Chemistry 9th Class Guess

 

Questions # 20

• Define chemical bond.
• What is meant by metric bond?
• Differentiate between lone pair and bond pair of electrons.
• Differentiate between Polar and non polar covalent bond.
• Describe at least two necessary conditions for the formation of a covalent bond.
• How coordinate covalent bond is formed in the hydronium ion?
• What is the cause of polarity in covalent bond?
• What type of covalent bond is formed in nitrogen molecule?
• Why have water polar covalent bonds?
• Define ionic bond, explain different steps in the formation of NaCr.
• What is a triple covalent bond, explain with an example?
• What is a coordinate covalent bond? Explain it with example.
• What is metallic bond? Explain the metallic bonding with the help of a diagram.
• Explain double covalent bond with the help of an example.
• Define hydrogen bonding. Explain how these properties affect the physical properties of compound.
• Define ionic bond and Why ionic compounds are easily soluble in water?
• Define coordinate covalent bond. How it is formed. Explain with examples.

Questions # 21

• Differentiate between Oxidizing agents and Reducing agents with the help of an example.
• Define reducing agent.

Questions # 22

• Which form of sculpture exists at room temperature?
• Define transition temperature.
• What is absolute temperature?
• What is general principle of solubility?
• What is absolute zero temperature?
• What is the effect of temperature on solubility?
• Define pressure and write its unit.
• What is vapor pressure and how it is affected by intermolecular forces?
• Why is vapour pressure higher at high temperature?
• Define atmospheric pressure.

Questions # 23

• Briefly describe the electrolysis of water.
• What is electrolysis?
• Describe the process that take place in the electrolysis of molten NaCI.

Questions # 24

• How can distinguish between solution and pure solvent?
• How you can explain the solute-solvent interaction to prepare a NaCl solution?
• Define solute and solvent.
• Differentiate between solute and solvent with examples of each.

Questions # 25

• Define aqueous solution.
• What does mean by unsaturated solution?
• Define super saturated solution When we dissolve 20 g of NaC1 in 400 cm3 of solution, what will be its molarity?
• What is molarity and give its formula to prepare molar solution?
• How much NaOH is required to prepare 500cm3 of 0.4M solution?
• What is the major difference between a solution and a mixture?
• Describe different ways of expressing the percentage composition of a solution.
• Describe Nelson’s Cell for the manufacture of Caustic soda from brine solution.
• What is meant by Molar Solution? How it is prepared.
• Compare the characteristics of solution, colloid and suspension.
• Why a solution is considered mixture?
• Differentiate between dilute solution and concentrated solutions with a common example.
• Why the alloys are considered solutions?

Questions # 26

• Define electron electivity.
• Define electro chemistry.
• How electro negativity does differ from electron affinity?
• What is electro negativity?
• What is the relationship between electro positively and ionization energy?
• What is relationship between electro negativity and polarity?
• Describe the trends of electro negativity in a period and in a group.

Questions # 27

• Why chlorine can accept only 1 electron?
• When does an electron emit or absorb energy?

Questions # 28

• What are synthetic adhesives?
• What you know about Epoxy adhesives?

More Important Questions for 9th Chemistry

 

 

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