SureDen
Properties of Hydrogen that Resemble Alkali Metals:
Electronic configuration
Hydrogen atom has one electron in its vale
Ortho and Para hydrogen:
A molecule of dihydrogen contains two atoms, in which the nuclei of both the atoms are spinning. Depending upon the direct
Water:
Structure of water:
In the Earth's biosphere, water is essential to all forms of lifeAbout 75% of the Eart
Heavy water:
Preparation of heavy water
Heavy water is prepared either by prolonged electrolysis or by fractional disti
Evidences in Favors of Bohr model
Stability of an atom – According to Bohr electron revolving around the nucleu
Physical properties of aliphatic aldehydes and ketones
Aldehydes and ketones are simple compounds which contain acarbonyl group - a carbon-oxygen d
Isotopic forms of hydrogen:
Hydrogen is the most abundant element in the universe. About half the mass of sun and stars is due to hydrogen. Jupiter
Types of Oxides:
Oxides are binary compounds of oxygen with another element, e.g., CO2, SO2, CaO, CO, ZnO, BaO2, H
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
Construction and working of S.H.E or N.H.E
On S.H.E both oxidation as well as reduction can takes place
When S.H.E act as Anode, then
Position of hydrogen in periodic table:
Hydrogen is the first element of the periodic table. Its atomic number is 1, which indicates the presence o
Crystalline Solids:
Amorphous solids are very useful but most of the solids are crystalline in nature due to thermodynamically favorable conditions
Chemical properties of aliphatic aldehydes and ketones
ADDITION REACTIONS
Aldehydes and ketones are reduced to the corr
Chemical properties of Alkene
Alkenes are more reactive than alkanes due to the presence of a double bond. The carbon-carbon double bond consists o
Solvent property of water:
The polarity of water: Water has a simple molecular structure. It is composed of one oxygen atom and
Alkynes contain a triple bond (≡). A triple bond has one and two bonds.
Some characteristic reactions of alkynes are,
Combustion
Introduction of oxidation and reduction
Oxidation:"Oxidation is a reaction in which oxygen is added or hydroge
Postulates of Bohr’s theory of hydrogen atom:
This model also called planetary model of the atom is based on the following postulates:
Physical properties of aliphatic amines
i) Physical state and smell
Lower members of aliphatic amines are gases while h
Preparation of haloalkanes Part 1
Preparation of haloalkanes:
Haloalkanes can be produced from virtually all organic precursors. From the perspective of industry, the most important ones are alkanes and alkenes.
From A
Preparation of monohydric alcohols
1.From aldehyde and ketones
Aldehydes and ketones are reduced to the corresponding alcohols by
Proton was discovered by E. GoldStein. He using a perforated cathode , when high voltage is passed though a gas under reduced pressure then source rays travel in the opp
Balancing of REDOX REACTION
Two types of Balancing of REDOX REACTION:
There are two very important met
GENERAL CHARACTERSTICS OF ETHERS :
PHYSICAL PROPERTIES :
Physical properties of ether
Chemical properties of Alkanes
Alkanes are quite inert substances with highly stable nature. Their inactiveness has been explained as:
(
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
Physical properties of aromatic amines
Hydrogen bonding significantly influences the properties of primary and secondary amines. Thus the boiling p
Nitrogen forms the oxo acids such as H2N2O2 (hyponitrous acid), HNO2 (Nitrous acid) and HNO3 (Nitric Acid) with their st
Aliphatic hydrocarbon form coal
The petrol obtained artificially from coal as a mixture of alkanes resembling petroleum like aliphatic hydrocarbon
General methods of preparation of alkanes
(i) Decarboxylation :
(a) Decarboxylation means removal of CO2 fro
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The maximum number of hydrogen bonds a water molecule can form is
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The pressure of a 1:4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. What would be the partial pressure of dioxygen?
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An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The coulomb force F between the nucleus and the electron
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In the Bohr’s model of hydrogen atom, the electrons moves around the nucleus in a circular orbit of a radius 5 * 10–11 metre. It’s time period is 1.5 ´ 10–16 sec. The current associated is
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4.5 g of aluminium (at. mass 27 u) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be
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A metal oxide has the formula Z2O3. It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is &nbs
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In Haber process 30 L of dihydrogen and 30 L of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end? [2003]
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10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be [2009]
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The hydrogen phosphate of certain metal has formula MHPO4.The formula of metal chloride would be
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Which of the following statements do not form a part of Bohr’s model of hydrogen atom?
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The pair of molecules having strongest intermole-cular hydrogen bonds is:
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The maximum possible number of hydrogen bonds a water molecule can form is:
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A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is
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A standard hydrogen electrode has zero electrode potential because
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Which of the following statements do not form a part of Bohr’s model of hydrogen atom?
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5 mole of hydrogen gas is heated from 30°C to 60°C at constant pressure. Heat given to the gas is (given R = 2 cal/mole degree)
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5 mole of hydrogen gas is heated from 30°C to 60°C at constant pressure. Heat given to the gas is (given R = 2 cal/mole degree)
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Hydrogen gas is filled in a balloon at 20°C. If temperature is made 40°C, pressure remaining same, what fraction of hydrogen will come out
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If the value of molar gas constant is 8.3 J/mole-K, the n specific gas constant for hydrogen in J/mole-K will be
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A cylinder of capacity 20 litres is filled with H2 gas. The total average kinetic energy of translatory motion of its molecules is 1.5 x 105 J. The pressure of hydrogen in the cylinder is &nb
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The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at 0°C is 3180 m/s. The pressure on the hydrogen gas is (Density of hydrogen gas is 8.99 x 10-2 kg/m3, 1 atmosphere=1.01 x 105 N/m2)
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At what temperature is the root mean square velocity of gaseous hydrogen molecules is equal to that of oxygen molecules at 47°C
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The root mean square speed of hydrogen molecules at 300 K is 1930 m/s. Then the root mean square speed of oxygen molecules at 900 K will be
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If the value of molar gas constant is 8.3 J/mole-K, the n specific gas constant for hydrogen in J/mole-K will be
Test Details
The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at 0°C is 3180 m/s. The pressure on the hydrogen gas is
(Density of hydrogen gas is 8.99 x 10-2 kg/m3, 1 atmosphere=1.01 x 105 N/m
Test Details
Hydrogen gas is filled in a balloon at 20°C. If temperature is made 40°C, pressure remaining same, what fraction of hydrogen will come out
Test Details
A cylinder of capacity 20 litres is filled with H2 gas. The total average kinetic energy of translatory motion of its molecules is 1.5 x 105 J. The pressure of hydrogen in the cylinder is
Test Details
At what temperature is the root mean square velocity of gaseous hydrogen molecules is equal to that of oxygen molecules at 47°C
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The root mean square speed of hydrogen molecules at 300 K is 1930 m/s. Then the root mean square speed of oxygen molecules at 900 K will be
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The decomposition of hydrogen peroxide can be slowed by the addition of a small amount of acetamide. The latter acts as a
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The decomposition of hydrogen peroxide can be slowed by the addition of a small amount of acetamide. The latter acts as a
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The ratio of areas within the electron orbits for the first excited state to the ground state for hydrogen atom is
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Energy of the electron in nth orbit of hydrogen atom is given by En=−13.6n2e
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Energy E of a hydrogen atom with principal quantum number n is given by E=−13.6n2eV
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When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: h=6.6×
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In hydrogen atom, if the difference in the energy of the electron in n = 2 and n = 3 orbits is E, the ionization energy of hydrogen atom is
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The absorption transition between two energy states of hydrogen atom are 3. The emission transitions between these states will be
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Hydrogen atom emits blue light when it changes from n = 4 energy level to n = 2 level. Which colour of light would the atom emit when it changes from n = 5 level to n = 2 level
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The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
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Hydrogen atom in its ground state is excited by radiation of wavelength 975 Å. How many lines will be there in the emission spectrum
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The wave number of the energy emitted when electron comes from fourth orbit to second orbit in hydrogen is 20,397 cm–1. The wave number of the energy for the same transition in He+
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The ratio of areas within the electron orbits for the first excited state to the ground state for hydrogen atom is
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Energy of the electron in nth orbit of hydrogen atom is given by En=−13.6n2e
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Energy E of a hydrogen atom with principal quantum number n is given by E=−13.6n2eV
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When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: h=6.6×
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In hydrogen atom, if the difference in the energy of the electron in n = 2 and n = 3 orbits is E, the ionization energy of hydrogen atom is
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The absorption transition between two energy states of hydrogen atom are 3. The emission transitions between these states will be
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Hydrogen atom emits blue light when it changes from n = 4 energy level to n = 2 level. Which colour of light would the atom emit when it changes from n = 5 level to n = 2 level
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The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
Test Details
Hydrogen atom in its ground state is excited by radiation of wavelength 975 Å. How many lines will be there in the emission spectrum
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The wave number of the energy emitted when electron comes from fourth orbit to second orbit in hydrogen is 20,397 cm–1. The wave number of the energy for the same transition in He+
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The de-Broglie wavelength associated with a hydrogen atom moving with a thermal velocity of 3 km/s will be
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The innermost orbit of the hydrogen atom has a diameter 1.06 Å. The diameter of tenth orbit is
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The energy of hydrogen atom in nth orbit is En, then the energy in nth orbit of singly ionised helium atom will be
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The wavelength of radiation emitted is λ0 when an electron jumps from the third to the second orbit of hydrogen atom. For the electron jump from the fourth to the second orbit of the hydrogen atom,
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In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbits is
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A photon of energy 12.4 eV is completely absorbed by a hydrogen atom initially in the ground state so that it is excited. The quantum number of the excited state is
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If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li++ is &nbs
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A double charged lithium atom is equivalent to hydrogen whose atomic number is 3. The wavelength of required radiation for emitting electron from first to third Bohr orbit in Li++
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Ionisation energy for hydrogen atom in the ground state is E. What is the ionisation energy of Li++ atom in the 2nd excited state
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If r is the radius of the lowest orbit of Bohr’s model of hydrogen atom, the radius of next higher energy orbit is
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The hydrogen atom can give spectral lines in the series, Lyman, Balmer and Paschen. Which of the following statements is correct
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If radiations of all wavelengths from ultraviolet to infrared are passed through hydrogen gas at room temperature, absorption lines will be observed in
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The ionisation potential of hydrogen is 13.6eV. Then the energy released when an electron jumps from n = 3 to n = 2 orbit, is
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The electron in a hydrogen atom makes a transition from an excited state to ground state. Which of the following statements is true
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1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is
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