Chem

IIT-JEE 2006-CH-1

FIITJEE Solutions to IITJEE–2006

Chemistry
Time: 2 hours Note: Question number 1 to 12 carries (3, -1) marks each, 13 to 20 carries (5, -1) marks each, 21 to 32 carries (5, -2) marks each and 33 to 40 carries (6, 0) marks each.
Section – A (Single Option Correct) 1.
B(OH)3 + NaOH NaBO 2 + Na[B(OH) 4 ] + H 2O How can this reaction is made to proceed in forward direction? (A) addition of cis 1, 2 diol (B) addition of borax (C) addition of trans 1, 2 diol (D) addition of Na2HPO4

Sol. 2.

(A) Due to formation of chelated complex, the reaction moves in forward direction. A solution when diluted with H2O and boiled, it gives a white precipitate. On addition of excess NH4Cl/NH4OH. the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in NH4OH/NH4Cl. (A) Zn (OH)2 (B) Al (OH)3 (D) Ca(OH)2 (C) Mg (OH)2 (A) Due to formation of tetraammine zinc (II) complex; Zn +2 + NH 4OH →  Zn ( NH 3 )4   
+2

Sol.

3.

When benzene sulfonic acid and p-nitrophenol are treated with NaHCO3, the gases released respectively are (A) SO2, NO2 (B) SO2, NO (D) CO2, CO2 (C) SO2, CO2 (D)
SO3H SO3Na
OH ONa

Sol.

+ NaHCO3 →

+ CO 2 + H 2O

+ NaHCO3 →

+ CO 2 + H 2O

NO2

NO2

4.

A monatomic ideal gas undergoes a process in which the ratio of P to V at any instant is constant and equals to 1. What is the molar heat capacity of the gas? 4R 3R (B) (A) 2 2 (C) 5R/2 (D) 0 (A) (I) 1,2-dihydroxy benzene (II) 1,3-dihydroxy benzene (III) 1,4-dihydroxy benzene (IV) Hydroxy benzene The increasing order of boiling points of above mentioned alcohols is (A) I < II < III < IV (B) I < II < IV < III (C) IV < I < II < III (D) IV < II < I < III (C)

Sol. 5.

Sol.

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IIT-JEE 2006-CH-2

6.

CH3-CH=CH2 + NOCl → P Identify the adduct....