A. alum
B. nickel sulphate
C. copper sulphate
D. barium sulphate
A. reflection
B. interference
C. diffraction
D. refraction
A. Shorter wavelength
B. Larger wavelength
C. X-ray not produced
D. All are possible
A. Methane
B. Ethane
C. Hydrogen
D. Nitrogen
Covalent network crystals have_____________?
A. higher melting point then molecular crystals
B. lower melting point then molecular crystals
C. discrete molecules linked by Van der waals forces
D. hydrogen bonding
A. Electrons fill orbitals with parallel ss until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) s.
B. The electrons in the same atom cannot have the same four quantum numbers
C. There is maximum of two electrons is an orbital.
D. None
A. H2O
B. CH3OH
C. Both a and b
D. None of the above