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NEET Chemistry Preparation 2019

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Test schedule

9/30/2018
Test on
  • Physics

    U&D

  • Chemistry

    Periodic Properties (I)

  • Biology

    Diversity in the living world

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10/7/2018
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  • Physics

    Vector

  • Chemistry

    Nomenclature (O)

  • Biology

    Biological Classification

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9/30/2018
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  • Physics

    Geo-Optics

  • Chemistry

    Solid State (P)

  • Biology

    Reproduction in organisms

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10/7/2018
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  • Physics

    Wave Optics

  • Chemistry

    Co-ordination Compound (I)

  • Biology

    Sexual Reproduction in flowering plants

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9/30/2018
Test on
  • Physics

    U&D, Vector, Kinematics (11th)

  • Chemistry

    Periodic Properties (I) , Atomic Structure (P) , Nomenclature (O)

  • Biology

    Diversity in the living world, Reproduction in organisms

Take test
10/7/2018
Test on
  • Physics

    Geo-Optics, Wave Optics (12th)

  • Chemistry

    Solid State (P) , Chemical Bonding (I)

  • Biology

    Biological Classification, Sexual Reproduction in flowering plants

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13th Aug, 2018 - 18th Aug, 2018
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NEET Tests & Papers Solutions

NEET Chemistry Formulas

NEET Chemistry Formulae

The Mole Concept

One Mole = Avogadro's Number [NA] = 6.023 x 1023. It is the number of atoms present in exactly 12 g of C -12 isotope.

Atomic weight [A] : Atomic weight is the relative weight of one atom of an element with respect to a standard weight

begin mathsize 12px style straight A equals fraction numerator weight space of space one space atom space of space an space element over denominator 1 half the space part space by space weight space of space an space atom space of space straight C minus 12 end fraction end style

isotope u (atomic mass unit) weight :

One amu = begin mathsize 12px style 1 over 12 end stylethe part by weight of an atom of C - 12 isotope = begin mathsize 12px style 1 over straight N subscript straight A straight g end style = 1.66 × 10-24g

  • Atomic Weight (A) × u = Absolute atomic weight.
  • Atomic weight is a relative weight that indicates the relative heaviness of one atom of an element with respect to amu weight.
  • Atomic weight has no unit because it is the ratio of weights.
  • One mol of an u = 1.00 g

Change of scale for atomic weight : If an amu is defined differently as (1/x) th party by weight of an atom of C-12 isotope rather (1/12) th part than the atomic weight (A') can be derived as :

begin mathsize 12px style straight A ` equals straight A open parentheses straight x over 12 close parentheses end style

where, A= conventional atomic weight.

Molecular weight (MW) : Like atomic weight, it is the relative weight of a molecule of a compound with respect to amu weight.

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