10th class chemistry unit 4 MCQs
chapter 4 MCQs 10th Class Chemistry
Hydrocarbons:
1. General formula of saturated hydrocarbons is:
a. CnH2n
b. CnH2n-2
c. CnHn
d. CnH2n+2
2. Which of the following is saturated hydrocarbon?
a. Ethyne
b. Methane
c. Propyne
d. Propane
3. The formula of pentane is:
a. C5H8
b. C5H12
c. C5H14
d. C5H10
4. The number of hydrogen atoms in pentane is:
a. 14
b. 10
c. 16
d. 12
5. The chemical formula of chloroform is:
a. CCl4
b. CH3Cl
c. CHCl3
d. CH2Cl2
6. Which of the following is called paraffins?
a. Alkynes
b. Alkanes
c. Alkyls
d. Alkenes
7. The main source of alkanes is:
a. Coal gas mand water gas
b. Petroleum and natural gas
c. Air and water gas
d. None of the above
8. Marsh gas consists of:
a. Propane
b. Methane
c. Butane
d. Ethane
9. Which reactions are the characteristic properties of alkenes?
a. Reduction reaction
b. Substitution reaction
c. Addition reaction
d. Oxidation reaction
10. Alkenes are also called:
a. Acetylenes
b. Paraffins
c. Aeromatic compounds
d. Olefins
11. General formula of alkenes is:
a. CnH2n+2
b. CnH2n-2
c. CnH2n-1
d. CnH2n
12. Alkenes are known by the name:
a. Olefins
b. Methane
c. Acetylenes
d. Paraffins
13. Benzene is formed by the polymerization of:
a. Ethene
b. Methane
c. Butene
d. Acetylene
14. The final product of the oxidation of acetylene is:
a. Glyoxal
b. Oxalic acid
c. Glycol
d. None of the above
15. The catalyst used in the hydrogenation of ethene is:
a. Ni
b. Cu
c. Ag
d. Mg
16. Ripening of bananas produces gas:
a. Ethene
b. Methane
c. Nitrogen
d. Ethane
17. Dehalogenation of tetra halides is carried in the presence of:
a. Na
b. K
c. Zinc dust
d. Mg
18. Alkynes are called:
a. Paraffins
b. Olefins
c. Acetylene
d. Ethene
19. Which one of following hydrocarbon gas reacts with acidic solution of KMnO4 to neutralize its pink colour?
a. C2H6
b. CH4
c. C3H8
d. C2H4
20. Dehydrohalogenation of vicinal dihalides takes place in the presence of:
a. Aqueous KOH
b. Aqueous NaOH
c. Alcoholic NaOH
d. Alcoholic KOH
21. Ethyne is oxidized by the KMnO and ……… hydroxyl groups add to triple bond:
a. Four
b. Two
c. Five
d. Three
22. The percentage quantity of acetylene in coal gas is:
a. 0.08%
b. 0.06%
c. 0.09%
d. 0.7%
23. The molecular formula of acetylene is:
a. C2H2
b. C2H6
c. C2H5
d. C2H4
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