Saved Bookmarks
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 28401. |
Give the syntax and example of UPDATE command in SQL. |
|
Answer» UPDATE command: It can be used to change row values from a table. The SET key word takes the column in which values needs to be changed or updated. The WHERE keyword is used to filter the records on some condition. |
|
| 28402. |
Explain data encapsulation. |
|
Answer» The data encapsulation is a technique that combines data and functions into a single unit called class. Here, data can be accessed through member function only present inside the class. Data encapsulation enables data hiding or information hiding. |
|
| 28403. |
भारत माता कविता का उद्देश को व्याख्या करे. |
|
Answer» ‘भारत माता’ अध्याय हिंदुस्तान की कहानी का पाँचवाँ अध्याय है। इसमें नेहरू ने बताया है कि किस तरह देश के कोने-कोने में आयोजित जलसों में जाकर वे आम लोगों को बताते थे कि अनेक हिस्सों में बँटा होने के बाद भी हिंदुस्तान एक है। इस अपार फैलाव के बीच एकता के क्या आधार हैं और क्यों भारत एक देश है, जिसके सभी हिस्सों की नियति एक ही तरीके से बनती-बिगड़ती है। उन्होंने भारत माता शब्द पर भी विचार किया तथा यह निष्कर्ष निकाला कि भारत माता की जय का मतलब है-यहाँ के करोड़ों-करोड़ लोगों की जय। नेहरू जी का कहना है कि जब वे जलसों में जाते हैं तो वे श्रोताओं से भारत की चर्चा करते हैं। भारत संस्कृत शब्द है और इस जाति के परंपरागत संस्थापक के नाम से निकला है। शहरों में लोग अधिक समझदार हैं। गाँवों में किसानों से देश के बारे में चर्चा करते हैं। वे उन्हें बताते हैं कि देश के हिस्से अलग होते हुए भी एक हैं। वे उन्हें बताते थे कि उत्तर सँ लेकर दक्षिण तक और पूरब से लेकर पश्चिम तक उनकी समस्याएँ एक जैसी है और स्वराज्य सभी के लिए फायदेमंद है। नेहरू ने सारे भारत की यात्रा की। इस दौरान उन्होंने यह समझाने का प्रयास किया कि हर जगह किसानों की समस्याएँ एक-सी हैं-गरीबों, कर्जदारों, पूँजीपतियों के शिकंजे, जमींदार, महाजन, कड़े लगान और सूद, पुलिस के जुल्म। ये सभी बातें विदेशी सरकार की देन हैं तथा सबको इससे छुटकारा पाने के लिए सोचना है। सभी लोगों को देश के बारे में सोचना है। वे . लोगों से चीन, स्पेन, अबीसिनिया, मध्य यूरोप, मिस्र और पश्चिमी एशिया में होने वाले परिवर्तनों का जिक्र करते हैं। वे सोवियत यूनियन व अमरीका की उन्नति के बारे में बताते हैं। किसानों को विदेशों के बारे में समझाना आसान न था किंतु उन्होंने जैसा समझ रखा था वैसा मुश्किल भी न था। इसका कारण यह था कि हमारे महाकाव्यों व पुराणों ने इस देश की कल्पना करा दी थी और तीर्थ यात्रा करने वाले लोगों ने या बड़ी लड़ाइयों में भाग लेने सिपाहियों और कुछ ने विदेशों में नौकरी करके देश-दुनिया की जानकारी दी। सन् तीस की आर्थिक मंदी की वजह से दूसरे देशों के बारे में नेहरू जी के दिए गए उदाहरण लोगों के समझ में आ जाते थे। जलसों में नेहरू का स्वागत अकसर ‘भारत माता की जय’ के नारे से होता था। वे लोगों से इस नारे का मतलब पूछते तो वे जवाब न दे पाते। एक हट्टे-कट्टे किसान ने भारत माता का अर्थ धरती बताया। उन्होंने पूछा कि कौन-सी धरती? उनके गाँव, जिले, सूबे या पूरे देश की धरती। इस प्रश्न पर फिर सब चुप हो जाते। नेहरू उन्हें बताते हैं कि भारत वह है जो उन्होंने समझ रखा है। इसमें नदी, पहाड़, जंगल, खेत व करोड़ों भारतीय शामिल हैं। भारत माता की जय का अर्थ है–इन सबकी जय। जब वे स्वयं को भारत माता का अंश समझते थे तो उनकी आँखों में चमक आ जाती थी। |
|
| 28404. |
Frame a dialogue with a minimum of ten exchanges for the given situation: You have joined a new school. You meet a student. Introduce yourself and make friends with that student, requesting him/her to accompany you to school and back. |
|
Answer» Myself : Hai, I am Swetha, a new student in your school. Student : Oh, I see. In which class? Myself : XIA section. May I know your sweet name? Student : I am Radhika. I am a standard-X student. But my sister Anitha is there in your class. I drop in to see her sometimes. When I don’t have special classes, we go home together. Myself : When do you leave for school daily? Student : 8.20 am. Myself : Will you please allow me to join you? Student : Certainly, I will. Myself : Thank you, Radhika. It’s so kind of you. Student : You are most welcome. |
|
| 28405. |
Frame a dialogue with a minimum of ten exchanges for the given situation: Between two cricket players after their team lost a match very narrowly |
|
Answer» Arjun : You should have hit the last ball for six, Han : I did try but it got deflected. Arjun : The first fifteen overs were very rewarding. We had even thought we’d win. Han : Truc, but after the fall of Shikar’s wicket, things changed. Arjun : Yes. I saw how wickets started falling in quick succession. Han : The new bowler from Australia is doing wonders with the ball. Arjun : Yes, even ¡ found some of the balls very tricky. Han : He changes the length and combines spin bowling with medium pace bowling. Han : His bowling only turned the game on Australia’s favour. Arjun : 0k! We will beat them in the next match. Han : Yes, we must. |
|
| 28406. |
Frame a dialogue with a minimum of ten exchanges for the given situation: Between a man and his wife discussing the arrangements to be made to celebrate their child’s third birthday. |
|
Answer» Naina : Maya’s third birthday falls on 15th December. Poomi : I do know. Naina : We must celebrate it differently this year. Poomi : How? Naina : We must prepare food for 20 persons. Poomi : No, we will order it from a mess. Naina : No, we will assist our cook to prepare the food. Poomi : Are we going to invite 20 persons here? Naina : No, we will take the food to the nearest orphanage. Poorni : We can let Maya see us serving the food. Naina : She will also leam to be kind to fellow humans. Poomi : Yes. It is a good idea. |
|
| 28407. |
निमनलिखित शब्दों के वचन बदलकर लिखिए:इच्छाएँ - |
|
Answer» इच्छा - इच्छाएँ |
|
| 28408. |
Write a Diary entry each day for a month and compile them into a book. You may also name your diary as Anne Frank did. |
|
Answer» 1st February, 2018 Dear Kibu, Being the first day of the month, I went to the temple before going to school. I asked God to be with me, guide and lead me this month. I cannot forget the morning assembly. It was about Mother Theresa. The theme was Help the Needy. Time is fleeting. I must focus in my studies and get good marks. I must aim to be a doctor and help the needy. 2nd February, 2018 Dear Kibu, Today I had the opportunity to go by the metro with my mom. The station was spic and span. There weren’t many commuters. Most of them were decent and disciplined. I could not find anyone littering the area. There was orderliness while buying the tickets. The announcements were meticulous. The doors opened and shut automatically. We realized that the mobile phones weren’t working inside the station. What amazed me was the time taken to travel even long distances! I doubt anyone would commute to far off places by buses when metros take us at short time. 3rd February, 2018 Dear Kibu, My exam, starts tomorrow and I’m slightly scared. Tomorrow is my first exam. French isn’t tough for me. However, I’m so anxious these dayscause I want to get the first mark. Until my Math exam is over, I won’t be able to breathe properly. I have always had a very sound sleep and now I’m sleepless! I am sure I can overcome the stress and do pretty well with systematic studies, meticulous revision and God’s help. |
|
| 28409. |
पक्षी उन्मुक्त रहकर अपनी कौन-कौन सी इच्छाएं पूरी करना चाहते है़ंं ? |
|
Answer» पक्षी उन्मुक्त होकर वनों की कड़वी निबोरियाँ खाना, खुले और विस्तृत आकाश में उड़ना, नदियों का शीतल जल पीना, पेड़ की सबसे ऊँची टहनी पर झूलना और क्षितिज से मिलन करने की इच्छाओं को पूरी करना चाहते हैं। |
|
| 28410. |
“Why don’t you use crayons for colouring?” said Dhilip to his son. |
|
Answer» Dhilip suggested his son to use crayons for colouring |
|
| 28411. |
Pragathi said to her sister, “I need your help to arrange the books in the shelf.” |
|
Answer» Pragathi asked her sister’s help to arrange the books in the shelf |
|
| 28412. |
Can I get PPT on lakhnau ke janjivan par in hindi like there special food for what they are famous there culture there songs there film about 10 pages |
Answer» NAHI MALOOM BHAI |
|
| 28413. |
वाक्य शुद्ध कीजिए:निन्दा का ऐसी ही महिमा है। |
|
Answer» निन्दा की ऐसी ही महिमा है। |
|
| 28414. |
शमसुद्दीन अखबारों के वितरण का कार्य कैसे करते थे? |
|
Answer» शमसुद्दीन रामेश्वरम् में अखबारों के एकमात्र वितरक थे। अखबार रामेश्वरम् स्टेशन पर सुबह की ट्रेन से पहुँचते थे। इस अखबार एजेंसी को अकेले शमसुद्दीन ही चलाते थे। रामेश्वरम् में अखबारों की जुमला एक हजार प्रतियाँ बिकती थी। |
|
| 28415. |
फागुन माह के प्राकृतिक सौंदर्य का वर्णन करते हुए एक लोक गीत लिखे । |
|
Answer» गीतों से भरे दिन फागुन के ये गाए जाने को जी करता! ये बाँधे नहीं बँधते, बाँहें- रह जातीं खुली की खुली, ये तोले नहीं तुलते, इस पर ये आँखें तुली की तुली, ये कोयल के बोल उड़ा करते, इन्हें थामे हिया रहता! अनगाए भी ये इतने मीठे इन्हें गाएँ तो क्या गाएँ, ये आते, ठहरते, चले जाते इन्हें पाएँ तो क्या पाएँ वन-वन में फागुन लगा, भाई रे पात पात फूल फूल डाल डाल देता दिखाई रे अंग रंग से रंग गया आकाश गान गान निखिल उदास चल चंचल पल्लव दल मन मर्मर संग हेरी ये अवनी के रंग करते नभ का तप भंग क्षण-क्षण में कम्पित है मौन आई हँसी उसकी ये आई रे
|
|
| 28416. |
मानवता ने मनुष्य को खून पसीने से क्यों सींचा है |
|
Answer» कवि कह रहे है मानवता की रक्षा करना तुम्हारा पहला कर्तव्य है, खुद की रक्षा से भी बढकर है। किसी के मिट जाने से भी मानवता बच जाए, उसकी रक्षा हो जाए। तभी सत्य की जीत होती। अपन निजी स्वार्थ के लिए हम मनुष्यता का नाश न करे, उसे नुकसान न पहुँचाए। मनुष्य-जाति के लिए, जन-जाति के भालाई के लिए भले ही तू अपने आपको मिटा दे। अच्छाई के लिए आत्मसमर्पण कर दे लेकिन दृष्टों के सामने सिर न झुका, उनकी जीत न होने पाए। |
|
| 28417. |
The time period of " Bijolia movement" is - 1. 1887 - 19402. 1897 - 19413. 1885 - 19394. 1884 - 1944 |
|
Answer» Correct Answer - Option 2 : 1897 - 1941 The correct answer is 1897 - 1941.
|
|
| 28418. |
Which of the following was the major issue in " Bijolia movement"?1. Land revenue and tax2. water supply3. Employment 4. None of these |
|
Answer» Correct Answer - Option 1 : Land revenue and tax The correct answer is Land revenue and tax.
|
|
| 28419. |
Monastery was re-established in 1672 by King Sengge Namgyal. Annual festival honours Padmasambhava. The legend of Naropa, disciple of yogi Tilopa is associated with this historic structure. Name the monastery |
|
Answer» Correct answer is Hemis |
|
| 28420. |
_______ is the first Anglican Church of the Mumbai city whose foundation was laid in 1672 and was completed in 1718. a) Little Mount Church b) Santa Cruz Basilica c) Cathedral Church of St. Thomas d) Christ Church |
|
Answer» Correct answer is c) Cathedral Church of St. Thomas |
|
| 28421. |
According to 2011 census how many cities in India have mare than 1 million population?1. 522. 533. 544. 55 |
|
Answer» Correct Answer - Option 2 : 53 The correct answer is 53.
|
|
| 28422. |
As per the 2011 census what was the rate of improvement in female literacy during 2001 to 2011? 1. 53.7% to 65.5% 2. 54.1% to 67.2% 3. 52.3% to 64.4%4. 55.3% to 63.2% |
|
Answer» Correct Answer - Option 1 : 53.7% to 65.5% The correct answer is 53.7% to 65.5%.
|
|
| 28423. |
The Shrimad Bhagvata Gita contains ______ chapters and ______Sanskrit slokas or couplets. (a) 14,500 (b) 16,600 (c) 18,700 (d) 20,800 |
|
Answer» The Shrimad Bhagavata Gita contains 18 chapters and 700 Sanskrit slokas or couplets. |
|
| 28424. |
Which of the following is the oldest seat of learning? (a) Nalanda (b) Vikramshila(c) Taxila (d) Ujjain |
|
Answer» Taxila is the oldest seat of learning. |
|
| 28425. |
In ancient India, Nalanda University represented a great centre for the study of (a) Mahayana Buddhism (b) Hinduism (c) Hinayana Buddhism (d) Jainism |
|
Answer» (a) Mahayana Buddhism |
|
| 28426. |
Who wrote the holy grantha 'Geeta'?1. Krishna2. Valmiki3. Kalidas4. Ved Vyas |
|
Answer» Correct Answer - Option 4 : Ved Vyas The correct answer is Ved Vyas.
|
|
| 28427. |
Which of the following file formats is typically used to distribute read-only documents that preserve the layout of a page across different machines?1. DOC2. EXE3. PDF4. TXT |
|
Answer» Correct Answer - Option 3 : PDF The correct answer is PDF.
|
|
| 28428. |
Which one of the following does not exist? (i). `XeOF_4` (ii). `NeF_2` (iii). `XeF_4` (iv). `XeF_6` |
| Answer» Correct option is (ii), `NeF_2` does not exist as the sum of first and second ionisation enthalpies of `Ne` are much higher than `Xe`. As a result `F_2` cannot oxidise `Ne`. On the other hand `XeF_4`,`XeF_6`,`XeOF_4` do exist. | |
| 28429. |
Arrange the following in the order of property indicated for each set: (i). `F_2,Cl_2,Br_2I_2-` increasing bond dissociation enthaply. (ii). `HF,HCl,HBr,HI`- increasing acid strength. (iii). `NH_3,PH_3,AsH_3,SbH_3,BiH_3-` increasing base strength. |
|
Answer» (i). Bond dissociation entalpy: `I_(1)ltF_(2)ltBr_(2)ltCl_(2)` Down the group `(darr)` i.e., `F_2` to `Cl_2`, bond dissociation enthalpy should decrease with the increase in bond distance or length for `F_2` to `I_2`. Howerver, the bond dissociation enthalpy of `F_2` is smaller than that of `Cl_2` and even that of `Br_2`. This is dye to the fact that F atojm is very small and hence the three lone pairs of electrons on each F repel the bond pair holding the F-atoms in `F_2` molecule. (ii). Acid sthrength: `HFltHClltHBrltHI` The relative acid strength of hydraacids depends on their bond dissociation entalpies As the size of atom increases from F to I the bond strength decreases from `H-F` to `H-I` and hence bond dissociation enthalpies decreases from `H-F` to `H-I`. Hence the acid strength increases from `H-F` to `H-I`. (iii). Base strength: `BiH_3ltSbH_3ltAsH_3ltPH_3ltNH_3` Due to presence of lone pair of electrons on the central atom in `NH_3`,`PH_3`,`AsH_3`,`SbH_3` and `BiH_3`, all behave as lewis bases. Down the group, i.e., from `NH_3` to `BiH_3`, the size of the central atom increases hence lone pair occupies a larger bolume. Consequently the electron density on the central atom decreases and Lewis base strength decreases from `NH_3` to `BiH_3`. |
|
| 28430. |
Which of the following is not a broad spectrum antibiotics ?A. PenicillinB. AmoxicillinC. ChloramphenicolD. Ampicillin |
|
Answer» Correct Answer - A Antibiotics which kill or inhibit a wide range of gram positive and gram negative bacteria are called broad spectrum antibiotics. Among the given options, penicillin is not a broad spectrum antibiotics. It is a narrow spectrum antibiotics ie., it is effective mainly against specific families of bacteria. |
|
| 28431. |
"Equivalent conducatance of 0.1 M HA (Weak acid) soution is 10" `Scm^(2)` "equivalent (-1) Hence pH of HA solution is"A. 1.3B. 1.7C. 2.3D. 3.7 |
|
Answer» Correct Answer - 3 `alpha = (wedge)/(wedge_(oo))=(10)/(200)=(1)/(20)` `[H^(+)]_("weak acid") = C "alpha"= 0.1 xx(1/20) =5xx10^(-3)` pH=3-log5 = 2.3 |
|
| 28432. |
The oxidation state of sulphur in `H_(2)S_(2)O_(7)` isA. `+4`B. `+6`C. `+5`D. `+7` |
|
Answer» Correct Answer - B Let, The oxidation state of sulphur in `H_(2)S_(2)O_(7)` be x. `:. 2 (+1) + 2 (x) + 7(-2) = 0` `2 + 2x - 14 = 0` `2x = 12x = + 6` |
|
| 28433. |
Calculate the percent error in the `[H_(3)O^(o+)]` made by neglecting the ionisation of water in `10^(-6)M NaOH` solution.A. `1%`B. `2%`C. `3%`D. `4%` |
| Answer» Correct Answer - A | |
| 28434. |
Which will have `pH` closer to 1` :`A. `100ml,M/10HCL+100ml,M/10NaOH`B. `55ml,M/10HCL+45ml,M/10NaOH`C. `10ml,M/10HCL+90ml,M/10NaOH`D. `75ml,M/5HCL+25ml,M/5NaOH` |
| Answer» Correct Answer - D | |
| 28435. |
`C_(2)H_(2)` molecules hasA. one sigma bond and `2pi` bondB. `2sigma` and `1pi`C. `3sigma` and `2pi`D. `2sigma` and `2pi` |
|
Answer» Correct Answer - 3 `H-C-=C-H` `3 sigma & 2pi` |
|
| 28436. |
If a point charge q is placed at one corner of a cube, what is the flux linked with the cube? |
|
Answer» In this case by placing three cubes at three sides of given cube and four cubes above, the charge will be in the centre. So, the fulx linked with each cube will be one-eight of the flux `q/epsilon_(0)`. `:.` Flux associated with given cube`=q/(8 epsilon_(0))` |
|
| 28437. |
Which of the following has `sp^(3) d^(3)` hybridisation ?A. `SF_(7)^(-)`B. `SF_(6)`C. `[IF_(7)]^(2+)`D. `[IF_(7)]^(2-)` |
|
Answer» Correct Answer - 1 `{:(SF_(7)^(-), to ,sp^(3)d^(3)),(SF_(6),to,sp^(3)d^(2)),([IF_(7)]^(2+),to,sp^(3)d^(2)),([O|IF_(7)]^(2-),to,sp^(3)d^(4)):}` |
|
| 28438. |
Match the items in Column I with the relevant item in Column II.Column IColumn II(i) Hydrogen peroxide is used as a(a) zeolite(ii) Used in Calgon method(b) perhydrol(iii) Permanent hardness of hard water is removed by(c) sodium hexametaphosphate(d) propellant |
| Answer» (i) → (b), (d) (ii) → (c) (iii) → (a), (c) | |
| 28439. |
Choose the correct order from the following :A. `{:(N_(2)O lt N_(2)O_(3) lt NO,,, "Acidic character"):}`B. `{:(MgO gt Al_(2)O_(3) gt SiO_(2),,, "Basic character"):}`C. `{:(Fe^(2+) lt Fe^(3+) lt Mn^(2+),,,"Ionic radius order"):}`D. `{:(Sc gt La gt Y,,, "Ionisation energy order"):}` |
|
Answer» Correct Answer - B Acidic character increases with increases of electronegativity of central atom. Ionic radius decreases with increases in positive charge on cation. |
|
| 28440. |
Refer to the periodic table given in your book and now answer the following questions: a. Select the possible non metals that can show disproportionation reaction. b. Select three metals that can show disproportionation reaction. |
|
Answer» The nonmetals are: `P_(4), Cl_(2)` and `S_(8)`. i. `P_(4)(s)+3 overset(Θ)(O)H(aq)+3H_(2)O(l) rarr PH_(3)(g)+3H_(2)PO_(2)^(Θ)(aq)` ii. `Cl_(2)(aq)+2 overset(Θ)(O)H(aq) rarr Cl^(Θ)(aq)+ClO^(Θ)(aq)+H_(2)O(l)` iii. `S_(8)(s)+12overset(Θ)(O)H rarr 4S^(2-)(aq)+2S_(2)O_(3)^(2-)(aq)+6H_(2)O(l)` b. The metal are `Cu^(o+), Ga^(o+), In^(o+)`, etc. `2Cu^(o+)(aq) rarr Cu^(2+)(aq)+Cu(s)` `3Ga^(o+)(aq) rarr Ga^(3+)(aq)+2Ga(s)` `3In^(o+)(aq) rarr In^(3+)(aq)+2In(s)` |
|
| 28441. |
Which of the following sub-shell does not exist for an atom, according to quantum theory ?A. 2dB. 4fC. 5hD. 7h |
|
Answer» Correct Answer - AC `sp^(3)d to s p_(x)p_(y) p_(z) p_(z)^(2)` `sp^(3) d^(2) to s p_(x) p_(y)p_(z)p_(z^(2))p_(x^(2)-y^(2))` `sp^(3)d^(3) to s p_(x)p_(y)p_(z)p_(z^(2))p_(x^(2)-y^(2)) d_(xy)` |
|
| 28442. |
`{:("Column-I",,"Column-II"),("(A) Electron affinity",,"(P) Depends upon effective nuclear charge."),("(B) Ionisation potential",,"(Q) Depends upon shielding constant"),("(C) Electronegativity",,"(R) Depends upon half filled and fully filled electronic configuration"),(,,"(S) Units K-Cal/mole"):}` |
|
Answer» Correct Answer - PQRS PQRS PQ Electronegativity is independent of configuration and it can be calculated by bond energy data by pauling scale. |
|
| 28443. |
An aircraft is flying at height 3600 m from the ground. If the angle subtended at the ground observation point by aircraft positions 10 s apart is 30º, what is the speed of the aircraft?(Given Answer= 60*Pi m/s) |
|
Answer» Solution: The aircraft takes 10s to go from one point (say A) to the other (say B) and AB subtends an angle of 30o at the point of observation (say O) .So, ABO forms a triangle.Now let OC be perpendicular bisector drawn from O to AB(i.e. actually the height). Then in right trianle, OAC AC = OC tan 15o = 3600 x 0.2679 = 964.44 m so, AB = 2 x 964.44 = 1928.88 m Now, the speed of aircraft , v = AB / t = 1928.88 / 10 = 192.888 m/s. |
|
| 28444. |
In a straight line motion, the distance travelled is proportional to the square root of the time taken. The acceleration of the particle is proportional to:-A. velocity B. v2 C. v3 D. v1/2 |
|
Answer» We know that distance x ∝ t½, Hence, the correct answer is (C) |
|
| 28445. |
A 150 m long train is moving with a uniform velocity of 45 km/h. The time taken by the train to cross a bridge of length 850 meters is |
|
Answer» 45kmph=12.5m/s |
|
| 28446. |
A. Blue colored solution is obtained.B. Na+ ions are formed in the solution.C. NH3(l) becomes good conductor.D. NH3(l) remains diamagnetic. |
|
Answer» Option D is correct i.e NH3(l) remains diamagnetic. |
|
| 28447. |
Metal M ions form accp structure. Oxide ions occupy ½ octahedral and ½ tetrahedral voids. What is the formula of the oxide? (a) MO (b) MO2 (c) MO3 (d) M2O3 |
|
Answer» Answer is (d) M2O3 Metal M ions form ccp structure. Let number of ions of M be : x No. of tetrahedral voids = 2x No. of octahedral voids = x Number of oxide ions will be 1/2 x + ½ (2x) = 3/2 x Formula of oxide = MxO3/2 x = M2O3 |
|
| 28448. |
Arrange the following in order of increasing molar conductivity (i) Mg [cr(NH3) (cl)5] (ii) [cr (NH3)5cl]3 [coF6]2 (iii) [cr(NH3)3cl3] |
|
Answer» [cr(NH3)3Cl3] < Mg [cr(NH3) (Cl)5] < [cr (NH3)5Cl]3 [coF6]2 |
|
| 28449. |
Ozone is a/ an __________ molecule and the two O-O bond lengths in ozone are (i)_______-and (ii) ____________ (a) linear ,110pm ; 148pm (b) angular, 110pm ; 148pm (c) linear, 128pm ; 128pm (d) angular, 128pm ; 128pm |
|
Answer» Answer is (d) angular, 128pm ; 128pm (Ozone is a resonance hybrid of two equivalent structures) |
|
| 28450. |
The reaction of toluene with Cl2 in presence of FeCl3 gives ‘X’ while theof toluene with Cl2 in presence of light gives ‘Y’. Thus ‘X’ and ‘Y’ are: (a) X = benzyl chloride Y = o and p – chlorotoluene (b) X = m – chlorotoluene Y = p – chlorotoluene (c) X = o and p–chlorotoluene Y = trichloromethylbenzene (d) X= benzyl chloride, Y = m-chlorotoluene |
|
Answer» Answer is (c) X = o and p–chlorotoluene Y = trichloromethylbenzene The reaction of toluene with Cl2 in presence of FeCl3 gives ‘X’ due to electrophilic substitution reaction taking place at ortho and para positions and reaction in the presence of light gives ‘Y’, due to substitution reaction occurring via free radical mechanism . Thus ‘X’ and ‘Y’are X = o and p–chlorotoluene Y = trichloromethylbenzene |
|