Punjab Technical University 2007 A.M.I.E General Branch of Engineering Subjects Chemistry - Question Paper

(i) Less reactive than potassium
(ii) More reactive than potassium (2 Marks)
5. choose from the list 1 element that is
(i) Used in atomic clocks
(ii) Radio-active and artifically produced. (2 Marks)



part - II

Q2.
A. provide reasons for the use of sulphuric acid in
(i)Galvanization (ii) In lead accumulators
B. Draw a labelled diagram for electroplating of an article with nickel. State the reaction at the cathode and
anode in the above process.
C. discuss with examples substitution reactions of alkanes.
D. How many moles of NaOH are contained in 16Og of NaOH?

Q3.
A] (10 Marks)
provided beneath is an incomplete flow chart outlining the extraction of iron. Complete the chart by replacing the numbers.
4+5+ore
¯
Haematite -->1--> concentrate Ore --> two -->3 --> Pigiron

B] Summarize the blast furnace reactions. Also state in which zone every reaction occurs (10 Marks)


Q4
accurate the subsequent equations and provide a suitable explanation for every. (10 Marks)

1. ZnO + CO --> Zn + CO2

2. 2Al2O3 + 3C --> 4Al + 3CO2

3. Al2O3 + 2Fe --> Fe2O3 + 2Al

4. 4Ag + O2 --> 2Ag2O

D
5. Na2CO3 -->Na2O + CO2

Q5
(A) Zinc sulphide, when heated in air reacts according to the subsequent formula : (3 Marks)

2ZnS + 3O2 --> 2ZnO + 2SO2. compute :

(a) The wt of ZnO formed if 388 gm of ZnS is heated.
(b) The wt of ZnS needed to produce 5.6 litres of SO2 at s.t.p.
(c) The number of moles of O2, needed at the identical time.

(B) A hydrocarbon contains 82.8% Carbon. If its vapour density is 29, obtain its molecular formula. (3 Marks)

(C) The molecular weight of a gas is 70. compute the weight of the gas if it occupies a vol of 20 lit at 27°C and
700 mm of pressure. (3 Marks)

(D) What is Denatured Alcohol? (1 Mark)

Q6 provide the reasons for the use of : (10 Marks)

1. Aqua regia in dissolving noble metals.

2. Hydrogen Sulphide as an analytical reagent in the laboratory.
3. Ammonium Carbonate as a smelling salt.
4. Liquor ammonia as a cleaning agent.
5. Sulphur in the manufacture of gun powder.

Q7
a. What is Dobereiner Triads? (2 Marks)
b. If a crop of wheat removes 20 kg of nitrogen per hectare of soil, what mass of the fertilizer Calcium
nitrate Ca(NO3)2 would be needed to change nitrogen in 10 hectare field? (N=14, O=16, Ca=40).
ans to closest K9. (3 Marks)
c. Complete the subsequent equations. (4 Marks)
i) Mg3N2 + 6H2O -->
ii) 2NH3 +3CuO -->
iii) 8NH3 +3Cl2 -->
iv) 4NH3 5O2 -->
d. Determine the valency of nitrogen in (1 Mark)
(i) Nitric Oxide (ii) Nitrogen dioxide

Earning:   Approval pending.