FMT Chemistry quiz 2
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#1. The general formula for alkenes is:
#2. The general formula for alkynes is:
#3. Saturated hydrocarbons contain which type of bonds between carbon atoms?
#4. The process of cracking of petroleum gives:
#5. Benzene is an example of:
#6. The chemical formula of benzene is:
#7. The functional group of aldehydes is:
#8. The functional group of ketones is:
#9. Ethyl alcohol and methyl alcohol are examples of:
#10. Fermentation of molasses yields:
#11. The process of saponification is used to produce:
#12. Proteins are polymers composed of monomer units called:
#13. Which vitamin is water soluble?
#14. Carbohydrates are polyhydroxy aldehydes or polyhydroxy:
#15. Glucose and fructose are examples of:
#16. Sucrose (table sugar) is a:
#17. Starch and cellulose are examples of:
#18. Enzymes are biological catalysts that are chemically:
#19. DNA contains which nitrogenous base that is absent in RNA?
#20. RNA contains which nitrogenous base that is absent in DNA?
#21. Which gas is responsible for global warming (greenhouse effect)?
#22. Acid rain is caused by emissions of:
#23. Ozone layer depletion is mainly caused by:
#24. Hardness of water is due to the presence of soluble salts of:
#25. Temporary hardness of water can be removed by:
#26. Heavy water has the chemical formula:
#27. The atomic number of an element represents the number of:
#28. Isotopes are atoms of the same element having different number of:
#29. Mass number of an atom is equal to the sum of:
#30. The modern periodic law is based on:
Chemistry Quiz 2: Chemical Bonding and Formulas
Explore how atoms combine to form compounds and learn the basics of chemical bonding.
Understand How Chemical Bonds Work
In this second practice article, students preparing for the Pakistan Navy FMT initial test can revise chemical bonding, valency, and common chemical formulas. These concepts explain how atoms combine and why different substances have different chemical properties.
Atoms may gain, lose, or share electrons when forming chemical bonds. Understanding these processes makes it easier to distinguish ionic compounds from covalent substances and recognise familiar formulas.
Important Concepts to Remember
1. Ionic Bond
An ionic bond forms through the attraction between oppositely charged ions. Ionic bonding commonly involves the transfer of electrons from one atom to another.
Example: Sodium chloride (NaCl).
2. Covalent Bond
A covalent bond forms when atoms share one or more pairs of electrons. Covalent bonds are common in molecules made from non-metal atoms.
Example: Water (H₂O).
3. Valency
Valency describes the combining capacity of an atom in a chemical compound. It can help you work out simple chemical formulas.
Example: In the usual introductory model, oxygen has a valency of 2 and hydrogen has a valency of 1.
Common Formulas for Revision
| Substance | Formula |
|---|---|
| Water | H₂O |
| Carbon dioxide | CO₂ |
| Sodium chloride | NaCl |
| Ammonia | NH₃ |
| Methane | CH₄ |
How to Practise for Better Understanding
Before checking the answer key, try to explain why each option is correct or incorrect. For example, ask yourself whether a compound contains ions or whether its atoms share electrons. This approach builds understanding rather than relying only on memorisation.
Keep a small revision notebook for chemical symbols, common formulas, and concepts that you find confusing. Review it before attempting another practice set.
Ready for the Next Topic?
After completing this bonding practice, move on to acids, bases, salts, and the pH scale. These topics introduce another important area of introductory chemistry.
Revision challenge: Can you name three common compounds and write their correct chemical formulas without looking at your notes?
Disclaimer: This educational article provides independent study material for practice. It is not an official Pakistan Navy FMT paper, and no question is guaranteed to appear in the actual examination.