A
Uranium
B
Thorium
C
Nobelium
D
Moylbednum
Nobelium is a synthetic chemical element with the symbol No and atomic number 102. It is named in honor of Alfred Nobel, the inventor of dynamite and benefactor of science. A radioactive metal, it is the tenth transuranic element and is the penultimate member of the actinide series.
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A
Lyman
B
Paschen
C
Brackett
D
Balmer
Lyman series of hydrogen atom lies in ultraviolet region, Balmer series lies in visible region while Pfund and Paschen series lie in infrared region.
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A
Potential energy decreases, kinetic energy increases
B
Potential energy increases, kinetic energy decreases
C
Both potential energy and kinetic energy decreases
D
Absorption spectrum
when a hydrogen atom is raised from ground state to excited state, its potential energy increases whereas kinetic energy decreases.
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Wrong Answered :
A
11 neutrons and 12 protons
B
12 protons and 11 electrons
C
11 electrons and 12 neutrons
D
12 electrons and 11 neutrons
The atomic number of sodium is 11 that means the number of protons in sodium is 11 and also the number of electrons in sodium is 11 . And the mass number of sodium is 23 that means the total number of protons and neutrons in sodium is 23 . That is, the number of neutrons in the sodium is 12 .
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A
Aluminium and Tin
B
Copper and Silver
C
Iron , Silver and Tin
D
Copper, Zinc and Nickel
German Silver is an alloy of copper, zinc and nickel, sometimes also containing lead and tin. It was originally named for its silver white colour, but the term silver is now prohibited for alloys not containing that metal
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Wrong Answered :
A
Calcium - Ca
B
Aluminium - Al
C
Sodium - So
D
Chlorine - Cl
Sodium - Na
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A
8,2,1
B
2,1,8
C
2,8,1
D
1,8,2
In this notation, the electronic configuration of sodium would be distributed in the orbitals as 2-8-1.
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Wrong Answered :
A
Argon
B
Helium
C
Radon
D
Neon
Helium has two electrons. Its electronic configuration is 1s2. So it does not have complete octet.
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A
electrons
B
protons
C
neutrons
D
nucleons
Isotone, any of two or more species of atoms or nuclei that have the same number of neutrons. Thus, chlorine-37 and potassium-39 are isotones, because the nucleus of this species of chlorine consists of 17 protons and 20 neutrons, whereas the nucleus of this species of potassium contains 19 protons and 20 neutrons
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A
Linear structure
B
tetrahedral structure
C
trigonal planer structure
D
hexagonal multilayer structure
Since graphite is a crystalline solid it can be defined by a basic unit cell. Graphite is hexagonal and therefore is defined by a hexagonal unit cell. ... Since each unit cell contains “centered” and “edge” carbon atoms the unit cell is considered a “centered” unit cell as opposed to a primitive unit cell.
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Wrong Answered :
A
Liquified Petroleum Gas
B
Hydrogen
C
Methane
D
Compressed Natural Gas
Calorific value is nothing but the energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram. Hence, hydrogen has the highest calorific value.
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Wrong Answered :
A
Neutrons
B
Positrons
C
Protons
D
Electrons
Isotone, any of two or more species of atoms or nuclei that have the same number of neutrons. Thus, chlorine-37 and potassium-39 are isotones, because the nucleus of this species of chlorine consists of 17 protons and 20 neutrons, whereas the nucleus of this species of potassium contains 19 protons and 20 neutrons.
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Wrong Answered :
A
Phosphorous
B
Bromine
C
Chlorine
D
Helium
Mercury exists as liquid at room temperature, but bromine is a non metal which is liquid at room temperature.
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