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    • Posted by Ankit Gupta 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Arti Vishwakarma 7 years ago

    Ammonia is a stronger base than phosphine because in ammonia the central atom Nitrogen is smaller hence electron density is concentrated with in smaller range and easily available. Whereas in the case of phosphine the size of phosphorous is large electron cloud is distributed in large area & not easily available.

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    • Posted by Ruvan Deep 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
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    • Posted by Muskan Singh 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    S M 7 years ago

    A4B3?

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    • Posted by Diksha Yadav 7 years ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Aryan Rai 7 years ago

    If you have either of two gmail or WhatsApp. You can provide me here. I'll send you. It also depends through which medium you are comfortable with. So either quote your gmail id here or your number.

    0Thank You

    Diksha Yadav 7 years ago

    I meant that how i can achieve ur notes

    0Thank You

    Aryan Rai 7 years ago

    What does this mean?

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    • Posted by Shivam Singh 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Ankur Vijayvargiya 7 years ago

    It is the movement of water molecules from a region of high concentration to a region of low concentration, through a selectively permeable membrane

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    • Posted by Sweta Kumari 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
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    • Posted by Adithya Narayan 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years ago

    The development of graphene is taking place at a rapid pace. The nanomaterial can produced by many different methods, each of which produces different forms of graphene. These forms have often radically different qualities, which are suited for use in different applications. The exotic properties of graphene make it an attractive proposition to develop for use in many different types of device. Graphene is impermeable to all gases and is capable of sustaining high densities of electric current.

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    • Posted by Sugandh Varshney 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Saumya Agrawal 7 years ago

    Make it cholorobenzolene by chronination and apply fittig reaction

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    • Posted by Akash Singh 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Unknown Student 7 years ago

    BH3 exists, but as a dimer (B2H6 ) due to electron deficient nature.

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    • Posted by Sujjet Valmiki 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
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    • Posted by Vinay Kumar 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Gaurav Seth 7 years ago

    Calcination refers to a process by which an ore, mainly carbonate and hydroxide,is heated in the absence of air to make it into an oxide ore.

    <hr />

    The carbonate ores are converted into oxides by heating strongly in presence of limited air is called calcination.

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    • Posted by Vivek Dubey 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years ago

    Van Arkel method for refining impure titanium. Mond's process for refining impure nickel.

    Ultra pure metals are being prepared by the Van Arkel Method. The compound so formed is then decomposed by heating to get the pure metal. Van Arkels method is used to purify crude titanium metal. It is heated with iodine to about 500K to form volatile compound.

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    • Posted by Ponnu P 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
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    • Posted by Tanya Majumdar 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Mayank Singh 7 years ago

    Activation energy decreses on adding catalyst And gibss energy remain same no effect on it

    1Thank You

    Danish Khan 7 years ago

    Hlw

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    • Posted by Kartiki Jat 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Manoj Mass 7 years ago

    Add diazonium salt...phenol will give red dye but benzoic wont give

    1Thank You

    Jashaswi Talukdar 7 years ago

    Lucas test

    1Thank You

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    • Posted by Tejaswini Rastogi 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
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    • Posted by Banani Das 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
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    • Posted by Varun Khurana 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yash Anand 7 years ago

    Polymers can be classified on the basis of molecular forces like vander waals forces, hydrogen bonds & dipole dipole interactions.They are classified as : 1 elastomers- they have elastic character & have weak intermolecular forces.Eg natural rubber 2 Fibres- thay have strong hydrogen bond or dipole dipole interactions between polymers chain.Eg nylon 6,6 3 Thermoplastics- they have intermolecular forces intermediate between elastomers & fibres.Eg polythene 4 Thermosetting polymers- they undergoes permanent change on heating.Eg bakelite Therefore, Neoprene < polyvinyl chloride < Nylon 6.. I hope u r clear now..

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    • Posted by Aryan Rai 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Mansi Sharma 7 years ago

    First of all u need to learn all the name rxn` s and others and then start. There is no other option for this .

    2Thank You

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    • Posted by Shubhra Jyot 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Ha Rshit 7 years ago

    Carryminati is a YouTuber

    2Thank You

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    • Posted by Ashutosh Rastogi 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Pavankumar Anand 7 years ago

    Density=( (molecular mass / Na) × (no of atoms in a unit cell) ) /volume you can equate this and get your answer

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    • Posted by Aman Singh 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    O Singh 7 years ago

    Azodye test( coupling reaction)

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    • Posted by Shivani .. 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Arti Vishwakarma 7 years ago

    Due to absence of any active site in their molecules, divalent oxygen is linked to carbon atoms on both sides ( c-o-c) .

    1Thank You

    Aryan Rai 7 years ago

    Ethers are inert to most chemical reactions. Because,it is quite unreactive. diethyl ether makes an excellent solvent for many reactions. Many more organic compounds will dissolve in ether than in hydrocarbons, because the oxygen atom in ethers imparts some polar character to the ether molecule.

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    • Posted by Shivani .. 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Aryan Rai 7 years ago

    Zwitterion formerly called a dipolar ion, is a neutral molecule with both positive and negative electrical charges. (In some cases multiple positive and negative charges may be present.) Zwitterions are distinct from molecules that have dipoles at different locations within the molecule.

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    • Posted by Saumya Agrawal 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
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    • Posted by Abhi Soni 7 years ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Shubhendu Tiwari 7 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 7 years ago

    Entropy is a measure of degree of randomness of a system. Thus, if entropy increases the randomness also increases. The process which are generally accompanied by increases in entropy are generally called spontaneous or entropy driving reactions.

    A reaction takes place spontaneously if ∆G < 0.

    Now, ∆G=∆H-T∆S.

    If change in entropy ∆S is positive and large enough to make ∆G < 0 (when ∆H > 0), then the reaction proceeds in forward direction just because of positive entropy change and then the reaction is called entropy-driven reaction.

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    • Posted by P S 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    P S 7 years ago

    Thanks yogita ji

    2Thank You

    Yogita Ingle 7 years ago

    There are two reasons for this:
    1. Aromatic acids are stronger acids than the aliphatic acids. Since the benzene ring has -I effect, it causes stronger hydrogen bonds between molecules. This tend a close arrangement of molecules. So, the molecules are generally solid.
    2. Aromatic acids are higher molecular weight compounds. Compounds with high molecular weight are solids.

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    • Posted by P S 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Manish Yadav 7 years ago

    Due to its resonance with the oxygen of OH group.

    1Thank You

    Kiara Khurrana 7 years ago

    due to carbanion

    1Thank You

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    • Posted by P S 7 years ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    P S 7 years ago

    Thanks yogita ji

    1Thank You

    Yogita Ingle 7 years ago

    In chloroacetic acid inductive effect due to the presence of chlorine group increases the polarity of hydroxide bond and thus makes it more acidic as compared to acetic acid.

    Chlorine being a strong electron with drawing group. pulls the negative charge toward it self by inductive effect so that the negative charge density on the oxygen atom is reduced hence stabilizing the conjugate base of chloroacetic acid whil the negative charge of the oxygen atom in acetic acid is localized  and the conjugate  base is less stable.   

     

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