Structure of Atom
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Keep it short & simple. Type complete word. Avoid abusive language.
Select the correct statements from the following:
A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is 9.10939 × 10?³¹ kg.
C. All the isotopes of a given element show same chemical properties.
D. Protons and electrons are collectively known as nucleons.
E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.
Choose the correct answer from the options given below:
Select the correct statements from the following:
A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is 9.10939 × 10?³¹ kg.
C. All the isotopes of a given element show same chemical properties.
D. Protons and electrons are collectively known as nucleons.
E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.
Choose the correct answer from the options given below:
An Atom has three fundamental particles-electron, proton and neutron. The mass of the electron is 9.10939 × 10? ³¹ kg. Neutrons and protons, both are collectively known as nucleons. All the isotopes of a given element show same chemical properties. Dalton's atomic theory, regarded atom as an ultimat
Upvote 
For irreversible expansion of an ideal gas under isothermal condition, the correct option is:
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For irreversible expansion of an ideal gas under isothermal condition, the correct option is:
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For irreversible expansion of an ideal gas under isothermal condition
ΔU = 0, ΔS (Total) ≠ 0
Upvote The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cell is:
The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cell is:
The number of Body centred unit cells in all 14 types of Bravais lattice unit cells is 3.
Upvote If radius of second Bohr orbit of the He?ion is 105.8pm, what is the radius of third Bohr orbit of Li2+ ion?
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If radius of second Bohr orbit of the He?ion is 105.8pm, what is the radius of third Bohr orbit of Li2+ ion?
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105.8 × (2/4) = 52.9 pm ⇒ rLi+ + rX- = 52.9 × (3²/3) = 158.7 pm
Upvote Identify the incorrect statement from the following.
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Identify the incorrect statement from the following.
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Shapes of d? ²? ² and d? ² are not similar to each other.
Upvote The number of orbitals with n=5, m? = +2 is __________
The number of orbitals with n=5, m? = +2 is __________
Given below are two statements:
Statement I: Bohr's theory accounts for the stability and line spectrum of Li²? ion.
Statement II: Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Given below are two statements:
Statement I: Bohr's theory accounts for the stability and line spectrum of Li²? ion.
Statement II: Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Bohr's theory accounts for the line spectrum of single electron species but Li? has two electrons. Bohr's theory fails to explain splitting of spectral lines in presence of magnetic field i.e. Zeeman effect.
Upvote Complete combustion of 3 g of ethane gives x×10²² molecules of water. The value of x is _____. (Round off to the nearest integer).
[ Use : NA = 6.023 ×10²³; Atomic masses in u: C:12.0,O:16.0; H:1.0]
Complete combustion of 3 g of ethane gives x×10²² molecules of water. The value of x is _____. (Round off to the nearest integer).
[ Use : NA = 6.023 ×10²³; Atomic masses in u: C:12.0,O:16.0; H:1.0]
Combustion of ethane: C? H? + 7/2 O? → 2CO? + 3H? O.
Moles of C? H? = 3g / 30 g/mol = 0.1 mol.
Moles of H? O produced = 0.3 mol.
Number of H? O molecules = 0.3 × 6.023 × 10²³ ≈ 18.06 × 10²².
So, x = 18.
Upvote A certain orbital has no angular nodes and two radial nodes. The orbital is:
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A certain orbital has no angular nodes and two radial nodes. The orbital is:
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Quantum Numbers and Orbitals:
o Total Node = n - 1 (l => Azimuthal Q.N)
o Radial Node = n - l - 1
o Angular Node: l
o If Angular node = 0, then l = 0, i.e., S orbital.
o If Radial nodes = 2, then n - l - 1 = 2.
o Substituting l = 0 gi
Upvote Match List - I with List - II:
List - I (Class of Drug)
(a) Antacid
(b) Artificial Sweetener
(c) Antifertility
(d) Tranquilizers
List - II (Example)
(i) Novestrol
(ii) Cimetidine
(iii) Valium
(iv) Alitame
Choose the most appropriate match.
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Match List - I with List - II:
List - I (Class of Drug)
(a) Antacid
(b) Artificial Sweetener
(c) Antifertility
(d) Tranquilizers
List - II (Example)
(i) Novestrol
(ii) Cimetidine
(iii) Valium
(iv) Alitame
Choose the most appropriate match.
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Matching Compounds to their Class:
o Antacid: Cimetidine
o Artificial Sweetener: Alitame
o Antifertility: Novestrol
o Tranquilizers: Valium
Upvote