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LET'S DO SOME IMPORTANT QUESTIONS AND BOOST YOUR PREPRATION :
1. Which one of the following statements about diamond and graphite is not correct? [NDA 2019-II]
(a) Diamond has tetrahedral structure, whereas graphite has a hexagonal planar structure.
(b) Both physical and chemical properties of diamond and graphite are different.
(c) Graphite is soft but diamond is hard.
(d) Graphite is a good conductor of electricity while diamond is not.
2. Which one of the following is termed as ‘Dry ice’? [NDA 2019-II]
(a) Ice present in ice-cream
(b) Solid water at Antarctica
(c) Solid state of carbon dioxide
(d) Solid water of ionosphere
3. Which one of the following statements is NOT correct? [NDA 2020-I]
(a) Buckminsterfullerene is an allotrope of carbon
(b) Diamond is a good conductor of electricity
(c) Graphite is a good conductor of electricity
(d) In graphite, each carbon atom is linked to three other carbon atoms
4. How many covalent bonds are present in a Chloropropane molecule having molecular formula, C3H7Cl? [NDA 2020-I]
(a) 6
(b) 8
(c) 9
(d) 10
5. Which one of the following is the largest composition in biogas? [NDA 2020-I]
(a) Carbon dioxide
(b) Methane
(c) Hydrogen
(d) Hydrogen sulphide
6. Which one of the following statements about the cleansing action of soap is not true? [NDA 2021-I]
(a) The oil and dirt get collected in the center of the micelle.
(b) Soap micelles scatter light.
(c) Soaps are ammonium salts of long chain carboxylic acids.
(d) Soap forms insoluble precipitates with the calcium and magnesium ions in hard water.
7. Hydrogenation of vegetable oils using nickel catalyst is an example of [NDA 2021-I]
(a) Substitution reaction.
(b) Elimination reaction.
(c) Addition reaction.
(d) Free-radical polymerization.
8. Which one of the following materials is not an allotrope of carbon? [NDA 2021-I]
(a) Diamond
(b) Graphene
(c) Fly ash
(d) Fullerene
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