10th class chemistry unit 3 MCQs
chapter 3 MCQs 10th Class Chemistry
Organic Chemistry:
1. Who prepared the first organic compound urea?
a. Dalton
b. Wohler
c. Jabir bin Hayan
d. Arrhenius
2. The branch of chemistry which deals with hydrocarbons and their derivatives is called:
a. Physical chemistry
b. Inorganic chemistry
c. Analytical chemistry
d. Organic chemistry
3. The bond energy of C – C bond is:
a. 455 kJmol-1
b. 255kJmol-1
c. 555 kJmol-1
d. 355 kJmol-1
4. Carbon is:
a. Metalloid
b. A metal
c. Compound
d. A non-metal
5. The example of heterocyclic compound is:
a. Cyclohexane
b. Benzene
c. Pyridine
d. Hexane
6. The chemical formula of urea is:
a. NH2CONH2
b. NH4CNO
c. NH4Cl
d. NH4CN
7. Percentage of methane present in natural gas is:
a. 85%
b. 75%
c. 90%
d. 80%
8. The amount of carbon in peat is:
a. 85%
b. 60%
c. 90%
d. 70%
9. The percentage amount of carbon in wood is:
a. 60%
b. 40%
c. 70%
d. 52%
10. The amount of carbon in lignite is:
a. 85%
b. 60%
c. 90%
d. 70%
11. The formula of ethane is:
a. C2H4
b. CH4
c. C4H4
d. C2H6
12. The molecular formula of butane is:
a. C4H12
b. C4H8
c. C6H6
d. C4H10
13. General formula of alkanes is:
a. CnH2n-2
b. CnH2n
c. CnH2n+2
d. CnH2n+1
14. The formula of decane is:
a. C10H8
b. C10H10
c. C10H16
d. C10H22
15. The hydrogen atoms in pentane are:
a. 14
b. 10
c. 16
d. 12
16. The other name of alkanes is:
a. Paraffins
b. Halogens
c. Ethylene
d. Olefins
17. Organic compounds containing − OH group are called:
a. Ketones
b. Alcohols
c. Carboxylic acids
d. Aldehydes
18. Which of the following compounds is aldehyde?
a. CH3CHO
b. OH−CH2−CH3
c. CH3COCH3
d. COOH−CH3
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