Which of the following statements are correct ?A. Fullerences have dangling bondsB. Fullerences are cage-like moleculesC. Graphite is thermodynamically most stable allotrope of carbonD. Graphite is slippery and hard and therefore used as a dry lubricant in machines.

Which of the following statements are correct ?A. Fullerences have dan

1.	Which of the following statements are correct ?A. Fullerences have dangling bondsB. Fullerences are cage-like moleculesC. Graphite is thermodynamically most stable allotrope of carbonD. Graphite is slippery and hard and therefore used as a dry lubricant in machines.
Answer» Correct Answer - B::C Fullerence an allotrope of carbon with finite number of carbon atoms with closed cage structure has been identified. The `C_(60)` isotope is more dominants. The structure is nearly spherical, like football Sphere is formed by the combination of 20 hexgons and 12 pentagons. Graphite is theromodynamically more stable than all allotropes of carbon.

Discussion

No Comment Found

Related InterviewSolutions

An amorphous solid (X) burns in air to form a gas ( Y) which turns lime water milky. This gas decolourises aqueous solution of acidified `KMnO_(4).` Gas (Y) reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y and Z areA. `{:("X","Y","Z"),(C, CO,CO_(2)):}`B. `{:("X","Y","Z"),(S, SO_(2),SO_(3)):}`C. `{:("X","Y","Z"),(P, P_(2)O_(3),P_(2)O_(5)):}`D. `{:("X","Y","Z"),(S, SO_(3),H_(2)SO_(4)):}`
vii. The stability of dihalides of ` Si, Ge , Sn` and Pb increases steadily in the sequence :A. `PbX_(2) lt lt SnX_(2) lt lt GeX_(2) lt lt SiX_(2)`B. `GeX_(2) lt lt SiX_(2) lt lt SnX_(2) lt lt PbX_(2)`C. `SiX_(2) lt lt GeX_(2) lt lt PbX_(2) lt lt SnX_(2)`D. `SiX_(2) lt lt GeX_(2) lt lt SnX_(2) lt lt PbX_(2)`
`NO_(2)`,a red -brown poisonous gas is prepared in the laboratory by heatingA. `NaNO_(3)`B. `NH_(4)NO_(3)`C. `Pb(NO_(3))_(2)`D. `KNO_(3)`
Why has it been difficult to study the chemistry of radon?A. it is radioactive with short half lifeB. it is chemically inertC. its compound is not isolatedD. it has low boiling point
`SF_(6)` is not easily hydrolysed whereas `SF_(4)` can be. Assign reason.
Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power. A. `ClO_(4)^(-)gt IO_(4)^(-) gt BrO_(4)^(-)`B. `IO_(4)^(-) gt BrO_(4)^(-) gt ClO_(4)^(-)`C. `BrO_(4)^(-) gt IO_(4)^(-) gt ClO_(4)^(-)`D. `BrO_(4)^(-) gt ClO_(4)^(-) gt IO_(4)^(-)`
Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power. Ion `" " CiO_(4)^(-) " " IO_(4)^(-) " " BrO_(4)^(-)` Reduction `" " E^(Theta)=1.19 V " " E^(Theta)=1.65 V " " E^(Theta)=1.74` potential `E^(Theta)//V`A. `ClO_(4)^(-) gt IO_(4)^(-) gt BrO_(4)^(-)`B. `IO_(4)^(-) gt BrO_(4)^(-) gt ClO_(4)^(-)`C. `BrO_(4)^(-) gt IO_(4)^(-) gt ClO_(4)^(-)`D. `BrO_(4)^(-) gt ClO_(4)^(-)IO_(4)^(-)`
`SO_(2)+NaClO_(3) overset(H^(+))to`
Aluminium exhibits +3 oxidation state. As we move down the group, +1 oxidation state gets more stable. This is a consequence ofA. increaseing size of the atomB. inert pair effectC. electron deficient natureD. `p pi - p pi` bonding
Which of the following Lewis acids exhibits maximum acidic strength?A. `BI_(3)`B. `BBr_(3)`C. `BCl_(3)`D. `BF_(3)`

Which of the following statements are correct ?A. Fullerences have dangling bondsB. Fullerences are cage-like moleculesC. Graphite is thermodynamically most stable allotrope of carbonD. Graphite is slippery and hard and therefore used as a dry lubricant in machines.

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment