TyroCity: Chemistry 11 Notes

Halogens (Chlorine, Bromine and Iodine)

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

Why halogens are never found in the Free State in nature?
A test tube contains a solution of one of the following salts: NaCl, NaBr and NaI. Describe a single test that can distinguish among these salts.
Give any one chemical reaction to prepare chlorine gas from hydrochloric acid.
Give a chemical reaction to show oxidizing action of chlorine.
How would you obtain bromine from HBr?
What happens when KBr is heated with conc. H2SO4 acid?
Why can’t HI be prepared by the action of conc. H2SO4 on NaI?
Give the action of

(i) KI on copper sulphate solution

(ii) Heat on lime stone.

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.

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

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

Ans: Evaporation is defined as the process of conversion of liquid into vapor from the surface of the liquid at room temperature.

Evaporation	Boiling
It takes place at any temperature.	It takes place at boiling point only.
It takes place at the surface of liquid.	It takes place at the entire volume of the liquid.
It is slow and silent process.	It fast and noisy process.

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

Why are noble gases chemically inert?
What are noble gases? Write any one use of noble gases.
The first ionization energy of noble gases is higher than that of halogens. Explain.
Give an important use of noble gases.

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

What is limiting reactants? Why is it essential in stoichiometric calculations?
10.6gm of pure Na2CO3 if treated with 7.9gm of HCl to produce NaCl, H2O and CO2, (5 marks)

a) Find the limiting reactants and calculate mole of unreacted reagent left over.

b) What volume of CO2 gas is produced at NTP?

c) Calculate the mass of NaCl formed.

A chemical reaction was carried out by mixing 25gm of pure Calcium Carbonate and 0.75 mule of pure hydrochloric acid to give CaCl2, H2O and CO2. (5 marks)

a) Which one is the limiting reactant and why?

b) Calculate the mass of CaCl2 produced.

c) How many numbers of water molecules are formed?

d) What mass of NaOH is required to absorb the whole CO2 produced in the reaction?

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

What is the main product obtained when sodium is allowed to react with dry ammonia at 300°-4000°C.
Why alkali metals cannot be obtained by chemical reduction method?
What are the chemical formulae of caustic soda, washing soda and baking soda? What are their main uses?
What happens when a piece of sodium is dropped into water?
What is the biological importance of sodium?
What would happen when the nitrate of an alkali metal is heated?

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

Show that nascent hydrogen is powerful reducing agent than molecular hydrogen.
List all the possible istopes of hydrogen. Name the isotope which does not contain neutron.
Give a reaction which shows that water contains hydrogen.
When steam is passed through red hot coke, a mixture of two gasses is obtained. Name the gases and write the reaction involved.
What happens when zinc dust is added to an acidified solution of potassium permanganate.
Differentiate between ortho and para hydrogen.
Mention important uses of eacho of the followings: a) Heavy water b) Ozone Layer c) Hydrogen gas d) Deuterium e) Tritium f) Nascent hydrogen