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GE 105
Question 1. Short questions:
(i) If n is equal to 13, what are the values of quantum numbers l amd m?
(ii) What is first law of thermodynamics?
(iii) What is Aufbau Principle?
(5 marks)
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(iv) What is coordinate covalent bond?
(v) Classify polymers on the basis of molecular force with examples.
Question 2. Multiple choice questions: (Tick the right one)
(5 marks)
(i) Entropy can be denoted as:
(a) H
(b) T
(c) E
(d) S
(ii) What is the molecularity of the reaction 2NO + O2
(a) 1
(b) 2
(c) 3
2NO2 ?
(d) 4
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(iii) Soda-lime glass or soft glass is widely used for:
(a) Chemical apparatus
(b) Lenses
(c) Automatic opening doors
(d) Window glasses
(iv) “An orbital can have maximum two electrons and these must have opposite spins” is
(a) Heisenburg uncertainity principle
(b) Hund’s rule
(c) Pauli exclusion principle
(d) Rutherford atomic model
(v) The electronic configuration of element of atomic number 23 is:
(a) 1s2, 2s2, 2p6, 3s2, 3p6, 3d4, 4s1
(b) 1s2, 2s2, 2p6, 3s2, 3p6, 3d5
(c) 1s2, 2s2, 2p6, 3s2, 3p5, 3d6
(d) 1s2, 2s3, 3s2, 3p6, 3d10
Question 3. Answer following
(10 marks)
(i) Give the IUPAC name of the following structures:
(a)
(b)
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(ii) Write down the chemical composition of Portland cement.
Write down the manufacturing steps of Portland cement.
(iii) Explain the mechanism of electrolysis.
OR
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(iv) Draw the geometry of trigonal planar molecule (BF3) according to VSEPR theory.
(v) Mention the types of catalysis with example.
Question 4. True or False
(6 marks)
(a) CaSO4.2H2O is a chemical formula of gypsum
(b) Principal quantum number is denoted by the letter ‘n’
(c) Tea placed in an open cup is the example of close system
(d) Isobaric is a process during which the pressure of the system is kept constant
(e) Nylons are the example of branched polymers
(f) Electron is a negatively charged particle
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Question 5. Numerical problems
(14 marks)
(i) 5.75 gm of coal was weighed into a silica crucible. After heating for one hour at 100 0C,
the residue weighed 3.795 gm. The crucible was then covered and strongly heated for exactly
seven minutes at 9500 C. The residue weighed 2.124. The crucible was then heated without
the cover, until a constant weight was obtained. The last residue was found to weight 0.914
gm. Calculate the percentage results of the above analysis.
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(ii) Identify the gas law in each following case:
(a)
P =1 atm
P = 2 atm
Increase pressure
Decrease pressure
V=1L
(b)
P =1 atm
V = 0.5 L
P =1 atm
Add gas
V = 48 L
V = 22 L
Remove gas
n = 1 mol
n = 2 mol
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(iii) At 5000 C, the reaction between N2 and H2 to form ammonia (N2 + 3 H2
2 NH3)
has Kc = 6 × 10-2. What is the value of Kp?
(iv) Identify the order of a reaction order from each of the following rate constant:
(i)
k = 2.3 × 10-5 litre mol-1 sec-1
(ii)
k = 3.1 × 10-4 sec-1
(iii)
k = 9.3 × 10-4 mol litre-1 sec-1
(v) One mole of gas is allowed to expand from a volume of 1 litre to a volume of 5 litres
against the constant external pressure of 1 atm (1 atm= 101.3 J). Calculate the amount of
work done.
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(vi) Calculate the internal energy change in each of the following cases:
(a) A system absorbs 5 kJ of heat and does 1 kJ of work.
(b) 5 kJ of work is done on the system and 1 kJ of heat is given out by the system
(vii) Calculate the oxidation number of:
(a) P in H3PO4 and
(b) S in S2O32-