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
Submitted by :- Jamil Ahmed
All of the following substances are crystalline except_____________?
A. Ice
B. Diamond
C. Sucrose
D. Plastic
Submitted by :- Jamil Ahmed
Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________?
A. ionic substances
B. metallic substances
C. molecular solids
D. covalent network solids
Submitted by :- Jamil Ahmed
Which of the following is a substance?
A. Sea water
B. Brass
C. Tape water
D. Graphite
E. Sand
Submitted by :- Jamil Ahmed
Sodium carbonate is produced by____________?
A. Haber process
B. Ammonia Solvay process
C. Decons process
D. Lead chamber process
Submitted by :- Jamil Ahmed
Electron was discovered by?
A. Michael Faraday
B. James Maxwell
C. Yuri Gagarin
D. J.J Thomson
Submitted by :- Jamil Ahmed
The radioactive isotope of hydrogen is called___________?
A. tritium
B. deuterium
C. protium
D. ortho-hydrogen
Submitted by :- Jamil Ahmed
The soul of chemistry is dealing with___________?
A. Internal structural changes in matter
B. Composition of matter
C. Properties of matter
D. Composition and properties of matter
Submitted by :- Jamil Ahmed
Which one of the following has the maximum number of isotopes ?
A. oxygen
B. carbon
C. tin
D. chlorine
Submitted by :- Jamil Ahmed
Which of the following terms is not used for ionic compound ?
A. formula unit
B. empirical formula
C. molecular formula
D. formula mass
Submitted by :- Jamil Ahmed