will come close to 10.

[00:21:34]10 electrons will come with it.

[00:21:37]Ok? There will be 10 here. Here it will become 7 - 1 i.e. six. So this will be the correct answer. This will be the correct answer to this, D of 22.

[00:21:54]How about the next one? Titium means Titium means T. Ok? How many are there in Titium? We will understand. Atomic number one, atomic weight three. So the number of electrons will be one, the number of protons will be one, the number of neutrons will be 3 - 1 i.e. two. Ok? So how was it? One proton, one neutron, not one proton, three neutrons, this is also not one proton, 0 neutrons, this is also not one proton, two neutrons, that is correct, one proton and two neutrons, this is correct. Next we come. Which of the following is not isoelectronic? Ok? Which is not even electronic? See, it will come to atomic number 11 -1 i.e. 10 electrons.

[00:22:47]How will it be here? 12 – 2 = 10 electrons.

[00:22:52]How will 8 + 2 be equal here? 10 electrons. And what about atomic number 24 here? 24 electrons. So this is even electronic. Not this. This is not even electronic.

[00:23:11]How is the next isoelectronic species? 10 electrons here 10 electrons here 10 electrons here eight here 10 here seven here 10 here six so which is the even electron species?

[00:23:34]How will it be? How does 25 of A 25 of A hold? Hey, son, today we practiced some questions. Now I will definitely come to you in a video to discuss a notification of GIC.

[00:23:48]So that's all for today, we will meet you in the next class with more questions, with better questions from TGT PGT and how will be the pattern of GIC Mains questions, especially related to Chemistry, we will discuss it with you. So we will meet in the next class, till then Jai Siyaram.