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InOrganic Chemistry -- Carbon
6.
Which of the following statements is incorrect for graphite?
- A.Its density is lower than that of diamond.
- B.It has a layered structure and the bonding between the layers is very weak.
- C.Its layers are very tightly packed, almost without any space between them
- D.It cleaves easily between the layers which accounts for the remarkable softness of the crystals.
- Answer
- Report
Answer : [C]
7.
Which of the following statements is correct?
- A.Graphite is thermodynamically more stable than diamond
- B.Diamond is thermodynamically more stable than graphite
- C.Graphite has such a high thermodynamical stability that diamond spontaneously changes into graphite in ordinary conditions
- D.Graphite and diamond have equal thermodynamic stability.
- Answer
- Report
Answer : [A]
8.
Among the following, the tendency for catenation decreases in the order
- A.C > Si > Ge = Sn > Pb
- B.Si > C > Ge = Sn > Pb
- C.C > Ge > Sn > Si > Pb
- D.C > Pb > Sn > Ge > Si
- Answer
- Report
Answer : [A]
9.
In the equilibrium C(s, diamond)⇌ C(s, graphite) + heat (density of diamond and graphite are 3.5 and 2.3 g/cm3 respectively), the
equilibrium will be shifted to the left at
- A.low temperature and very high pressure
- B.high temperature and low pressure
- C.high temperature and very high pressure
- D.low temperature and low pressure
- Answer
- Report
Answer : [C]
10.
In the carbon family the melting points of the elements decrease on
descending the group because the interatomic bonds become
- A.stronger as the size of the atom increases
- B.weaker as the size of the atom decreases
- C.stronger as the size of the atom decreases
- D.weaker as the size of the atom increases
- Answer
- Report
Answer : [D]
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