Question

True or False

1. A mole of CO2 has the same mass as a mole of SO2

2. When atoms form a covalent bond energy is released..

3. Alkane molecules can react together to form polymers.

4. C3H8 is a saturated compound.

5. Hydrogen can be added to alkenes to form alkanes.

6. There is more than one compound with the formula C5H12

7. Water with Ca2+ and /or Mg+ ions is known as hard water.

8. Carbon atoms can form only single covalent bonds.

9. All metals need the same amount of heat to raise their temperature by a degree Celsius.

10. Water molecules are polar

Answer 1

1: False

Molar mass of CO₂ is 44 g/mol and the molar mass of SO₂ is 64 g/mol.

2: True

Bond making is exothermic and bond breaking is a endothemic process.

3: False

Polymers are formed from unsaturated hydrocarbons but not saturated hydrocarbons (alkanes).

4: True

The general formula for saturated hydrocarbons is C_nH_2n+2. Here, n is the number of carbon atoms.

5: True

Hydrogenation of unsaturated hydrocarbons (alkanes and alkynes) gives saturated hydrocarbons (alkanes).

6: True

Isomers are the compounds having same molecular formula but different structures.

7: True

Hardness of water due to the presence of Ca²⁺ and Mg²⁺ ions.

8: False

In unsaturated hydrocarbons (alkene and alkynes) carbon can form double and triple bonds.

9: False

10: True