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