Most Important Questions

Questions # 12

• Briefly describe its principle, purpose and procedure.
• Define electroplating.
• What are non-electrolytes, give example?
• How electroplating of tin on steel carried out?
• How electroplating of zinc is carried out?
• In electroplating of chromium, which salt is used as an electrolyte?
• Which solution is used as electrolyte in Nelson’s cell?
• Differentiate between strong and weak electrolytes.

Questions # 13

• Define Galvanic cell.
• What is salt bridge?
• How the half cells of galvanic cell are connected?
• What is the difference between anode and cathode?
• What happens to cathode in the galvanic cell?
• What is the function of salt bridge?
• Write two differences between electrolytic and galvanic cell.

Questions # 14

• What do you mean by groups and periods in the periodic table?
• What do you mean by periodic function?
• What are the Defects in Long Form of Periodic Table?
• Define electron affinity.
• Explain the trend of electron affinity in periodic table.
• Describe its trend in periodic table.
• What do you mean by shielding effect?
• Discuss the important features of modern periodic table.
• Explain its trends in periodic table.
• Describe its trend in the periodic table.
• What is the difference between Mendeleev’s periodic law and modern periodic law?
• What are Halogens? Describe the position of halogen in periodic table?

Questions # 15

• Explain the term oxidation on the basis, of electrons concept with an example.
• Define valiancy.
• Describe oxidation and reduction in term of loss or gain of electron.
• What is the oxidation number Carbon in Na2CO3?
• Calculate oxidation number of nitrogen in HNO3.
• What is reduction?
• Explain with an example. Describe the rules for assigning the oxidation state.
• Oxidation and reduction proceed simultaneously.
• What is difference between valiancy and oxidation state?
• Explain the term oxidation on the basis of electronic concept with an example.

Questions # 16

• Write down general electronic configuration of carbon family.
• Write down the electronic configuration of chloride ion.
• Write down the electronic configuration of Na.
• Write down electronic configuration of chlorine.
• Write down the electronic configuration of Be and Ne.

Questions # 17

• What is the maximum capacity of a shell?
• Differentiate between shell and subshell.

Questions # 18

• A solution contains 50 g of sugar dissolved in 450 g of water.
• What is the unit of concentration?
• What is concentration of this solution?

Questions # 19

• What is meant by carbon dating?
• What is mole? Calculate the number of moles In 84 gram carbon.

More Important Questions for 9th Chemistry

The positive side of selfishness
• Clever egoists clearly hold opinions and never allow damage to their pride in defending their positions with a complete rejection of the imposed point of view. They are ready to make compromises in order to prevent a conflict misunderstanding and build the necessary protection for themselves and loved ones.

• Egoists who adhere to a reasonable approach to life issues retain their status, dignity and position, and also do not allow themselves to be manipulated and influence life activities.

• Sound-minded egoists express their opinion with firm confidence, adhering to confirmed and concrete facts. This can happen in the case of confrontation with other people’s opinions and a critical attitude towards judgments that have a tinge of disagreement and inconsistency of views.