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    • Posted by Sanjay Vajpayee 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sia ? 6 years, 6 months ago

    Rate of a reaction depends upon the concentration of the reactant as the concentration of the reactant decreases , the rate also decreases. As a result, for the reactant, the rate is indicated by a negative sign .

    0Thank You

    Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

    the main reason behind is that the rate of rxn keep on fluctuating with respect to time due to the concentration of reactant and product hence rate of rxn not remain constant throughout the rxn.

    2Thank You

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    • Posted by Simmi Sharma 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Simmi Sharma 6 years, 6 months ago

    Thanku..

    0Thank You

    Ajit Sharma 6 years, 6 months ago

    Volume of the solution = Mass of the solvent + Mass of the solute

                                        = 200 g + 20 g = 220 g

    Density of the solution = Mass of the solution/ Volume of the solution

                   1.25 g / mL = 220/ volume of the solution

    Volume of the solution = 220 / 1.25 = 176 ml

    Normality of the solution = no. of gram equivalent of solute /volume of the solution in L

                                            = (20/49) / (176 x 10-3)  N = 2.32 N

    ( Equivalent Mass of Sulfuric Acid is 49 g )

     

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    • Posted by Muskan Birhman 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sia ? 6 years, 6 months ago

    Propyne is CH3-C=-CH 
    CH3-C=CH + Hg2+ + H2O {tex}\rightarrow{/tex} CH3-CO-CH3 
    CH3-CO-CH3 + LiAlH4 {tex}\rightarrow{/tex} CH3-CH(OH)-CH3 (2-propanol) 
    CH3-CH(OH)-CH3 + H2SO4 + H2O {tex}\rightarrow{/tex} CH3-CH=CH2 (propene) 
    CH3-CH=CH2 + BH3 + H2O2/OH- {tex}\rightarrow{/tex} CH3-CH2-CH2OH 
    This is hydroboration oxidation 
    CH3-CH2-CH2OH  + PCC {tex}\rightarrow{/tex} CH3-CH2-CHO (propanal) 

    3Thank You

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    • Posted by Ramneet Sekhon 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Amit Yadav 6 years, 6 months ago

    Zn ----->Zn^2+ +2e-. At anode oxidation half reaction. Cu^2+ +2e- ---------->Cu At cathode reduction half reaction.

    1Thank You

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    • Posted by Arman Arora 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Hemant Tiwari 6 years, 6 months ago

    Neurotransmitters are endogenous chemicals that enable neurotransmission. It is a type of chemical messenger which transmits signals across a chemical synapse, such as a neuromuscular junction, from one neuron (nerve cell) to another "target" neuron, muscle cell, or gland cell.

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    • Posted by Pandia Raj 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Ayush Yadav 6 years, 6 months ago

    Non polar solvent

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    Arjita Singh 6 years, 6 months ago

    Naphthalene (c^10h^8)important hydrocarbon composed of two benzene rings sharing two adjacent carbon atoms. A white, waxy solid,naphthalene is soluble in ether and hot alcohol and is highly volatile

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    • Posted by Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

    Okk thanks a lot

    0Thank You

    Jasnoor Grewal 6 years, 6 months ago

    Physisorption always decreases with increase in temperature bcz kinetic energy of particles increases;so they don't settle on the surface of the adsorbent. But in chemisorption,as we increase the temp. ,the rate ot reaction increases and so,adsorption increases;but only till the reaction is complete.After that,the rate decreases with increase in temp,as in case of physisorption.

    1Thank You

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    • Posted by Aman Kumar 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 6 answers

    Aman Kumar 6 years, 6 months ago

    Ohk....thanks BTW?

    0Thank You

    Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

    ? ? ? aesa hai ager ye question tumhari khud ki side se hai toh meri maano jesa hai rehne do.... as ye tumhara dimag hai bahut kuch soch ra hoga.... baaki book ke hisab se ye question aaya hai toh ek baar Google ker lo. ? baaki concern to higher baad mein mujhe bhe bta Dena answer. ?

    1Thank You

    Aman Kumar 6 years, 6 months ago

    Yaah...ur answer is absolutely correct but..I want ask that kya henry's law mai hum mole fraction ke jagah pe molality ya molarity nhi ho sakta???.....as all these molality , molarity nd mole fraction are use to check concentration in a solution...

    0Thank You

    Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

    but if it's wrong then surely inform the correct one. ?

    0Thank You

    Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

    might be this will be the answer

    2Thank You

    Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

    The most commonly form of Henry law states that - - - The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in solution. i. e, P=kH X. as mention in ur question. so in this case we considered Raoults law which is a special case of Henry's law . if we compare the eq. of Henry law and Raoults law it can be seen that the partial pressure of volatile component or gas is directly pro. to it's mole fraction in the solution. only the kH differ from P°A thus, from this we conclude that it is true for mole fraction only.

    2Thank You

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    • Posted by Saleheen Ali 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Ajit Sharma 6 years, 6 months ago

    Molal depression constant of water (Kf ) = 1.86 K kg mol-1

    Density of water = 1 g / cc = 1 kg / L

    Given ,Volume of water = 1 L

    Therefore mass of water = 1 kg

    Freezing point = -20oC = ( 273-20) K= 253 K

    Freezing point of water = 273 K

    Hence, depression in freezing point = Kf  x  m   (m= molality )

    (273-253) K = 1.86 K kg mol-1 x (moles of ethyl alcohol) /mass of solvent in kg

    20 = 1.86 x ( moles of ethyl alcohol) / 1 Kg

    moles of ethyl alcohol = 20/1.86 = 10.753 mol

    Mass of 10. 753 mol of ethyl alcohol = 46 x 10.753 g = 494.638 g.

    So , more than 494.638 g will be added to lower the freezing point.

     

    ΔΔ Δ

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    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sia ? 6 years, 6 months ago

    fat is the dispersed phase and water is the dispersion medium.

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    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sia ? 6 years, 6 months ago

    Aerosol

    Examples of natural aerosols are fog, dust, forest exudates and geyser steam. Examples of anthropogenic aerosols are haze, particulate air pollutants and smoke.

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    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sia ? 6 years, 6 months ago

    Coagulation takes place.

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    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sia ? 6 years, 6 months ago

    Dye test

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    ANSWER

    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sia ? 6 years, 6 months ago

    The stability of lyophilic sols is a result of two factors, the presence of a charge and the solvation of colloidal particles. On the other hand, the stability of lyophobic sols is only because of the presence of a charge. Thus, the lyophilic sol is more stable than lyophobic sol due to the extensive solvation.

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    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sia ? 6 years, 6 months ago

    The Brownian movement arises due to the unbalanced bombardment of particles by the molecules of the dispersion medium. The Brownian movement has a stirring effect which does not permit the particles to settle and thus, is responsible for stability of sols.

    0Thank You

    Aman Kumar 6 years, 6 months ago

    A rapid and zig zag movement of partical when they collide with other particals is called Brownian motion...

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    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Sia ? 6 years, 6 months ago

    Gelatin is used in ice cream to give it a soft texture and fresh appearance. Only a little bit of gelatin is enough to make our ice creams soft and fresh. Gelatin absorbs free water in the ice cream and prevent the formation of large crystals. It also gives the less watery taste to an ice cream.

    0Thank You

    Ashish Singh 6 years, 6 months ago

    Gulatin reduce the water that are present in the ice cream which makes the ice cream soft and songy and testy

    0Thank You

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    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sia ? 6 years, 6 months ago

    As we know artificial rainfall occurs when oppositely charged clouds meets. Since, clouds are colloidal in nature and carry charge. Spray of silver iodide, an electrolyte from aeroplane results in coagulation of colloidal water particles leading to rain. Sometimes electrified sand is also used for this purpose.

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    • Posted by Abhishek Pandey 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Sia ? 6 years, 6 months ago

    Gold sol is a solvent repelling sol i.e., a lyophobic sol and unstable in nature. Addition of gelatin stabilises the gold sol because gelatin forms lyophilic sol and act as a protective colloid.

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    • Posted by Paras Boriwal 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Abhishek Pandey 6 years, 6 months ago

    2.56×10^-5

    0Thank You

    Nishu Sahu 6 years, 6 months ago

    The rate of appearances of so3 is 1.28*10^-5

    0Thank You

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    • Posted by Nidhi Brar 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Kirandeep Brar 6 years, 6 months ago

    Please help me in my ques.

    0Thank You

    Sia ? 6 years, 6 months ago

    Get last year papers here : <a href="https://mycbseguide.com/cbse-question-papers.html">https://mycbseguide.com/cbse-question-papers.html</a>

    0Thank You

    ANSWER

    • Posted by Honey Singh 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Honey Singh 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Abhishek Pandey 6 years, 6 months ago

    Becouse for the reaction with more then 3 molecularity simultaneous collision of more then three reactant molecule happens which only happens in rare cases that's why these reactions are rare

    1Thank You

    #¥Uvi Rana Rajput 6 years, 6 months ago

    This is because there are rare chances of simultaneous collision with three or more particle

    2Thank You

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    • Posted by Siya Jain 6 years, 6 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Prabhat Emmanuel 6 years, 6 months ago

    Not more than 15 marks in each subject.

    1Thank You

    Honey Singh 6 years, 6 months ago

    30

    1Thank You

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    • Posted by Solly Yadav 6 years, 7 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Abhishek Pandey 6 years, 6 months ago

    0.9030

    1Thank You

    Sia ? 6 years, 6 months ago

    Steps

    • Separate the characteristic and the mantissa. Consider the number under observation.
    • Use the antilog table to find a corresponding value for your mantissa.
    • Find the value from the mean difference columns.
    • Add the values obtained in the previous steps.
    • Insert the decimal point

    1Thank You

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    • Posted by Sunidhi Yadav 6 years, 7 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Gursharn Kaur 6 years, 6 months ago

    Absorption is a process of uniform distibution of absorbate throughout the body even in its inner surfaces

    0Thank You

    Ashish Singh 6 years, 7 months ago

    Absorption takes place inner surface of substance

    2Thank You

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    • Posted by Tarun Jakhar 6 years, 7 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    S S 6 years, 6 months ago

    EDTA(ethylenediaaminetetraacetate) ....

    0Thank You

    Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

    cobalt I guess ?

    1Thank You

    ANSWER

    • Posted by Raviraj Singh 6 years, 7 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Tarun Jakhar 6 years, 7 months ago

    Diethyl ether is an especially good solvent for the formation of Grignard reagents because ethers are non-acidic (aprotic). Water or alcohols would protonate and thus destroy the Grignard reagent, because the Grignard carbon is highly nucleophilic. This would form a hydrocarbon.

    1Thank You

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    • Posted by Kiran Ghuman 6 years, 7 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Tarun Jakhar 6 years, 7 months ago

    Osmotic pressure has advantages for finding out the molar mass over other collegative properties as pressure measurement is around room temperature and molarity is used instead of molality. As compared to the other collegative properties osmotic pressure's magnitude is large enough even for the dilute solution

    1Thank You

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    • Posted by Solly Yadav 6 years, 7 months ago

    CBSE > Class 12 > Chemistry
    • 3 answers

    Vivek Kumar 6 years, 6 months ago

    0.9

    0Thank You

    Tarun Jakhar 6 years, 7 months ago

    0.90

    0Thank You

    Aman Kumar 6 years, 7 months ago

    0.903

    1Thank You

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    • Posted by Rishita Shishir ?✏ 6 years, 7 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Rishita Shishir ?✏ 6 years, 6 months ago

    Thanks a lot ??✌

    2Thank You

    Ďãřşháñăã Yadav ? ? ? 6 years, 7 months ago

    to find log(0.130 *10^8) ....it becomes 1.30log + 8log(10) now see log table... 0.113 +8 =8.113 now subtract 1 from the final result u will get the answer 7.113.___ hope it clear. ✌️

    2Thank You

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