TyroCity: Chemistry 11 Notes

What do you understand by the term surface tension?

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

Ans: Surface tension is defined as the property of the liquid due to the inter molecular force of attraction between the liquid molecules due to which liquid tries to gain minimum surface area.

Environmental Pollution- Old is Gold

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

What is meant by acid rain? Give one major effect of acid rain.

Equivalent Mass

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

Equivalent weight of an element is 32.5. What does it mean?
Why is hydrogen displacement method not applicable to determine the equivalent mass of copper?
Define equivalent weight of an element. A divalent metal has atomic weight 24. What is its equivalent weight?
4gm of a divalent metal reacts with chlorine to produce 11.1gm of its metal chloride. Calculate the atomic mass of metal.

Liquid State Question

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

Name the physical property behind rise of liquids in capillary tube.
Define aqueous tension. Why is it subtracted from the total pressure to determine the pressure of a dry gas?
What is evaporation? How does it differ from boiling?
Define coefficient of viscosity. How coefficient of viscosity is related with viscous force?
Why is Glycerine more viscous than water?
Why is a mercury droplet spherical?
In terms of vapour pressure, what do you mean by a boiling point of a liquid?
The meniscus for mercury in a glass tube is concave downward. Explain.
What do you understand by viscosity?
What is the efect of temperature on: (a) Surface tension (b) Viscosity (c) Vapour pressure of liquid
What do you understand by the term ‘surface tension’?
How is surface tension of a liquid originated?
Define Van’t Hoff’s factor. What for it used?
What do you mean by boiling point and evaporation?
Give reason:

a) Falling liquid drops are spherical
b) Evaporation takes place from the surface of liquid
c) It is more efficient to wash clothes in hot water than cold water.

What happens to the vapour pressure of a solvent, when non volatile solute particles are dissolved in it?
Define the term coefficient of viscosity?
Why does boiling point of liquid rise on increasing pressure?
Mention physical properties of liquid due surface tansion.

Why is a mercury droplet spherical?

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

Ans: Due to surface tension. Surface tension is the property of liquid due to which it tries to acquire minimum surface area. Since, for a given volume sphere has a minimum surface area, a mercury droplet is spherical.

Ozone

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

Write resonance structures of ozone.
How does CFC deplet Ozone layer?

NEB Model Question for Chemistry – Class 11

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

NEB QUESTION MODEL OF CHEMISTRY
GRADE : 11
FOR : 2070

Exam Oriented Model Question
Time : 3 hrs

Full Marks : 75

Pass Marks : 27
Group ‘A’

Attempt any Fifteen question : 15 × 2 = 30

Q.1. State Law of reciprocal proportion.

Q.2. The oxide of an element contains 67.67 % of oxygen and V.D. of its volatile chloride is 79

Q.3. Define surface tension of Liquid.

Q.4. Write down important differences between crystalline and amorphous solid.

Q.5. What is Pauli’s exclusion principle ?

Q.6. Give the values of all four quantum numbers of 11th electron of magnesium.(At. No. 12)

Q.7. What is radioactivity ?

Q.8. Write the Lewis structure of (a) H2O2 and (b) HNO3.

Q.9. Explain why HCL has polar character though it has covalent bond.

Q.10. State Modern Periodic law.

Q.11. How would you show the following reaction is a redox reaction?
Mg + Cl2 —————> MgCl2

Q.12. State Le-Chateliers principles.

Q.13. What are the difference between nascent and molecular hydrogen ?

Q.14. name any two oxides of each of the following :
(i) amphoteric
(ii) neutral.

Q.15 What is allotropy ? Name the latest discover allotropic form of carbon.

Q.16. What is meant by acid rain ? Give one major effect of acid rain.

Q.17. Distinguish between flux and slag with one example of each.

Q.18. Can sodium be extracted by the electrolysis of aqueous solutions of sodium chloride ? If not why ?

Q.19. Define electrophile and nucleophile with an example of each.

Q.20. Give IUPAC name of the following compound.
a) CH3-CH(Br)-CH(NH2)-COOH
b) CH3-C(CH3)2-C9OH)H-CH3

Q.21. What is meant by thermal cracking and catalytic cracking ?

Q.22. Identify A and B in the following reaction and give their IUPAC name.

Group ‘B’

Attempt any five Question. 5 * 5 = 25

Q.23. Urea [(NH2)2CO] is prepared by reacting ammonia with carbon dioxide :
2NH3(g) + CO2(g) —–> (NH2)2CO(aq.) + H2O(l)
In one process, 637.2 g NH3 is treated with 1142g of CO2.
(a) Which of the following reactant is the limiting reactant ?
(b) Calculate the mass of urea formed
(c) How much excess reagent (in gram) is left at the end of the reaction ?
Q.24 State Avogadro’s law. Using the law to deduce relationship between Molecular mass and vapour density.
Q.25. State and explain Hund’s rule of maximum multiplicity.
Q.26. Specify Oxidation half, reduction half, oxidizing agent and reducing agent. Balance the following equation by ion-electron or oxidation number method :
Fe2+ + H+ + NO3– ——–> Fe⁺³ + NO + H2O
Q.27. Describe the manufacture of nitric acid by Ostwald’s process.
Q.28. Explain the laboratory preparation of carbon monoxide in laboratory What happens when CO is passed through finely divided nickel ?
Q.29. Describe the detection of foreign element (N,S,X) in organic compounds.

Group ‘C’

Attempt any two questions. : 2 × 10 = 20

Q.30. State Boyle’s law and Charles law. Derive PV=nRT. What is the density (in gram per liter) of ammonia at STP if the gas in a 1.0L bulb weights 0.672g at 25oC and 733.4 mm Hg pressure.

Q.31 Describe the manufacture of sodium carbonate by ammonia soda process. Also, mention the function of limestone in the manufacture process.

Q.32. Write down the process involved in the manufacture of caustic soda by Solvay-Kellner’s process.

Verification of (Boyle's + Charles) Law

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

VERIFY BOYLE’S LAW WITH THE HELP OF K.M.T

According to Boyle’s law at constant temperature, pressure & volume of a gas are related as:

PV = constant

According to Kinetic theory, pressure of a gas is

VERIFY CHARLES LAW WITH THE HELP OF K.M.T
According to Charles law at constant pressure, absolute temperature & volume of a gas are related as:
V/T = constant
According to Kinetic theory, pressure of a gas is

Avogadro’s Hypothesis and Its Application

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

In what ways have Avogadro’s hypothesis given support to Dalton’s atomic theory?

Alkaline Earth Metals

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

Name the alkaline earth metals and write their symbols also.
Give the formulae of Bleaching powder and blue vitriol.
Write the chemical formula and one of the uses of Epsom salt, plaster of paris and quick lime.
How is quick lime prepared from marble? Give pertinent equation.
How is plaster of paris prepared?
Explain with suitable chemical reactions:

a) Quick lime produces hissihg sound when added into cold water.

What is meant by slaking of lime? How is lime waterprepared from slaked lime?
Why is plaster of paris suitable for immobilising of broken limbs?
Starting from quick lime, how would you prepare lime water? What is meant by milk of lime?

Mention physical properties of liquid due surface tension.

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

Spherical shape of liquid drop.

Rise and fall of liquid in a capillary tube.

Oxygen

Chemistry 11 Notes — Sat, 12 Jul 2014 05:41:42 +0000

Write the names of any two neutral oxides with their formulae.
What are neutral and amhoteric oxides? Give one example of each.
What are oxides? Classify the following oxides justifying the classification: a) NO b) CO2 c) ZnO d) CaO
Mention one example of each of the following: i. Allotrope of oxygen ii. Amphoteric oxide iii. Most abundant isotope of hydrogen iv. Neutral oxide