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Type of Announcement : ISAT Model Question Paper Chemistry
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CHEMISTRY
1. Which one of the following is the correct statement?
i. Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase.
ii. B2H6.2NH3 is known as 'inorganic benzene'.
iii. Boric acid is a protonic acid.
iv. Beryllium exhibits coordination number of six.
Ans : i
2. The pKa of a weak acid, HA is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be
i. 7.01
ii. 9.22
iii. 9.58
iv. 4.79
Ans : i
3. Amount of oxalic acid present in a solution can be determined by its titration with KMnO4solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl
i. reduces permanganate to Mn2+.
ii. oxidises oxalic acid to carbon dioxide and water.
iii. gets oxidised by oxalic acid to chlorine.
iv. furnishes H+ ions in addition to those from oxalic acid.
Ans : i
4. Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is
i. R2SiCl2
ii. R3SiCl
iii. R4Si
iv. RSiCl3
Ans : iv
5. Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
i. Metal sulphides are less stable than the corresponding oxides.
ii. CO2is more volatile than CS2.
iii. Metal sulphides are thermodynamically more stable than CS2.
iv. CO2is thermodynamically more stable than CS2.
Ans: i
6. Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives
i. p-nitrophenol
ii. nitrobenzene
iii. 2,4,6-trinitrobenzene
iv. o-nitrophenol
Ans : iv
7. The organic chloro compound, which shows complete stereochemical inversion during a SN2 reaction, is
i. (CH3)2CHCl
ii. CH3Cl
iii. (C2H5)2CHCl
iv. (CH3)3CCl
Ans : ii
8. Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotized and then heated with cuprous bromide. The reaction mixture so formed contains
i. mixture of o-; and p-bromoanilines
ii. mixture of o- and m-bromotoluenes
iii. mixture of o- and p-bromotoluenes
iv. mixture of o- and p-dibromobenzenes
Ans: iii
9. At 800C, the vapour pressure of pure liquid 'A' is 520 mm Hg and that of pure liquid 'B' is 1000 mm Hg. If a mixture solution of 'A' and 'B' boils at 800C and 1 atm pressure, the amount of 'A' in the mixture is (1 atm = 760 mm Hg)
i. 48 mol percent
ii. 50 mol percent
iii. 52 mol percent
iv. 34 mol percent
Ans: ii

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I am varun Puri appearing XIIth class 2013 form CBSE New Delhi. I would like to take admission in B tech this year 2013. Kindly send me some information regarding admission. How can geting application form ,and does start. Please give the information.

@Varun Puri :
Admission to Under Graduate Programmes (B.Tech. 2013):
Who can apply ?
Only Indian citizens can apply for admission to IIST. The date of birth of candidates belonging to GEN and OBC (NCL) categories should be on or after October 1, 1988, while the date of birth of those belonging to SC, ST and PD categories should be on or after October 1, 1983.

Eligibility :
After qualifying the Joint Entrance Examination, JEE (Main)–2013 conducted by CBSE, the candidate must appear for IIT-JEE(Advanced)-2013 and score the following minimum prescribed category-wise marks in JEE(Advanced)-2013:
(a) General Candidates: At least 5% marks in each of the three subjects (Physics, Chemistry and Mathematics) and 20% marks in aggregate.
(b) OBC (NCL) Candidates: At least 90% of the marks prescribed for General Candidates under (a).
(c) SC, ST & PD Candidates: At least 50% the marks prescribed for General Candidates under (a).

The marks secured by the candidate in JEE(Advanced)-2013 examination will be used only for deciding his/her eligibility for admission, and will not be considered for preparing the rank list for admission to IIST.

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