Carbon and its Compounds MCQs multiple-choice Questions Answers
1. The main constituent of all organic matter is:
a. Oxygen
b. Carbon
c. Sulphur
d. Nitrogen
Answer: b. Carbon
2. The penultimate shell of carbon contains how many electrons?
a. 1
b. 4
c. 2
d. 7
Answer: c. 2
3. Which of the following is the most electronegative element?
a. Carbon
b. Silicon
c. Pb
d. Sn
Answer: a. Carbon
4. Which of the following tetrahalide is not hydrolyzed?
a. Silicon
b. Carbon
c. Tin
d. Lead
Answer: b. Carbon
a. Ionic carbides
b. Covalent carbides
c. Interstitial carbides
d. All are possible
Answer: d. All are possible
6. Carbides because of their hardness are:
a. Ionic carbides
b. Covalent carbides
c. Interstitial carbides
d. None of these
Answer: b. Covalent carbides
7. Who discovered and name carbon for the first time?
a. Rutherford
b. Henry
c. Antonie Levoiser
d. Merry Curie
Answer: c. Antonie Levoiser
8. How many allotropic forms are present in carbon?
a. Two
b. Three
c. Four
d. Five
Answer: c. Four
9. Which of the bonds possesses the highest bond energy?
a. C-C
b. Si-Si
c. Ge-Ge
d. Sn-Sn
Answer: a. C-C
10. Which property is not exhibited by carbon in its compounds?
a. Forming bonds to other carbon atoms
b. Forming multiple forms
c. Exhibiting allotropic forms
d. Forming compounds with coordination number beyond four
Answer: d. Forming compounds with coordination number beyond four
11. Diamond and graphite are……….forms of carbon:
a. Isotropic
b. Amorphous
c. Allotropic
d. Isomeric
Answer: c. Allotropic
12. The different layers in graphite are held together by:
a. Ionic bonding
b. Metallic bonding
c. Van der Waals forces
d. Dipole-dipole forces
Answer: c. Van der Waals forces
13. What do lead pencils contain:
a. Lead
b. Graphene
c. A mixture of lead and silica
d. Graphite
Answer: d. Graphite
14. What is called dry ice?
a. Solid CO2
b. Solid ammonia
c. Solid carbon
d. Solid sulphur dioxide
Answer: a. Solid CO2
15. Which of the following compounds combine with hemoglobin?
a. Carbon dioxide
b. Carbon monoxide
c. Nitric oxide
d. Nitrogen
Answer: b. Carbon monoxide
16. The organic compounds that are present in all living things are:
a. Carbohydrates
b. Lipids and nucleic acid
c. Proteins
d. All of these
Answer: d. All of these
17. By mass, what is the total percentage of carbon present in the human body?
a. 9.5 %
b. 18.5 %
c. 3.3 %
d. 65 %
Answer: b. 18.5 %
18. Choose the correct statement about carbon?
a. All living things contain carbon
b. Carbon is the main component of carbohydrates.
c. Carbon is the building block of life
d. All of these
Answer: d. All of these
19. In the atmosphere, carbon exists primarily in the form of:
a. Carbon dioxide (CO2)
b. Carbon monoxide (CO)
c. Both CO2 and CO
d. All of these
Answer: a. Carbon dioxide (CO2)
20. How much carbon dioxide is in the atmosphere?
a. 10 %
b. 0.5 %
c. 0.04 %
d. 7.04 %
Answer: c. 0.04 %
21. Which of the following factors contributes to the carbon cycle?
a. Burning fossil fuels
b. Respiration
c. Using limestone to make concrete
d. All of these
Answer: d. All of these
22. Which of the following will undergo addition reaction?
a. C2H4
b. C2H6
c. C3H8
d. CH4
Answer: a. C2H4
23. Ethyl alcohol on oxidation with K2Cr2O7 gives………:
a. Acetic acid
b. Ethanol
c. Formic acid
d. Acetaldehyde
Answer: a. Acetic acid
24. Which of the following is NOT a carbon compound?
a. Chalk
b. Wood
c. Paper
d. All of these
Answer: a. Chalk
25. Identify ‘X’ in the following reaction: CH3COOH + Na2CO3 → ‘X’ + CO2 + H2O
a. CH2(Na)COOH
b. CH3COONa
c. NaOH
d. NaHCO3
Answer: b. CH3COONa
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