- 1s2,2s2,2p6,3s2,3p6,4s1
- 1s2,2s2,2p6,3s1
- 1s2,2s2,2p6,3s2
- 1s2,2s2,2p6,3s2,3p6,4s2
- b
-
Na is chemical formula of Sodium.
Its atomic number is 11.
It falls in Group-1 of periodic table.
Its only soluble isotope.
NTS Past Papers
All NTS Solved Current & Past Papers are included in this portion of ETEST Website.
Change the property of the system is equal to:
- Value of the property at initial state
- Value of the property at final state
- Difference of values from final state to initial state
- Sum of the values from initial state to final state
- d
The properties of the system in bulk, rather than that of the part of the system, which are easily measurable are known as:
- Intrinsic properties
- Microscopic properties
- Macroscopic properties
- Extrinsic properties
- c
Linus Pauling assumed that the atomic orbital having nearly equal energies can be combined in various ways within an atom to form ____ hybrid orbital.
- More
- Less
- Equivalent
- Different
- c
NaCl and KCL have high melting and boiling points due to their:
- Amorphous structure
- Strong inter molecular forces
- Strong inter ionic forces
- Irregular crystal structure
- c
Bohr’s assumed that on the basis of Quantum theory, there exists the possibility that electrons in certain orbits may not give out radiation and remain stable, called as:
- Stable state
- Stationary state
- Excited state
- Unstable state
- b
-
These certain orbits are known as Stationary State or Stationary Orbits.
The white light gives continuous band of colours, each single band has specific wave length known as _____ light.
- Spectrum
- Coherent
- Monochromatic
- Unichromatic
- c
Amorphous solids, which melt over a wide range of temperature, as they don’t have sharp melting point. This is because:
- They have definite pattern
- They have uniform attractive forces
- Their crystals are identical in shape
- Their inter molecular forces vary place to place
- d
Which of the following fact about liquid’s behavior is used in hydraulic brake system?
- Diffusibility
- Compressibility
- Viscosity
- Fluidity
- d
According to the Kinetic Theory of Liquids, particles of liquid are fairly randomly arranged (as in gas), but consists of ____ in which they are very close together.
- Arrays
- Groups
- Clusters
- Gangs
- c