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Microsoft word - chemistry

MODEL PAPER “CHEMISTRY”
Intermediate Part-II Examination, 2008 &Onward
Figures__________
Words___________
OBJECTIVE
20Minutes
Note: Write your Roll No. in space provided. Over-writing, Cutting,
Erasing, Using lead pencil will result in loss of marks.

Q.No.7. Each question has four possible answers. Choose the correct answer

and encircle it.
Mark the correct statement: (a) Covalent character of metal halides increases from left to right in a period. (b) Boiling points of group IV-A hydrides decrease down the group. (c) Ionic character of hydrides increase from left to right in a period. (d) The basicities of group II-A oxides decrease on descending the group. Alkali metals are chemically similar because: (b) their outermost electrons have the same principal quantum number. (c) their valence shell electronic configuration is same. (d) their valence shell electrons are equally energetic. A12O3 . 2H2O (c)
A12O3. H2O
Point out the correct statement about halogens : (a) They can mutually displace each other from the solution of their compounds with metals (b) They are all capable of showing several oxidation states (c) They are all diatomic and form divalent ions (d) They are diatomic and form univalent ions The colour of transition metal complexes is due to: (vii) Geometrical isomerism in alkenes is due to: (a) oscillation of H-atoms between two polyvalent carbon atoms (b) optical rotation due to multiple bond (d) restricted rotation about C = C bond (viii) When an unsymmetrical olefin like (CH
3)2 CHCH = CH2
with dil.H
Aromatic compounds burn with sooty flame because: (a) they have high percentage of hydrogen Alkyl halides are considered to be very reactive compounds towards (b) they have an electrophilic carbon and a good leaving group (c) they have an electrphilic carbon and a bad leaving group (d) they have a nucleophilic carbon and a good leaving group What is the name of the reaction when C2H5 ONa +C2H5l gives an ether.
(a) alkaline solution containing potassium taratrate (b) alkaline solution containing potassium citrate (xiii) Organic compounds X and Y react togheter to form organic compound Z. what types of compounds can X, Y and Z be?
X
(a) unsaturated fatty acids (b) glycerides of unsaturated fatty acids (c) glycerides of saturated fatty acids (xv) Which sequence of steps is correct for the manufacture of cement: (xvi) One of the following is not the affect of acid rain. Point out that: (a) It increases the percentage of CO in the atmosphere
(b) It leaches metals like aluminum, mercury and lead from soil (c) It damages the buildings
(d) It decreases the pH of natural rain
MODEL PAPER “CHEMISTRY”
Intermediate Part-II Examination, 2008 & Onward
SUBJECTIVE
Time: 2:40Hours
Marks: 68

Note: - Attempt any TWENTY TWO (22) questions from Section -I and

any THREE questions form Section-II


SECTION -I

Q.No.1. Attempt any TWENTY TWO (22) questions.
(22x2)=44
The melting and boiling points of the elements increase from left to the right upto the middle of s- block elements and decrease onwards. Why? The hydration energies of the ions are in the following order. Give reason How magnesium and calcium react with nitrogen to give nitrides Why the aqueous solution of Na
Which basic radicals give the response to borax bead test? (vii) What is the effect of temperature on semiconductors? (viii) How does HNO act as a reducing agent?
is a powerful dehydrating agent. Give one example. Why SO gas is dissolved in
What do you mean by available chlorine and how is it calculated? (xii) Why HF is a weaker acid than HCl?
(xiii) Why the maximum paramagnetic strength is associated with the middle (xiv) How does the metallic coating prevent the corrosion? (xv) Write the equation of chromyl chloride test for KCl.
(xvi) Give four examples of aromatic heterocyclic compounds. (xvii) How do you convert alkynes into cis and trans alkenes? (xviii) How Baeyer’s test is employed to check the presence of carbon-carbon double (xix) Write down the resonance structures of benzene and indicate their relative contributions towards the actual structure of benzene: (xx) How does ozone affect benzene to give glyoxal? (xxi) Give the general pattern of the raction of SN - mechanism and its rate
(xxii) Show the mechanism for the reaction of acetone with Grignard’s reagent: (xxiii) Ethanol gives different products with conc. H
(xxiv) How the resonance structures of phenoxide ion make phenol acidic? (xxv) How acids and bases acting as catalysts increase the reactivity of aldehydes (xxvi) How aldehydes react with alcohols to give hemiacetals and acetals? (xxvii) Write the structures of dimers of carboxylic acids? (xxviii)How do you justify the cyclic structure of glucose from its open chain structure? (xxix) Give the idea of saponification number. (xxx) Mention the importance of potassium fertilizers. (xxxi) Name commonly use bleaching agents in paper manufacture? (xxxii) How COD is measured?
(xxxiii) Mention the side effects of incineration. SECTION -II

Note: - Attempt any THREE questions.


Q.No2. (a)

Compare the chemical behaviour of lithium with magnesium. (a) Oxyfluorides of xenon. (b) Applications of noble gases. Complete and balance the following chemical equations.
Q.No3. (a)

How does the electronic configuration of valence shell affect the 3
following properties of the transition elements?
(a) Binding energy
Discuss the wet process for the manufacturing of cement with the 3
help of flow sheet diagram.
What are nucleic acids? Write down the role of DNA and RNA
Q.No4. (a)
What do you understand by the term β-elimination reaction? Explain
briefly the two possible mechanisms of β-elimination reactions. 3
Explain the type of bonds and shapes of the following molecules using hybridization approach. CH2 = CH2, CH = CH, HCHO
Compare the reactions of phenol with that of ethanol. Discuss the 2
difference if any.
Q.No5. (a)
Stating from ethane, outline the reactions for the preparation of
following compounds.
(b) How does propyne react with the following reagents?
(a) AgNO3/NH4OH
Cu2Cl2/NH4OH
(c) H2O/H2SO4,HgSO4
(c) What are α-amino acids, proteins and peptides? How are they related? 2
Q.No6. (a)
Give the mechanisms of following reactions: (a) Kolbe’s electrosynthesis (b) Nitration of benzene (c) Reaction of acetone with Gingiard’s reagent. (b) Disscuss oxidation of (a) aldehydes (b) ketones with:
(b)Tollen’s reagent (c) Fehling’s solution 2Cr2O7/H2SO4
(c) How detergents are threat to aquatic animal life?

Source: http://www.times.edu.pk/S_Paps/II/Chemistry.pdf

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