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    • Posted by Ramesh Kumar 8 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sunaina Gupta 8 years ago

    Yes they ask question like which is more acidic For eg: among phenol and phenoxide ion So u hv to draw resonating structure & do practice them it's nt 2 hard..

    2Thank You

    Vineit Kumar Gupta 8 years ago

    Yes they are sometimes needed . Specially for reasoning questions

    3Thank You

    ANSWER

    • Posted by Ramesh Kumar 8 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Nishu Rai 8 years ago

    clemensens ,canizero ,Getterman coach are imporant

    0Thank You

    Vineit Kumar Gupta 8 years ago

    I think aldol condensation and wurtz fitting reaction have high chances

    0Thank You

    ANSWER

    • Posted by Avinash Tiwari 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Nikita Khatri 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Nikita Khatri 8 years ago

    I got the answer It is ethane--1,2-- diamine

    2Thank You

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    • Posted by Candidate Candidate 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Soumya Srivastava 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Soumya Srivastava 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    The impure nickel reacts with carbon monoxide at 50–60 °C to form the gas nickel carbonyl, leaving the impurities as solids. Ni(s) + 4 CO(g) → Ni(CO)4(g) 3.

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    • Posted by Sneha Priya 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Vineit Kumar Gupta 8 years ago

    Thinking that you have some kind of issue with problems in which standard si units are not used I think these advices may help you If you cant convert all the units then at the end write the answer in that unit only with the si unit Like if your have to calculate volume but you dont know how to convert it into a specific unit lets say m^3 let it be in cm cube only . As only half or 1 mark will may be deducted for this

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    • Posted by Soumya Srivastava 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    (i) Pig iron is converted into steel by heating in a convertor . A blast of oxygen diluted with carbon dioxide is blown through the converter . Oxygen reacts with impurities and raised the temperatures to 2173k2173k . Carbon gets oxidized to CO which burns off at the mouth of the converter . Oxides of silicon and MgMg form slag, when the flame is stopped, slag is tapped off and other metals like Mn,Cr,Ni,WMn,Cr,Ni,W may be added in the end . The reduction of zinc oxide is done using coke as a reducing agent. For the purpose of heating , the oxide is made into briskets with coke and clay ZnO+C→Zn+COZnO+C→Zn+CO

    1Thank You

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    • Posted by Sujan Chakma 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Piyush Kumar 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sanjana Tyagi 8 years ago

    Do not leave chain ploymerisation

    2Thank You

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    • Posted by Marvi Gupta 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    Because of its larger size, compared with oxygen, the sulphur atom tends not to form double bonds with other sulphur atoms.* (As is the case with the other elements in the same period ... e.g. nitrogen is N2, but white phosphorus is P4). S8 is a cyclic, non-planar (to avoid bond strain) molecule. *(because the atoms are not close enough for the sideways-overlap of p-orbitals to produce the pi-bond)

    1Thank You

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    • Posted by Vishal Tutlani 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    Alc KOH dissociates in water to give RO- ions which is a strong base and abstracts hydrogen giving rise to elimination where Aq KOH dissociates in water giving - OH ions which is a good nucleophile and prefers substitution .thus giving diff products

    6Thank You

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    • Posted by Nauman Akhtar 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    Properties of rubber are improved by compounding it with some chemicals like sulphur, hydrogen sulphide, etc. Vulcanization is a chemical process for converting natural rubber or related polymers into more durable materials via the addition of sulphur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains. Extent of stiffness of vulcanized rubber depends on the amount of sulphur added. E.g. Tyre rubber has 3 to 5% sulphur.

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    • Posted by Imran Khan 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Nauman Akhtar 8 years ago

    1) In the production of carbonated beverages-in order to increase the solubility of CO2 in cold drinks,beer etc,the bottle are sealed under high pressure.When the bottle is opened under normal atmospheric pressure,the pressure inside the bottle falls to atmospheric pressure & the excess CO2 bubbles out of the bottle causing effervescence. 2) At high altitudes-the partial pressure of oxygen at high altitudes is less than the ground level.this results in low concentration of oxygen in the blood & tissues of the peoples 3) In scuba diving- during scuba diving,when the diver breaths in compressed air from the supply tank,more nitrogen dissolves in the blood & other body fluids because the pressure at that depth is far greater than the surface atmospheric pressure.

    2Thank You

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    • Posted by Kshitij Sharma 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Krystal Yadav 8 years ago

    Liberman test ,fecl3 test

    0Thank You

    ANSWER

    • Posted by Jit Kalita 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Rohit Thakur 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    The Sandmeyer reaction is a chemical reaction used to synthesize aryl halides from aryl diazonium salts.

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    • Posted by Priyanshu Prakash 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    In a d–d transition, an electron in a d orbital on the metal is excited by a photon to another d orbital of higher energy. In complexes of thetransition metals, the d orbitals do not all have the same energy. In centrosymmetric complexes, d-d transitions are forbidden by the Laporte rule.

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    • Posted by Aashu Verma 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    Isomerism is the phenomenon whereby certain compounds, with the same molecular formula, exist in different forms owing to their different organisations of atoms.

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    • Posted by Shristi Sinha 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sunaina Gupta 8 years ago

    Sulphur is used to prevent the subsequent hydrogenation in aldehydes

    2Thank You

    ANSWER

    • Posted by Sudhansh Tiwari 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Anjali Sharma 8 years ago

    Because of p-p overlapping resulting into the triple bond, N triple bond N has high bond dissociation energy.

    0Thank You

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    • Posted by Sadique Khan 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Vinay Sen 8 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Amar Kumar 8 years ago

    Rectified spirit or neutral spirits, rectified alcohol, or ethyl alcohol of agricultural origin is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It is a mixture of ethanol (95.6 per cent) and water produced as an azeotrope by distillation.

    1Thank You

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    • Posted by Nitesh Yadav 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Aakanksha Agrawal 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Mayank Sharma 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
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    • Posted by Shalu Prasad 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Atul Chaudhary 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Piyush Kumar 8 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

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