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    • Posted by Timish Mehra 1 year, 10 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sadiya Shaikh 1 year, 8 months ago

    It is applicable weak electrolytes

    0Thank You

    Gyan Kumar 1 year, 10 months ago

    Kohlrausch law is used for degrees of dissociation of weak electrolyte, Kohlrausch law is used for solubility.

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    ANSWER

    • Posted by Ashutosh Singh 1 year, 10 months ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Sonal Maurya 1 year, 7 months ago

    CH3CH=CH2 +Hbr/H2O2 = CH3CH2CH2Br + NaOH/H* = CH3CH2CH2OH

    0Thank You

    Keshav Chauhan 1 year, 8 months ago

    CH3 - CH = CH2 + BH3 = CH3-CH2-CH2OH

    0Thank You

    Rudra Dwivedi 1 year, 10 months ago

    CH3-CH=CH2 + H2O. →

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    • Posted by Princy Princy 1 year, 10 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Rudra Dwivedi 1 year, 10 months ago

    Bio Diesel is best topics

    0Thank You

    Nikhil Kumar 1 year, 10 months ago

    Which class

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    General Instructions: Read the following instructions carefully. There are 33 questions in this question paper with internal choice. SECTION A consists of 16 multiple-choice questions carrying 1 mark each. SECTION B consists of 5 short answer questions carrying 2 marks each. SECTION C consists of 7 short answer questions carrying 3 marks each. SECTION D consists of 2 case - based questions carrying 4 marks each. SECTION E consists of 3 long answer questions carrying 5 marks each. All questions are compulsory. Use of log tables and calculators is not allowed. SECTION A The following questions are multiple-choice questions with one correct answer. Each question carries 1 mark. There is no internal choice in this section. 1.Which of the following solutions will have the highest conductivity at 298 K? 0.01 M HCl solution 0.1 M HCl solution 0.01 M CH3COOH solution 0.1 M CH3COOH solution 2.The vitamins which can be stored in our body are: Vitamin A, B, D and E Vitamin A, C, D and K Vitamin A, B, C and D Vitamin A, D, E and K 3.What is IUPAC name of the ketone A, which undergoes iodo form reaction to give CH3CH=C(CH3)COONa and yellow precipitate of CHI3? 3-Methylpent-3-en-2-one 3-Methylbut-2-en-one 2, 3-Dimethylethanone 3-Methylpent-4-one 4.Which of the following is not correct? In haloarenes, the electron pairs on halogen atom are in conjugation with -electrons of the ring The carbon-magnesium bond is covalent and non-polar in nature. During SN1 reaction, the carbocation formed in the slow step being sp2 hybridised is planar Out of CH2= CH-Cl and C6H5CH2Cl, C6H5CH2Cl is more reactive towards SN1 reaction 5.Which of the following is not correct? In haloarenes, the electron pairs on halogen atom are in conjugation with -electrons of the ring The carbon-magnesium bond is covalent and non-polar in nature. During SN1 reaction, the carbocation formed in the slow step being sp2 hybridised is planar Out of CH2= CH-Cl and C6H5CH2Cl, C6H5CH2Cl is more reactive towards SN1 reaction 6.Match the properties with the elements of 3d series: Lowest enthalpy of atomisation Sc shows maximum number of oxidation states Mn transition metal that does not form coloured compounds Zn Ti (i) (r), (ii) (q), (iii) (p) (i) (r), (ii) (s), (iii) (p) (i) (p), (ii) (q), (iii) (r) (i) (s), (ii) (r), (iii) (p) 7.In which of the following solvents, the C4H8NH3+X– is soluble; ether acetone water bromine water 8.Which of the following observation is shown by 2-phenyl ethanol with Lucas Reagent? Turbidity will be observed within five minutes No turbidity will be observed Turbidity will be observed immediately Turbidity will be observed at room temperature but will disappear after five minutes. 9.Anisole undergoes bromination with bromine in ethanoic acid even in the absence of iron (III) bromide catalyst Due to the activation of benzene ring by the methoxy group. Due to the de-activation of benzene ring by the methoxy group. Due to the increase in electron density at ortho and para positions Due to the formation of stable carbocation. 10.Which of the following is not considered a transition element? Scandium Silver Vanadium Zinc 11.Zirconium (Zr, Atomic number 40) and Hafnium (Hf, Atomic number 72) are transition series metals of group 4. They are found together in nature and are difficult to separate from each other. Which of the following is the reason for the above? The almost identical radii of the atoms. The elements belong to the same group. The elements belong to adjacent periods. The presence of the same number of unpaired electrons in both the elements. 12.Which of the following would be among the products of the reactions between ammonia reacts with bromoethane? CH3CH2NH2 (CH3CH2)2NH (CH3CH2)3N (CH3CH2)4N+Br− only i only i and ii only i, ii, and iii all- i, ii, iii and iv 13.Which one of the following is a synthetic halogen compound? a) Chloramphenicol b) Diphenyl hydramine c) Chloroquine d) Omeprazole 14.Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium? a) [Xe] 4f 65d26s2 b) [Xe] 4f75d1 6s2 c) [Xe] 4f86d2 d) [Xe] 4f95s1 15.Alcoholic compounds react: a) only as nucleophiles. b) both as nucleophiles and electrophiles. c) only as electrophiles. d) None of these 16.p – toluenesulphonyl chloride is used to: a) as a replacement of benzenesulphonyl chloride b) All of these c) for the distinction of primary, secondary and tertiary amines d) for the separation of a mixture of amines SECTION B 17.5% solution of Na2SO4.10H2O (MW = 3 22) is isotonic with 2% solution of non- electrolytic, non volatile substance X. Find out the molecular weight of X. 18.Arrange the isomeric dichlorobenzene in the increasing order of their boiling point and melting points. Explain why the electrophilic substitution reactions in haloarenes occur slowly and require more drastic conditions as compared to those in benzene. 19.Convert the following: Benzene to m-nitrobenzaldehyde Bromobenzene to benzoic acid 20.Explain the following observations: The transition elements have great tendency for complex formation. There is a gradual decrease in the atomic sizes of transition elements in a series with increasing atomic numbers. 21 define .carbonyl group. SECTION c 22.Nitration is an example of aromatic electrophilic substitution and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol, which one is more easily nitrated and why? Or How do you convert the following? Benzoic acid to benzaldehyde. Ethyne to ethanal. Acetic acid to methane 23.A mixture of 0.5 moles acetaldehyde and 0.5 moles diethyl ketone is treated with 1 mole of sodium cyanide (NaCN). What will be the major product in this reaction? Give two reasons for your answer Or Show steps to convert nitrobenzene to phenol. The table below shows the observation when sodium reacts with ethanol and phenol. Ethanol Solution of phenol in ethanol Sodium sinks, evolves hydrogen steadily Sodium sinks, evolves hydrogen rapidly The reaction in each case involves reduction of hydrogen ion by sodium. Write down an ionic reaction for both the cases. Which is stronger acid- phenol or ethanol? Why? 24.Explain the steps of preparation of potassium dichromate? Or Transition metals generally form coloured ions. Why? Which of the following will be colored? 25.What is the lanthanoid contraction? What are its causes and consequences? 26. A solution is obtained by mixing 300 g of 25% solution and 400 g of 40% solution by mass. Calculate the mass percentage of the resulting solution. 27.. A compound ‘A’ with molecular formula C4H10O on oxidation forms compound ‘B’ gives positive iodoform test and on reaction with CH3MgBr followed by hydrolysis gives (c). Identify A, B & C. Or Give the equations of reactions for the preparation of phenol from cumene. 28.Chloroform is stored in dark coloured bottles. Section D 29.Read the text carefully and answer the questions: The d-block of the periodic table contains the elements of the groups 3 to 12 and are known as transition elements. In general, the electronic configuration of these elements is (n - 1)d1-10 ns1-2. The d-orbitals of the penultimate energy level in their atoms receive electrons giving rise to the three rows of the transition metals i.e. 3d, 4d and 5d series. However, Zn, Cd and Hg are not regarded as transition elements. Transition elements exhibit certain characteristic properties like variable oxidation stables, complex formation, formation of coloured ions, alloys, catalytic activity etc. Transition metals are hard (except Zn, Cd and Hg) and have a high melting point. Why are Zn, Cd and Hg non-transition elements? OR Why are melting points of transition metals high? Which transition metal of 3d series does not show variable oxidation state? Why do transition metals and their compounds show catalytic activity 30.An organic compound ‘A’ having molecular formula C5H10O gives negative Tollens’ test, forms n-pentane on Clemmensen reduction but doesn’t give iodoform test. Identify ‘A’ and give all the reactions involved. Carry out the following conversions: Propanoic acid to 2-Bromopropanoic acid Benzoyl chloride to benzaldehyde How will you distinguish between benzaldehyde and acetaldehyde Section E 31.Write the outer shell electronic configuration of an element with atomic number 24. Why is this different from the elements that are adjacent to it in the periodic table? Why is Hg not considered as a transition element? The third ionisation enthalpy of a few transition elements are given below: Element Sc Ti V Cr Mn Fe Co Ionisation enthalpy (kJ mol-1) 2393 2657 2833 2990 3260 2962 3243Explain the reason for the break in the trend of steady increase in third ionisation enthalpy as shown in the table. Based on this, what can be said about the second ionisation energy of Cr as compared to that of Mn? Or Write the structures of the following organic halogen compounds. (i) 2-Chloro-3-methylpentane (ii) p-Bromochlorobenzene (iii) 1-Chloro-4-ethylcyclohexane (iv) 2-(2-Chlorophenyl)-1-iodooctane (v) Perfluorobenzene (vi) 4-tert-Butyl-3-iodoheptane (vii) 1-Bromo-4-sec-butyl-2-methylbenzene (viii) 1,4-Dibromobut-2-ene 32.The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase. Or write the structures of the following compounds. (i) α-Methoxypropionaldehyde (ii) 3-Hydroxybutanal (iii) 2-Hydroxycyclopentanecarbaldehyde (iv) 4-Oxopentanal (v) Di-sec-butyl ketone (vi) 4-Fluoroacetophenone 33.Write structures of the compounds whose IUPAC names are as follows: (i) 2-Methylbutan-2-ol (ii) 1-Phenylpropan-2-ol (iii) 3,5-Dimethylhexane -1, 3, 5-triol (iv) 2,3 - Diethylphenol (v) 1 - Ethoxypropane (vi) 2-Ethoxy-3-methylpentane (vii) Cyclohexylmethanol (viii) 3-Cyclohexylpentan-3-ol (ix) Cyclopent-3-en-1-ol (x) 3-Chloromethylpentan-1-ol.

    • Posted by Sagar Pandey 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Ashutosh Singh 1 year, 10 months ago

    Waah beta ! Poora question paper hi chhap diya

    0Thank You

    Ankit Singh 1 year, 10 months ago

    Kya hai ye pura paper hi likh diye ho

    2Thank You

    ANSWER

    • Posted by Govind Lahare 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Amrit Kumar 1 year, 10 months ago

    2>1>3

    1Thank You

    ANSWER

    • Posted by Antra Suthar 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Anand Verma 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Keshav Chauhan 1 year, 8 months ago

    diamminebis(ethane 1,2- diamine)iron (lll) ion

    0Thank You

    Komal Gola 1 year, 9 months ago

    Diamminebis (ethane 1,2 diamine) ferrous(III)

    2Thank You

    ANSWER

    • Posted by Keshav Khanduri 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Aditi Bramh 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Charan Teja 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Keshav Chauhan 1 year, 8 months ago

    When we move from 3d to 4d and 4d to 5d... The electrons start to be filled in the f subshell. As the screening power of the electrons of the f subshell is very poor, that's why there is regular decrease in the atomic radii of these elements, this is called lanthanoid contraction

    0Thank You

    ANSWER

    • Posted by Krushnakant Nayak 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Keshav Chauhan 1 year, 8 months ago

    Dry cell is a primary cell. It works as voltaic cell. It is used in clocks, remotes,etc.

    0Thank You

    Aa Zz 1 year, 11 months ago

    Which do not have liquid

    1Thank You

    ANSWER

    • Posted by Ankita Thakur 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Varsha Penumudi 1 year, 11 months ago

    Double bond is preffered

    2Thank You

    Kriti Kumari 1 year, 11 months ago

    Start Numbering from where the functional group come first

    9Thank You

    ANSWER

    • Posted by Aayushi Sagar 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Siddharth Jaiswal 1 year, 11 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    • Posted by Hari K.C 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Hema Sharma 1 year, 8 months ago

    C6H5SO2Cl

    0Thank You

    Hema Sharma 1 year, 8 months ago

    Use for distinguish between primary, secondary and tertiery amine Formula- C6h5 SO2c

    0Thank You

    ANSWER

    • Posted by Payal Chouhan 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Siddharth Jaiswal 1 year, 11 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    Meraj Ahmed 1 year, 11 months ago

    15 g glucose is present in 60g aqueous solution the molality of solutes

    2Thank You

    Krishna Achu 1 year, 11 months ago

    This is because silver usually exhibits it's oxidation state more (Ag+, Ag2+...) because of its stability, so that's why it is a transition element.

    4Thank You

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    • Posted by Yami Yami 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Payal Chouhan 1 year, 11 months ago

    Silver metal has completely filled d orbitals in its ground state. How can you say that it is a transition elements

    1Thank You

    ANSWER

    • Posted by Sachi Pandey 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Suraj Patel 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Lovish Raj 1 year, 11 months ago

    Because in alcohol +I effect makes alcohol unstable whereas phenol is resonance stabilised.

    1Thank You

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    • Posted by Dibyangi S 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Nandini Upadhyay 1 year, 11 months ago

    By grignards reagent

    0Thank You

    Siddharth Jaiswal 1 year, 11 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    • Posted by Sanjyoti Patel 1 year, 11 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Soni Kushwaha 1 year, 11 months ago

    It will be.. 3-methyl but-2-ene-1-oic acid

    3Thank You

    ANSWER

    • Posted by Afsana Begam 2 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Siddharth Jaiswal 1 year, 11 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    0Thank You

    Farhana Faisal 1 year, 11 months ago

    Cz its a non volatile solute

    0Thank You

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    • Posted by Dev Kumar 2 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sanjyoti Patel 1 year, 11 months ago

    Fir physical chemistry - make formula sheet and imp.graph . Fir organic -make separate notebook for name rexns.

    1Thank You

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    • Posted by Mayank Pal 2 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Afsana Begam 2 years ago

    1. In the production of carbonated beverages 2. In the deep sea diving 3. For climbers or people living at high altitudes 4. In the function of lungs

    0Thank You

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    • Posted by Nandini Jindal 2 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sakshi Omar 2 years ago

    A

    1Thank You

    Adarsh Pandey 2 years ago

    A

    3Thank You

    ANSWER

    • Posted by Lakshmi Kumari 2 years ago

    CBSE > Class 12 > Chemistry
    • 5 answers

    Khushi Jaiswal 2 years ago

    yes my dear, promblem is a small part of our life.. but still many peoples are facing the problem.. bcs they don't loose their hopes.. I think that you also don't loose your hops.. and start now.. and i know you will do its.. ❤

    1Thank You

    Aseem Mahajan 2 years ago

    <font face ="Times New Roman">mne face kiya h, mujhe nhi pta aapke wha problem kitni serious h but hope it will be ok.
    But jb studies ki baat aati h, don't worry and be consistent abhi bhi time h ye mid term sb kuch nhi h main boards h tb tk to ho hi jayega lekin krna padega , not that difficult i guarentee

    5Thank You

    Aditya Gupta 2 years ago

    Yaar mere saath bhi ye problem hai

    0Thank You

    Account Deleted 2 years ago

    Corrections:- Problems are part of life and I understand sometimes it's hard to focus on studies because of that but don't waste your more time thinking about the time that you wasted , you still have plenty of time . You can prepare well , if you will manage to study 4-5 hours or atleast 3 hours a day from now daily , you can definitely score well just don't lose your hope , have faith in yourself and keep smiling:-)... Mycbseguide please provide the provide the option to edit ..

    4Thank You

    Account Deleted 2 years ago

    Problems are part of life and I understand sometimes it's hard to focus on studies because of that but don't waste your thinking about the time that you wasted , you still have plenty of time . You can prepare well , if you will manage to study 4-5 hours or atleast 3 hours a day from now daily , you will definitely can score good just don't lose your hope and have faith in yourself and keep smiling:-)

    2Thank You

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    • Posted by Lakshmi Kumari 2 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sarita Mishra 2 years ago

    During the electrolysis of aqueous copper sulphate using copper electrodes, copper ions are generated at the anode, that go into the copper sulphate solution used as electrolyte. Next, the copper ions from the electrolyte are deposited at the cathode.

    0Thank You

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    • Posted by Lakshmi Kumari 2 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Vijay Khanorkar 2 years ago

    Alkene

    0Thank You

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    • Posted by Sania Hangma Subba 2 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Priyansh Pratap Singh 2 years ago

    In weak electroyt moler conductivity is less then that of strong electrolyt.

    1Thank You

    ANSWER

    • Posted by Mariyam Nagori 2 years ago

    CBSE > Class 12 > Chemistry
    • 5 answers

    Mahak Choudrii 2 years ago

    Mangenese

    0Thank You

    Mahak Choudrii 2 years ago

    Chromium

    3Thank You

    Sehar Rizvi 2 years ago

    Its

    1Thank You

    Rishab Kumar Kumar 2 years ago

    Shows 2 to 7 it's a d block element 3d series

    0Thank You

    Rishab Kumar Kumar 2 years ago

    Mn

    0Thank You

    ANSWER

    • Posted by Gaurav Jangra 2 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Priya . 2 years ago

    The Gabriel synthesis is a chemical reaction that transforms primary alkyl halides into primary amines. Traditionally, the reaction uses potassium phthalimide. The name of the reaction comes from the German chemist Siegmund Gabriel.

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