TyroCity: Chemistry Notes

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

Metal and Metallurgical Principles

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

Name the process for concentration of sulphide ore.
Which metals can be extracted from the following ores:

Galena, cinnabar, argentite and zinc blend

Distinguish between calcination and roasting.
What is meant by aluminothermite process?
What is meant by Slag? Why is it important in metallurgy?
Which process is applied for the concentration of sulphide ore and why?
Can Sodium be extracted by the electrolysis of aqueous solution of sodium chloride? If not, why?
Distinguish between flux and slag with examples.

Define aqueous tension. Why is it subtracted from the total pressure to determine the pressure of a dry gas?

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

Ans: Aqueous tension is defined as the partial pressure of the water vapour present in the moist gas.
When the gas is colleced over the water, it becomes moist due to presence of small quantity of water vapour caused by evaporation.
Then, pressure exerted by moist gas = pressure exerted by dry gas + pressure of water vapour (aqueous tension).
i.e. Pmoist = Pdry + f (aqueous tension)
or, Pdry = Pmoist – f
Therefore, aqueous tension should be subtracted from the total pressure to get pressure of the dry gas.

What is the effect of temperature on-

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

Surface tension:- It decreases on increase in temperature and vice versa.

Viscosity:- It decreases on increase in temperature and vice versa.

Vapour pressure:- It increases with increase in temperature and vice versa.

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.

Chemistry XI Questions

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

Question Collection

NEB Model Question for Chemistry – Class 11

General and Physical Chemistry

Language of Chemistry

Language of Chemistry

Chemical Arithmetic

State of Matter: Gaseous State

Gaseous State

State of Matter: Liquid State

State of Matter: Solid State

Solid State

Atomic Structure

Atomic Structure

Nuclear Chemistry

Nuclear Chemistry

Electronic Theory of Valency and Bonding

Electronic Theory of Valency and Bonding

Periodic Classification of Elements

Periodic Classification of Elements

Inorganic Chemistry

Non-Metal I

Non-Metals II

Metal and Metallurgical Principles

Metal and Metallurgical Principles

Alkali Metals

Alkali Metals

Alkaline Earth Metals

Alkaline Earth Metals

Organic Chemistry

Introduction to Organic Chemistry

OTHER TOPICS

In terms of vapour pressure, what do you mean by a boiling point of a liquid?

In terms of vapour pressure, what do you mean by a boiling point of a liquid?

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

Ans: Boiling point is the temperature at which the vapour pressure becomes equal to atmospheric pressure.

Ozone

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

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

Why does boiling point of liquid rise on increasing pressure?

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

As the pressure applied to the liquid surface is increased, the energy needed for the liquid molecules to expand to gas phase also increases. Hence, a higher temperature is required to change liquid to gas phase. So, boiling point of liquid rises on increasing pressure.

Sulphur- Old is Gold

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

How is the moisture present in SO2 gas removed?
Acid rain forms when oxides of sulphur and nitrogen react with water. What are these oxides chemically?
Identify a viscous liquid that react with table sugar (C12H22O11) giving a charred (black) mass. Give the reaction involved.
Give two examples of reactions in which H2SO4 behaves as: (a) Strong acid (b) a dehydrating agent (c) an oxidizing agent
Explain with reason, why: (a) Conc. H2SO4 should always be added to H2O but never H2O to the acid? (b) Sugar is charred in contact with conc. H2SO4?
Write any two differences between the bleaching action of Cl2 and SO2.
What happens when H2S is passed through acidified potassium permanganate solution?
What happens when gas obtained by heating oxalic acid in presence of conc. H2SO4 is passed through heated caustic soda?
Write balanced chemical reactions for the laboratory preparation of: (a) Hydrogen Sulphide (b) Sulphurdioxide
What happens when a moist red flower is introduced into a gas jar containing SO2 gas?
Give a reaction of each to show: (a) SO2 as an oxidizing agent (b) H2S as an analytical agent

Give reason.

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

a) Falling liquid drops are spherical.
Due to surface tension. Surface tension is the property of liquid due to which it tries to aquire minimum surface area. Since, for a given volume sphere has a minimum surface area, a mercury droplet is spherical.

b) Evaporation takes place from the surface of liquid.
Since, the kinetic energy of the surface molecule is greater than the bulk molecule, evaporation takes place from the surface of liquid.

c) It is more efficient to wash clothes in hot water than cold water.
Surface tension decreases on increase in temperature. Due to this hot water can wet the clothes more effectively then cold water. So, it is more e to wash clothes in hot water than cold water

Solid State

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

Explain why sodium chloride does not conduct electricity in solid but a good conductor when molten.
Distinguish between crystalline and amorphous solid.
Distinguish between Crystal Lattice and unit cell.