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LUCENT CHEMISTRY
  • Harsh Daddy

  • 問題数 100 • 10/3/2023

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    問題一覧

  • 1

    Presence of what makes CFLs glow

    plasma

  • 2

    Fluroscent tube and CFL bulbs contain

    inert gas

  • 3

    Process of direct conversion of vapor into solid is

    Hoar frost

  • 4

    Atomic mass is the number which state that how many times the mass of one atom of an element is what part heavier than one atom of carbon 12

    1/12

  • 5

    what is radioactive isotopes of hydrogen

    Tritium

  • 6

    Atom/molecule/ions containing same number of electrons

    isoelctric

  • 7

    when a helium atom looses two electron it become a positively charged

    helium ion

  • 8

    double positively charged He++ is called

    Alpha particles

  • 9

    James clark Maxwell stated that X-ray , Y-ray , heat etc Emmit energy continuously in the form of radiations or waves and the energy is called

    Radiant energy

  • 10

    when did James clark Maxwell discovered radiant energy

    1886

  • 11

    waves associated with electric as well as magnetic field is known as

    electro magnetic waves or radiant

  • 12

    Distance between two consecutive Crest or trough is called

    wavelength

  • 13

    wavelength is denoted by

    Lamda

  • 14

    Number of wave passing through a point in one second is called

    frequency

  • 15

    Si unit of frequency is

    hertz

  • 16

    number of wavelength which can be accomodated in one cm length along the direction of propogation is called

    wave number

  • 17

    Radiant energy is emmited or absorbed in the form of small energy packets called

    quanta

  • 18

    Plank's quantum theory on radiation is given on

    1900

  • 19

    seven color band is called

    spectrum

  • 20

    When spectral lines are obtained from atomic spectra are placed in a magnetic field and they are splitted into number of fine lines this is called

    zeemans effect

  • 21

    When spectral lines obtained from atomic spectra are placed in a electric field they are splitted into number of fine lines called

    stark's effect

  • 22

    when radiation with certain minimum frequency strike the surface of metal then the electrons are ejected from the surface of metal this phenomenon is called

    photoelctric effect

  • 23

    set of four intrgers required to define an electron completely in an atom is called

    Quanta number

  • 24

    who classified element into metal and non metal

    lavoisier

  • 25

    Total period in periodic table in newland table

    7

  • 26

    Total groups in periodic table in newland table

    9

  • 27

    modern periodic Law was given by

    mooseley

  • 28

    Number of period in modern periodic table

    7

  • 29

    How many Groups are there in modern periodic table

    18

  • 30

    S-block contain

    Both Alkali and alkaline

  • 31

    which group comes under S-block

    1- 2

  • 32

    First rare metal is

    cerium

  • 33

    which element has lower ionization potential

    caseium

  • 34

    what is used as a moderator in nuclear reactor

    heavy water

  • 35

    Hydrogen is used as antiseptic under the name of

    perhydrol

  • 36

    which of the following is used as hair bleach

    hydrogen

  • 37

    Permanent hardness is removed by

    Permutit process

  • 38

    Temporary hardness is removed by

    Clark's method

  • 39

    It is the only element in periodic table having zero neutron

    Protium

  • 40

    Hydrogen have how many isotopes

    3

  • 41

    Which of the following is not the isotopes of hydrogen

    Plutonium

  • 42

    how many non metal are there in periodic table

    24

  • 43

    A series is obtained by arranging the metals in decreasing order of reactivity which is known as

    activity series

  • 44

    The lowest temperature at which an oil gives sufficient vapour to form an explosive mixture with air is known as

    flash point of the oil

  • 45

    Flash point of india is fixed at

    44 C

  • 46

    It is the percentage of cetane by volume in a mixture of cetane and a methyl napthalene

    cetane number of diesel oil

  • 47

    To reduce knocking property of fuel certain chemical is added in it these are called

    antiknock compound

  • 48

    Electron affinity increases from

    left to right

  • 49

    Electron affinity decreases from

    Top to bottom

  • 50

    electronegativity increases from

    Left to right

  • 51

    electronegativity decrease from

    Top to bottom

  • 52

    For Ionic compound electronegativity is greater then

    1.7

  • 53

    For polar covalent compound electronegativity is less than

    1.7

  • 54

    For non-polar covalent compound electronegativity is

    0

  • 55

    Amount of energy released during formation of one mole of Ionic compound from its constitutent ions

    Lattice energy

  • 56

    The amount of energy released during dissolution of one mole of compound into water is called

    hydration energy

  • 57

    If hydration energy is greater than Lattice energy then the compound is

    soluble in water

  • 58

    when covalent bond is formed between two similar atoms of an element is called

    Non polar covalent bond

  • 59

    when covalent bond is formed between different atoms of an element is known as

    polar covalent bond

  • 60

    It is a special type of covalent bond in which one atom donates electron to other atom , the bonding between donor to acceptor is

    co-ordinate bond

  • 61

    which element has all three types of bond

    ammonium chloride

  • 62

    Bond formed by linear overlapping of atomic orbitals is known as

    Sigma bond

  • 63

    Bond formed by sidewise or lateral overlapping of atomic orbitals is called

    Pi bond

  • 64

    Phenomenon of moving of two or more atomic orbitals of equivalent energies to form new type of identical number of orbitals is called

    Hybridization

  • 65

    Amount of energy required to break one mole bond of particular type between atoms in gaseous state of substance is called

    Bond energy

  • 66

    Average equilibrium distance between centre of two bonded atoms is called

    Bond length

  • 67

    When hydrogen atom is present between two most electronegative atoms then it is bonded to one by covalent bond other by a weak force of attraction which is called

    hydrogen bond

  • 68

    This bond arises when hydrogen bonding occur between two or more molecules

    intermolecular hydrogen bond

  • 69

    when hydrogen bonding occur within molecule then it is called

    intramolecular hydrogen bond

  • 70

    The reaction in which both oxidation and reduction takes place

    Redox reduction

  • 71

    oxidation number in free state is

    0

  • 72

    Oxidation number of alkali metal is

    +1

  • 73

    oxidation number of alkaline earth metal is

    +2

  • 74

    Sum of oxidation number of atom in a molecule is

    0

  • 75

    Chemical reaction in which one substance gets oxidised as well as reduced is known as

    disproportional reaction

  • 76

    In this reaction one or more atoms or group present in organic molecule gets substituted or replaced by suitable atoms or groups

    substitutional reaction

  • 77

    when solution is composed of only two components is called

    binary solution

  • 78

    The components which is in smaller proportion or less amount in solution is called

    solute

  • 79

    The components which is in higher proportion solution is called

    solvent

  • 80

    A solution that cannot dissolve any more of the solute at a given temperature

    saturated solution

  • 81

    A solution in which more of the solute can be dissolved at a given temperature is known as

    unsaturated solution

  • 82

    At a particular temperature is one that is more concentrated than its saturated solution at that temperature

    supersaturated solution

  • 83

    It is the solution in which amount of solute present is rather small compared to the mass of solvent

    dilute solution

  • 84

    The maximum amount of solute in gram which can be dissolved in 100gm of solvent to form saturated solution at particular temperature is called

    solubility

  • 85

    when temperature is increased the the solubility of substance

    increases

  • 86

    effect of pressure on solubility of a gas in liquid was studied by

    Henry

  • 87

    effect of pressure on solubility of a gas in liquid was studied by Henry in

    1802

  • 88

    what states that mass of a gas dissolved in a given volume of a liquid at constant temperature is directly proportional to the pressure of gas present in equilibrium with liquid

    effect of pressure on solubility

  • 89

    sodium sulfate decahydrate solubility

    first increase upto 34.2 C then decreases to 32.4 C

  • 90

    Effect of temperature on solubility of Gas

    increases

  • 91

    Those properties of ideal solution which depends only on the number of particles of the solute dissolved in a definite amount of the solvent are called

    collagative properties

  • 92

    It is a membrane which allows only the movement of solvent molecules through them ex bladder of goat or pig

    semi-permeable membrane

  • 93

    The spontaneous flow of the solvent molecules from the solvent to the solution or from less concentrated solution through a semi-permeable membrane is called

    osmosis

  • 94

    In osmosis there is only flow of

    solvent molecule

  • 95

    In diffusion what flows

    Both solute and solvent

  • 96

    Osmosis takes place from

    lower to higher concentration

  • 97

    Diffusion takes place from

    Higher to lower concentration

  • 98

    It is a homogeneous solution in which size of solute particles is less then 10-⁹m

    true solution

  • 99

    It is a heterogeneous solution in which size of solute particles is less then 10⁶m

    suspension

  • 100

    size of true solution is less than

    10⁹