SureDen
A coordinate bond is formed,When the shared electron pair is provided by one of the combining atoms.
The atom, which provides the electron pair is termed as the donor atom, while
the other atom, which accepts it, is termed as the
Interatomic Forces
The forces between the atoms due to electrostatic interaction between the charges of the atoms are called interatomic forces. Th
The molecular formula of benzene has been found from analytical data, to be C6H6. Relatively higher proportion of carbon and addition of chlorine to benzene molecule indicate
Number of Atoms in a Unit Cell
A crystal lattice is made of very large number of unit cells and lattice points are the representation of constituent particles. Ther
Tracovalency
A carbon atom has a total of six electrons occupying the first two shells, i.e., the K-shell has two electrons and the L-shell has fou
In IONIC compounds, the redox reaction can be explained on the basis of electron transfer but in COVALENT compounds it is not possible. The oxidation number explains the pheno
Balancing of REDOX REACTION
Two types of Balancing of REDOX REACTION:
There are two very important met
Crystalline Solids:
Amorphous solids are very useful but most of the solids are crystalline in nature due to thermodynamically favorable conditions
Covalent Bond:-Lewis – Longmuir Concept:-
Langmuir in. 1919 improved Lewis
Alkynes contain a triple bond (≡). A triple bond has one and two bonds.
Some characteristic reactions of alkynes are,
Combustion
Dalton’s atomic theory:- In 1808 Dalton published a new system of chemical philosophy in which t
1 mole is the amount of substance that contains as many particles as there are atoms in exactly 12 g of 12C isotope.
Ethyne has a triple bond between the two carbon atoms. In the diagram each line represents one pair of shared electrons.
H — C ≡ C — H
Fundamental Concepts in Organic Reaction Mechanism
Concept of homolytic and herterolytic fission
Organic reactions usua
IUPAC system and IUPAC rules of naming hydrocarbon
IUPAC stands for International Union of Pure and Applied Science
Nomenclature
Imperfections in Solids or Crystal defects
Irregularity in the arrangement of constituent particles in solids is called crystal defect or imperfect
IUPAC system and IUPAC rules of Naming Alcohols
In the common system, alcohols are named as alkyl alcohols. The word alcohol is added after the na
Evidences in Favors of Bohr model
Stability of an atom – According to Bohr electron revolving around the nucleu
Common names of organic compounds
Common nomenclature
In the common system, cyanides are named by any of the following
Coordination number: The number of adjacent particles of atoms is called coordination number.
In both ccp and hcp, each sphere is surrounded by 12 adjacent ato
A Rutherford’s experiment on the scattering of ∝ particles (Geiger mariden Experiment):
A radioactive source of ∝ - particle like Bismuth Bi is encl
Nomenclature of carboxylic acids
Since carboxylic acids are amongst the earliest organic compounds to be isolated from nature, a large number of th
A solid is that state of matter in which its constituent atoms or molecules are held strongly at the position of minimum potential energy and it has a definite shape and volum
SOLUTIONS
A solution is a homogeneous mixture to two or more chemically non reacting substance whose composition can be varied with in certain lim
Valence shell Electron pair Repulsion theory
VSEPR Theory => It was given by Sidgwick and Powell in 1940 and was developed by Nyholm
And Gillespie in1957.
Basic Assumptions are=>
The
Physical properties of aliphatic aldehydes and ketones
Aldehydes and ketones are simple compounds which contain acarbonyl group - a carbon-oxygen d
Thomson’s Atomic Model :
J.J. Thomson suggested that atoms are just positively charge lumps of matter with electrons embedded in them like
Isomerism of alcohols
Alcohols exhibit following types of isomerism:
1. Chain isomerism
Alcohols containing&
Rutherford model of atom- IN 1911 Rutherford his coworkers performed a series of experiment known as scattering experiments. He bombarded X particles or
Test Details
In a solid ‘AB’ having the NaCl structure, ‘A’ atoms occupy the corners of the cubic unit cell. If all the
face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is
Test Details
A substance AxBy crystallizes in a face centred cubic (fcc) lattice in which atoms ‘A’ occupy each corner of
the cube and atoms ‘B’ occupy the centres of each face of the cube. Identify the correct composition of
the substance
Test Details
In closet packing of A type of atoms (radius, rA), the radius of atom B that can be fitted into octahedral void is
Test Details
In a solid ‘AB’ having the NaCl structure, ‘A’ atoms occupy the corners of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is
Test Details
In a face centred cubic arrangement of A and B atoms where A are present at the corner and B at the face centres. A atoms are missing from 4 corners in each unit cell. What is the simplest formula of the compound?
Test Details
The nearest neighbour silver atoms in silver crystal are 2.87 x 10-10 m apart. Silver crystallizes in fcc form. (Atomic mass of Ag = 108). Density of the silver metal is:
Test Details
The first ionization potential in electron volts in nitrogen and oxygen atoms are respectively given by
Test Details
Which of the following atoms will have the smallest size? [AIPMT 1989]
Test Details
A compound contains atoms of three elements A, B, and C. If the oxidation number of A is +2, B is +5 and that of C is -2, the possible formula of the compound is
Test Details
Ozazone formation involves only 2-carbon atoms of glucose because of
Test Details
Which of the following molecule does not have a linear arrangement of atoms?
Test Details
Most crystals show good cleavage because their atoms, ions or molecules are
Test Details
The ratio of mass of 1 mole of sodium and 1023 atoms of sodium is:
Test Details
Ratio of Cp and Cv of a has ‘x’ is 1.4. The number of atoms of the gas ‘x’ present in 11.2 L of it at NTP will be &nb
Test Details
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (atomic weight of Fe is 56) present in one molecule of haemoglobin are [1998]
Test Details
A compound contains atoms of three elements as A, B and C. If the oxidation number of A is +2, B is +5 and that of C is -2, the possible formula of the compound is
Test Details
Haemoglobin contain 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (at. Wt. of Fe = 56) present in one molecule of haemoglobin is
Test Details
Most crystals show good cleavage because their atoms, ions or molecules are
Test Details
A compound contains atoms of three elements A, B, and C. If the oxidation number of A is +2, B is +5 and that of C is -2, the possible formula of the compound is
Test Details
If the electronegativity difference between two atoms is 2.0, the percentage covalent character of the molecule is:
Test Details
An atom of element A has 3 electrons in its valence shell and an atom of B has 6 electrons in its valence shell. The formula of the compound between these two atoms will be:
Test Details
Linear combination of two hydridised orbitals belonging to the two atoms, each having one electron leads to a
Test Details
A compound is made up of the elements A and B crystallizes in a cubic structure. Atoms A are present on the corners as well as face centres while the atoms B are present on the edge centres as well as body centre. The formula of the compound is:
Test Details
In a face centred cubic arrangement of A and B atoms, A are present at the corners of the unit cell while B are present at the face centres. If one atom of A is missing from the position at the corner, the formula of the compound is:
Test Details
Gold has cubic crystals with unit cell edge length equal to 407.9 pm. Density of gold is 19.3 g cm-3. The number of atoms per unit cell is:
Test Details
A unit cell consists of a cube in which the atoms A are occupying the corners while the atoms B are present at the centre of each face. If the atoms A are missing from 2 corners, the simplest formula of the compound is:
Test Details
A compound formed by elements A and B crystallizes in the cubic structure where A atoms are at the corners of a cube and B atoms are at the face-centres. The formula of the compound is
Test Details
A solid has a structure in which W atoms are located at the corners of a cubic lattice, O atoms at the centre of edges and Na atom at centre of the cube. The formula for the compound is
Test Details
The atomic radius of atom is r. Total volume of atoms present in a fcc unit cell of an element is
Test Details
A substance AxBy crystallizes in a face centred cubic (FCC) lattice in which atoms ‘A’ occupy each corner of the cube and atoms ‘B’ occupy the centres of each face of the cube. Identify the correct composition of the substance AxB
Test Details
In a solid AB having the NaCl type structure, ‘A’ atoms occupy the corners of the cubic unit cell. If all the face-centred atoms along one of the axes are remove, then the resultant stoichiometry of the solid is
Test Details
A compound is formed by elements A and B. This crystallizes in the cubic structure where the A atoms are at the corners of the cube and B atoms are at the body centres. The simplest formula of the compound is
Test Details
Na and Mg crystallize in BCC and FCC crystals respectively, then the number of atoms of Na and Mg presenting the unit cell of their respective crystal is
Test Details
A compound formed by elements A and B crystallizes in a cubic structure where A atoms are at the corners of a cube and B atoms are at the face centre. The formula of the compound is:
Test Details
An element has fcc structure having 5.0 x 1023 unit cells. The number of atoms in these unit cells will be.
Test Details
Ozazone formation involves only 2-carbon atoms of glucose because of
Test Details
In which of the following the number of carbon atoms does not remain same when carboxylic acid is obtained by oxidation?
Test Details
If isotopic distribution of C-12 and C-14 is 98% and 2% respectively then the no. of C-14 atoms in 12 gm of carbon is
Test Details
Number of atoms in 558.5 gram Fe (at. Wt. of Fe = 55.85 g mol-1) is
Test Details
How many moles of magnesium phosphate, mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
Test Details
A compound contains atoms of three elements A, B, and C. If the oxidation number of A is +2, B is +5 and that of C is -2, the possible formula of the compound is
Test Details
Atoms A are arranged in ccp array. Atoms B occupy all octahedral voids and half of the tetradhedral voids. The formula of compound AB is
Test Details
An element having bcc structure has 12.08 x 1023 unit cells. The number of atoms in these cells is
Test Details
Linear combination of two hydridised orbitals belonging to the two atoms, each having one electron leads to a
Test Details
If the mean free path of atoms is doubled then the pressure of gas will become
Test Details
The root mean square speed of the molecules of a diatomic gas is v. When the temperature is doubled, the molecules dissociate into two atoms. The new root mean square speed of the atom is &n
Test Details
If the mean free path of atoms is doubled then the pressure of gas will become
Test Details
The root mean square speed of the molecules of a diatomic gas is v. When the temperature is doubled, the molecules dissociate into two atoms. The new root mean square speed of the atom is
Test Details
Consider the spectral line resulting from the transition from n = 2 to n = 1 in atoms and ions given below. The shortest wavelength is produced by
Test Details
A atomic power reactor furnace can deliver 300 MW. The energy released due to fission of each of uranium atom U238 is 170 MeV. The number of uranium atoms fissioned per hour will be &n
Test Details
Atoms whose nuclei contain different number of protons but same number of neutrons are called
Test Details
A silicon specimen is made into a P-type semi-conductor by doping, on an average, one Indium atom per 5 x 107 silicon atoms. If the number density of atoms in the silicon specimen is 5 x 1028 atoms/m3, then the number of acceptor atom
Test Details
A Ge specimen is doped with Al. The concentration of acceptor atoms is ~1021 atoms/m3. Given that the intrinsic concentration of electron hole pairs is ~1019
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