- Pb3O4
- PbO4
- PbO2
- Pb2O
- a
-
Sandur dissolves in acids.
Sandur is toxic because it contains lead.
The electronic configuration of Na is:
- 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.
What is the name of current Prime Minister of Pakistan?
- Maryam Nawaz
- Asif Ali Zardari
- Imran Khan
- Mian Muhammad Shahbaz Shareef
- d
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
