10th Class Chemistry Chapter 9 Test09. Hydrocarbons

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. In Baeyer’s test, saturated hydrocarbons show:
   1. No reaction
   2. Colourless solution
   3. Formation of precipitate
   4. Blue colouration
2. The general formula of alkanes is:
   1. CnH2n
   2. CnH2n+2
   3. CnH2n-2
   4. CnHn
3. The general formula of alkenes is:
   1. CnH2n+2
   2. CnH2n
   3. CnH2n-2
   4. CnHn
4. Dehydration of alcohols to alkenes is carried out using:
   1. NaOH
   2. $Al_2O_3$
   3. HCl gas
   4. Zn/HCl
5. Fossil fuels are formed from:
   1. Rocks and minerals
   2. Remains of ancient organisms
   3. Volcanoes
   4. Ocean water
6. Hydrocarbons whose carbon-carbon bonds are all single are called:
   1. Saturated hydrocarbons
   2. Unsaturated hydrocarbons
   3. Aromatic hydrocarbons
   4. Cyclic hydrocarbons
7. Fractional distillation separates petroleum into fractions based on:
   1. Density
   2. Boiling point
   3. Viscosity
   4. Solubility
8. Ethyne is also called:
   1. Methane
   2. Acetylene
   3. Ethene
   4. Propene
9. Saturated hydrocarbons do not react with bromine water. The solution remains:
   1. Blue
   2. Colourless
   3. Orange-brown
   4. Pink
10. Ethyne reacts with bromine to form:
    1. Dibromoethane
    2. Tetrabromoethane
    3. Dichloroethane
    4. Tetrachloromethane