This set of Applied Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Graphite”.
1. Graphite has layered _________ structure.
a) Three dimensional structure
Explanation: Graphite has layered planar structure. The individual layers are called as graphene. In each layer is arranged in the honey comb lattice.
2. The distance between the planes of the graphite is _________
Explanation: The distance between the planes is 0.335nm. Atoms in the plane are bonded covalently with three of the four potential bonding sites satisfied.
3. Bonding between the layers is _________
c) Very tightly bonded
d) Not bonded
Explanation: Bonding between the layers is weak vander waals forces. The covalent bonds are present in between the atoms of the planes.
4. The graphite is _________ anisotropic.
d) Very less
Explanation: The graphite is highly anisotropic. Since the phonons propagate quickly along the tightly bound planes but are slower to travel from one place to another.
5. In oxygen containing atmospheres, the graphite readily converted into _________
Explanation: In oxygen containing atmospheres, the graphite readily converted into carbondioxide at temperatures of 700oC and above.
6. Graphite is used in the arc lamp electrode.
Explanation: Graphite is a good conductor of electricity. It conducts electricity due its large de localisation of electrons. So, Graphite is used in the arc lamp electrodes.
7. The graphite undergoes ________ corrosion in stainless steel.
a) Microbial corrosion
b) Crevice corrosion
c) Pitting corrosion
d) High temperature corrosion
Explanation: The graphite undergoes pitting corrosion in stainless steel. The creation of the small holes on the surface of the metal is called pitting corrosion.
8. The graphite is __________
Explanation: The graphite is diamagnetic. It will float in the mid air above the strong magnet. Sometimes graphite loses its lubricating properties.
9. Graphite is also called as______
a) White lead
b) Black lead
c) White coal
d) Black coal
Explanation: The graphite is also called as black lead. It has another name called as the plumbago. It is used in its massive mineral form.
10. Natural graphite is mostly used in_________
Explanation: The graphite is used mostly in refrigerators. It is also used in batteries, steel making, expanded graphite, brake linings, foundry facings and lubricants.
Sanfoundry Global Education & Learning Series – Applied Chemistry.
To practice all areas of Applied Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.