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    • Posted by Kunal Bumla 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 2 answers

    Sanoj S Nair 8 years, 1 month ago

    Change your thinking .....don't say that I want 40+ OK say that I want 100 OK then only u will get atleast 40 OK got me?

    1Thank You

    Neha Sorout 8 years, 1 month ago

    Please try to understand the topic first then try to attempt some small questions to increase your confidence . Then try long questions. Be sure to have understand the topic first . Try to do all proofs and examples given in NCERT

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    • Posted by Divyashri D 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Praveen Hegde 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Mihir Kumar Jha 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 3 answers

    Manjeet Singh 8 years, 1 month ago

    The remaining velocity after used instead photoelectric effect

    0Thank You

    Bhavesh Batra 8 years, 1 month ago

    The minimum frequency below which the photoelectric effect is not observed os known as THRESHOLD FREQUENCY.

    0Thank You

    Vaishnavi Soni 8 years, 1 month ago

    Threshold frequency is defined as the minimum frequency of incident light which can cause photo electric emission i.e. this frequency is just able to eject electrons with out giving them additional energy. It is denoted by Vo.

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    • Posted by Rahul Singson 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Ash Ish 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 1 answers

    Manjeet Singh 8 years, 1 month ago

    1??

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    • Posted by Mayank Dhiman 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Mayank Dhiman 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Esha Chauhan 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Soumyodeep Chowdhury 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Mimansha Das 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 1 answers

    Amar Kumar 8 years, 1 month ago

    Le Chatelier's principle  also called Chatelier's principle or "The Equilibrium Law", can be used to predict the effect of a change in conditions on a chemical equilibrium.  It can be stated as:

    When any system at equilibrium is subjected to change in concentration, temperature, volume, or pressure, then the system readjusts itself to counteract (partially) the effect of the applied change and a new equilibrium is established.

    In other words, whenever a system in equilibrium is disturbed the system will adjust itself in such a way that the effect of the change will be nullified.

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    • Posted by Ankita Singh 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 3 answers

    Ashish Soni 8 years, 1 month ago

    Buffer action: the ability of the buffer solution to resist the changes in pH value on the addition of small amount of an acid or a base is known as buffer action.

    1Thank You

    Manjeet Singh 8 years, 1 month ago

    The property by which it resist theft change in ph value

    1Thank You

    Amar Kumar 8 years, 1 month ago

    Buffer action: the ability of the buffer solution to resist the changes in pH value on the addition of small amount of an acid or a base is known as buffer action.

    For example: consider an acidic buffer such as a solution containing an equimolar amounts of acetic acid and sodium acetate, the solution contains a large number of sodium ions (Na+), acetate ions (CH3COO–) and also a large number of undissociated acetic acid molecules.

    CH3COONa (aq) ————-> CH3COO– (aq) + Na+ (aq)

    Suppose, a few drops of HCl are added to this buffer solution. This would provide hydrogen (H+) ions. These additional H+ ions would combine with the large reserve of CH3COO– ions to form undissociated acetic acid molecules.

    CH3COO– (aq) + H+ (aq) ⇌ CH3COOH

    The additional H+ ions are neutralized by CH3COO– ions in the solution, hence there will be no change in its pH value. The reserve basicity of the solution is due to acetate ions.

    2Thank You

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    • Posted by Nitish Gaur 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 2 answers

    Manjeet Singh 8 years, 1 month ago

    They water which contain more hydrogen isotope

    0Thank You

    Amar Kumar 8 years, 1 month ago

    Heavy water: water in which the hydrogen in the molecules is partly or wholly replaced by the isotope deuterium, used especially as a moderator in nuclear reactors.

    Heavy water is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium, rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.

    Formula: D2O

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    • Posted by Anura T 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Kanishka Nagar 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Navneet Kaur Virk 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 2 answers

    Nikhil Bajaj 8 years, 1 month ago

    Compounds of C and O are known as organic compounds earlier it was that componds from living is called organic compounds

    2Thank You

    Manjeet Singh 8 years, 1 month ago

    Which are made by carbon ?

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    • Posted by Sanjoli Mangal 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Priya Sharma 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 2 answers

    Ashish Soni 8 years, 1 month ago

    The energy which is released when two or more ion combine to form ionic compound

    0Thank You

    Manjeet Singh 8 years, 1 month ago

    The energy released when ironic compound form ?

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    • Posted by Rupesh Tanwar 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Raj Singh 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 4 answers

    Ashish Soni 8 years, 1 month ago

    The heat energy released when new bonds are made between the ions and water molecules is known as the hydration enthalpy of the ion. The hydration enthalpy

    0Thank You

    Ashish Soni 8 years, 1 month ago

    Sorry

    0Thank You

    Ashish Soni 8 years, 1 month ago

    Viroids are free RNA molecules of low molecular weight without any protein coat while viruses can have either RNA or DNA molecules encapsulated in a protein coat. Viroids are smaller in size than viruses.

    0Thank You

    Manjeet Singh 8 years, 1 month ago

    They energy released for hydrogen compound

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    • Posted by Rupesh Tanwar 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 2 answers

    Manjeet Singh 8 years, 1 month ago

    Because it stops effect of oxygen

    0Thank You

    Jyoti Ranjan 8 years, 1 month ago

    Because it stops the fuel(oxygen) to burn. Hence the fire stops because of lack of Oxygen

    2Thank You

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    • Posted by Krishnam Rastogi 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 2 answers

    Manjeet Singh 8 years, 1 month ago

    Plus charge elements are metals and minus charge elements are non metals

    0Thank You

    Priya Sharma 8 years, 1 month ago

    By the valency of their elements +1or_1

    2Thank You

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    • Posted by Sachin Choudhary 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 1 answers

    Pratham Singh 8 years, 1 month ago

    Treatment of AIDS

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    • Posted by Tushar Mirchandani 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 1 answers

    Mihir Kumar Jha 8 years, 1 month ago

    SPECIFIC HEAT CAPACITY DEFINITION Specific heat capacity is the amount of heat energy required to raise the temperature of a substance per unit of mass. The specific heat capacity of a material is a physical property. It is also an example of an extensive property since its value is proportional to the size of the system being examined. In ​SI units, specific heat capacity (symbol: c) is the amount of heat in joules required to raise 1 gram of a substance 1 Kelvin.

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    • Posted by Ashish Mishra 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Vishwa Bhavsar 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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    • Posted by Vishal Kumar 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Nikhil Kumar 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
    ANSWER

    • Posted by Vishal Kumar 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 3 answers

    Manjeet Singh 8 years, 1 month ago

    Very nice pooja ?????

    0Thank You

    Amar Kumar 8 years, 1 month ago

    1. Hydrogen Bonds: Water is a polar molecule that tends to be slightly positive on the hydrogen side and slight negative on the oxygen side.  The electrostatic bond between the positive hydrogen side of this molecule and other megative ions or polar molecules is called a hydrogen bond. Molecules and ions with which water forms hydrogen bonds (such as sodium chloride) are hydrophylic. On the other hand, Ions and molecules that do not form hydrogen bonds with water are hydrophobic.
    2. Liquidity at Room Temperature: At room temperature, most compounds with low molecular weights take gaseous form. With water, however, hydrogen bonding helps to keep it a liquid at room temperature. Kept relatively close together, the moluecules at room temperature are unable to dissipate sufficiently to form a gas. Temperatures of 212°F (or 100°C) are required to break the hydrogen bonds and convert liquid water into water vapor.
    3. Chemical Reactions: When ionic compounds such as sodium chloride are added to water, hydrogen bonding will tend to pull those ionic compounds apart. This makes water a natural solvent. Once ionic compounds dissolve, their anions and cations circulate through the water allowing further reactions to occur. Thus, water also sponsors and facilitates chemical reactions.
    4. Stable Temperatures: Water takes more heat to raise its temperature than other common compounds, since much of that heat is required to first break the hydrogen bonds. Water also retains heat, so its temperature falls slowly. This means that larger systems of water (such as the ocean or a body) tend to maintain more or less constant temperatures, which in turn helps the earth (and us) to maintain relatively constant temperatures.
    5. Freezing Point :At 32°F (or 0°C) and below, water molecules form hydrogen bonds in a chrystalline lattice structure. This bonding spaces the molecules a bit farther apart than usual, causing water to expand when it freezes. This results in ice being less dense than liquid water, which is why ice floats.

    0Thank You

    Pooja Choudhary 8 years, 1 month ago

    Chemical formula H 2OMolar mass18.01528(33) g/molAppearanceWhite solid or almost colorless, transparent, with a slight hint of blue, crystalline solid or liquid[2]OdorNoneDensityLiquid:[3] 0.9998396 g/mL at 0 °C 0.9970474 g/mL at 25 °C 0.961893 g/mL at 95 °C Solid:[citation needed] 0.917 g/ml ≈ 57.2 lb/ft3Melting point0.00 °C (32.00 °F; 273.15 K) [a]Boiling point99.98 °C (211.96 °F; 373.13 K) [4][a]SolubilityPoorly soluble inhaloalkanes,aliphatic andaromatichydrocarbons,ethers.[5] Improved solubility incarboxylates,alcohols, ketones,amines. Miscible with methanol, propanol,isopropanol, glycerol,1,4-dioxane,tetrahydrofuran,acetaldehyde,dimethylformamide,dimethoxyethane,dimethyl sulfoxide.Vapor pressure3.1690 kilopascals or 0.031276 atm[6]Acidity (pKa)13.995[7][b]Basicity (pKb)13.995Thermal conductivity0.6065 W/m·K[9] Refractive indexD) 1.3330 (20°C)[10]

    1Thank You

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    • Posted by Atul Chauhan 8 years, 1 month ago

    CBSE > Class 11 > Chemistry
    • 0 answers
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