Carbon and its Compounds MCQ Quiz

30 questions

1. The valency of carbon is

   1. 2
   2. 3
   3. 4
   4. 1

2. The self-linking property of carbon is called

   1. tetravalency
   2. catenation
   3. isomerism
   4. polymerisation

3. General formula of alkanes is

   1. CnH2n
   2. CnH2n+2
   3. CnH2n-2
   4. CnHn

4. General formula of alkenes is

   1. CnH2n+2
   2. CnH2n
   3. CnH2n-2
   4. CnH2n+1

5. The bond in carbon compounds is mostly

   1. ionic
   2. covalent
   3. metallic
   4. hydrogen

6. First member of the alkyne series is

   1. ethene
   2. ethyne
   3. methane
   4. propyne

7. Successive members of a homologous series differ by

   1. CH3
   2. CH2
   3. C2H2
   4. CH

8. Compounds with same molecular formula but different structures are

   1. isotopes
   2. isomers
   3. isobars
   4. allotropes

9. The functional group –COOH is

   1. alcohol
   2. carboxylic acid
   3. aldehyde
   4. ketone

10. The functional group –OH is

    1. ketone
    2. alcohol
    3. acid
    4. ester

11. Ethanol on oxidation with alkaline KMnO4 gives

    1. methane
    2. ethanoic acid
    3. ethene
    4. ester

12. Ester is formed by reaction of an acid with

    1. water
    2. alcohol
    3. base
    4. metal

13. The reaction of ester with a base to give alcohol and salt is

    1. esterification
    2. saponification
    3. combustion
    4. substitution

14. Cleansing action of soap is due to formation of

    1. esters
    2. micelles
    3. crystals
    4. polymers

15. Soap does not work well in

    1. soft water
    2. hard water
    3. rain water
    4. distilled water

16. In a micelle, the hydrophobic tails point

    1. outward to water
    2. inward to grease
    3. randomly
    4. to air

17. Vinegar contains about

    1. 5–8% ethanoic acid
    2. 50% ethanoic acid
    3. 90% ethanol
    4. pure acid

18. Ethanoic acid + sodium hydrogencarbonate gives

    1. H2
    2. CO2
    3. O2
    4. Cl2

19. Saturated hydrocarbons contain

    1. double bonds
    2. single bonds only
    3. triple bonds
    4. rings only

20. Unsaturated hydrocarbons undergo

    1. substitution mainly
    2. addition reactions
    3. no reaction
    4. only combustion

21. Assertion: Diamond is very hard. Reason: Each carbon is bonded to four others in a rigid 3-D network.

    1. Both true, R explains A
    2. Both true, R not explanation
    3. A true, R false
    4. A false, R true

22. Which allotrope of carbon conducts electricity?

    1. diamond
    2. graphite
    3. fullerene
    4. charcoal

23. Ethanol is used as

    1. a fuel/solvent
    2. an oxidiser
    3. a metal
    4. a base

24. Denatured alcohol is ethanol made

    1. pure
    2. unfit for drinking
    3. acidic
    4. gaseous

25. Complete combustion of a hydrocarbon gives

    1. CO + soot
    2. CO2 + H2O
    3. only carbon
    4. H2 only

26. A yellow, sooty flame indicates

    1. complete combustion
    2. incomplete combustion
    3. no combustion
    4. endothermic reaction

27. Detergents are effective in hard water because they

    1. form scum
    2. do not form insoluble salts
    3. react with soap
    4. are basic

28. The number of covalent bonds in a methane (CH4) molecule is

    1. 2
    2. 3
    3. 4
    4. 1

29. Addition of hydrogen to vegetable oils (hydrogenation) uses catalyst

    1. Pt/Pd
    2. Ni
    3. Fe
    4. Cu

30. Which is a straight-chain isomer of C4H10?

    1. isobutane
    2. n-butane
    3. cyclobutane
    4. propane

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