After understanding the assertion and reason, choose the correct option.
Assertion : In the bonding molecular orbital (MO) of `H_(2)`, electron density is increased between the nuclei.
Reason : The bonding MO is `Psi_(A)+Psi_(B)`, which shows destructive interference of the combining electron waves.
After understanding the assertion and reason, choose the correct option.
Assertion : In the bonding molecular orbital (MO) of `H_(2)`, electron density is increased between the nuclei.
Reason : The bonding MO is `Psi_(A)+Psi_(B)`, which shows destructive interference of the combining electron waves.
Assertion : In the bonding molecular orbital (MO) of `H_(2)`, electron density is increased between the nuclei.
Reason : The bonding MO is `Psi_(A)+Psi_(B)`, which shows destructive interference of the combining electron waves.
A
Assertion and Reason are correct, but Reason is not the correct explanation for the Assertion
B
Assertion and Reason are correct and Reason in the correct explanation for the Assertion.
C
Assertion is incorrect, Reason is correct.
D
Assertion is correct, Reason is incorrect.
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The correct Answer is:
D
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In a bonding molecular orbital, the electron density is almost zero between the nuclei of the combining atoms.
Assertion : In the formation of a molecule , only the outer shell electrons take part in chemical combination and they are known as valence electrons. Reason : Atoms achieve the stable octet when they are linked by chemical bonds .
Assertion: Real gases behave as ideal gases most closely at low pressure and high temperature. Reason: Intermolecular force between ideal gas molecules is assumed to be zero. Choose the appropriate option: a) If both Assertion and Reason are true and the reason is correct explanation of the Assertion. b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion. c) If Assertion is true, but the Reason is false. d) If Assertion is false but the Reason is true.
Assertion : H_(2) molecule is more stable than He-H molecule . Reason : The antibonding electron in He-H molecule decreases the bond order thereby the stability.
The molecular orbital with the lowest eenrgy is filled first. Thus sigma (1s) is filled first where as 'sigma^(*)(2p) isfilled in thelast, also the maximum number of electron in bonding and antibonding molecular orbitals are according to Pauli and Hund's rule. As an electron in an antibonding molecular orbital cancels out the stability introduced by the electron in a bonding molecular orbital, it means that in order for bonding of atoms to occur there should be an excess of bonding electron sover antibonding electrons. In case where the number of bonding and antibonding electrons are equal, no bond will be formed between the atoms. With the help of above discussion, we can define easily bond order, relative bond length, relative stability and magnetic properties for a molecule. According to MOT which statement is correct about Boron molecule ?
These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five reponses (a) If both Assertion and Reason arecorrect and Reason is the correct explanation of Asserrtion. (b) If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (c ) If Assertion is true but Reason is false. (d) If Assertion is false but Reason is true. Assertion. Velocity of a block changes from (2hati+3hatj) ms^(-1) to (-4hati-6hatj) ms^(-1) . Then, work done by all the forces during this interval of time is positive. Reason Speed of block is increasing.
These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five reponses (a) If both Assertion and Reason arecorrect and Reason is the correct explanation of Asserrtion. (b) If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (c ) If Assertion is true but Reason is false. (d) If Assertion is false but Reason is true. Assertion A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a certain distance. The surface is now tilted to an angle of 30^(@) with the horizontal and the same block is made to go up on the surface with the same initial velocity v. The decrease in the mechanical energy in the second situation is smaller than that in the first situation. Reason The coefficient of friction between the block and the surface decreases with the increase in the anglle of inclination.
Comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each, period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthonoids and actinoids are placed at the bottom of the main body of the periodic table (iv) The electronic configuration of the element which is just above the element with atomic number 43 in th same group is ...........
Comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each, period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthonoids and actinoids are placed at the bottom of the main body of the periodic table (ii) The last element of the p-block in 6th period is represented by the outermost electronic configuration.
Molecular orbital (MOT) the atoms in a molecule are supposed to loose their individual control over the electrons . The nuclei of the bonded atoms are considered to be present at equilibrium in inter-nuclear positions . The orbitals where the probability of finding electrons is maximum are called molecular orbitals extending over 2 or more nuclei when a pair of atomic orbitals combine and give rise to a pair of molecular MO's in internuclear region but decreased for antibonding MO's . Shielding of the nuclei by-increased electron density in bonding MO's reduces inter nuclear repulsion & thus stabilizes the molecule whereas lower electron density in antibonding MO's increases the repulsion and destabilises the system . Which of the following is the correct order of bond strength of given species ?
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