# CHEMISTRY-(13th) (POI) Paper-1.pdf

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### CHEMISTRY-(13th) (POI) Paper-1.pdf

• 1. Q.26 For reaction A  B, the rate constant k1 = A1 RT / e 1 Ea  and for the reaction P  Q, the rate constant k2 = A2 RT / e 2 Ea  . If A A1 = 108 A2 = 1010 and Ea1 = 600 cal/mol, Ea2 = 1200 cal/mol, then the temperature at which k1 = k2 is (R = 2 cal/K-mol) (A) 600 K (B) 300 × 4.606 K (C*) 606 . 4 300 K (D) 600 606 . 4 K Q.27    HCl total No. of Markwonikoff 's products in above reaction is (A) 1 (B) 3 (C*) 2 (D) 4 [Sol. H2 addtion is syn addition  + Total 2 stereoisomers. Ans. C] Q.28 The correct solubility order is / are (I) CaCO3 > SrCO3 > BaCO3 (II) Li2CO3 < Na2CO3 < K2CO3 (III) K2CO3 < Rb2CO3 < Cs2CO3 (IV) Na2CO3 > K2CO3 > Rb2CO3 (A) II, IV (B) I, IV (C) II, III, IV (D*) I, II, III Q.29 Calculate the maximum work done by the gas when pressure on 10 gm of H2 is reduced from 20 to 2 atm at constant temperature of 300 K. The gas behaves ideally. (A*) 28.72 kJ (B) 28.72 J (C) 2.872 kJ (D) 2.872 J Q.30 Arrange in order of decreasing reactivity in electrophilic addition (I) Ph CH = CH COOH (II) p–NO2–C6H4–CH=CH COOH (III) p–MeO C6H4CH = CH COOH (IV) p–ClC6H4CH = CHCOOH (A) II >I > IV > III (B) III > IV > I > II (C*) III > I > IV > II (D) II > IV > I > III Q.31 The structure of B3N3H6 is as follows How many derivative structures of B3N3H4X2 can be derived from the basic structure, by the replacement of two hydrogen atoms? (A) 2 (B) 3 (C*) 4 (D) 5 Q.32 The difference in H and U from combustion of solid benzoic acid(s) at 300 K is equal to (A*) –1.247 kJ (B) +1.247 kJ (C) –1.247 J (D) +1.247 J
• 2. Q.33 Correct order of rate of hydrolysis for following compounds is [I] [II] [III] [IV] (A*) III > II > IV > I (B) I > II > III > IV (C) III > I > II > IV (D) III > II > I > IV [Sol. 1–bromotriptycine is 1023 times less reactive than Ph3C–Br which is 1011 times less reactive than tropylium bromide ] Q.34 Select incorrect statement regarding silver extraction process (A) When the lead-silver alloy is rich in silver, lead is removed by the cupellation process. (B) When the lead-silver alloy is rich in lead, lead is removed by parke's or pattinson's process. (C*) Zinc forms an alloy with lead, from which lead is separated by distillation (D) Zinc forms an alloy with silver, from which zinc is separated by distillation. Q.35 Equilibrium constant for the given reaction is K = 1020 at temperature 300 K A(s) + 2B (aq) l 2C (s) + D (aq) K = 1020 The equilibrium conc. of B starting with 1 mole of A and 1/3 mole/litre of B is (A*) ~ 4 ×10–11 M (B) ~ 2 ×10–10 (C) ~ 2 ×10–11 (D) ~ 10–10 Q.36 How many alkyl chlorides (without considering stereoisomers) would yield 1,3- dimethyl-cyclohexane on conversion into the grignard reagent followed by treatment with absolute ethanol. (A) 3 (B) 4 (C*) 5 (D) 6 [Sol. (1) (2) (3) (4) (5) ] Q.37 SO3 2– + S*   boil SS*O3 2– SS*O3 2– + 2H+  H2SO3 + S* The above reaction sequence proves (A*) Two sulphur atoms of thiosulphate are not equivalent (B) Both are equivalent (C) Both of the above are correct (D) None of these
• 3. Q.38 2 NH C R | | O   HCl NaNO2      A A final product A is: (A*) OH C R | | O   (B) Cl C R | | O   (C) 2 NO C R | | O   (D)  Cl N C R | | O 2    [Sol. NaNO2 + HCl converts NH2 into OH ] Q.39 The silicate anion in the mineral kinoite is a chain of three SiO4 terahedra, that share corners with adjacent tetrahedra. The charge of the silicate anion is (A) –4 (B*) –8 (C) –6 (D) –2 Q.40 Propene is treated with bromine in the presence of brine (aqueous NaCl). Choose the correct statement regarding the above reaction. (A) Total two products are formed. (B) Total three products are formed. (C*) Total six products are formed. (D) Total eight products are formed. [Sol. Br | Br C * C C | H    ; H | Br C * C C | Br    ; Cl | r B C * C C | H    ; H | Br C * C C | Cl    ; OH | Br C * C C | H    ; H | Br C * C C | OH    ] Q.41 The oxide of a metal (R) can be reduced by the metal (P) and metal (R) can reduce the oxide of metal (Q). Then the decreasing order of the reactivity of metal (P), (Q) and (R) with oxygen is (A) P > Q > R (B*) P > R > Q (C) R > P > Q (D) Q > P > R Q.42 The product(s) of the reaction      H is: (I) (II) (III) (IV) (A) II, III and IV (B) II and IV (C) only I (D*) only IV [Sol.        expansion Ring ]
• 4. Q.43 Select the incorrect statement. (A) Chelation effect is maximum for five & six membered rings (B) Greater the charge on the central metal cation, greater the value of (CFSE) (C*) In complex ion [COF6]3–, F– is a weak field ligand, so that oct < P (Pairing energy) and it is low spin complex. (D) [CoCl2(NH3)2 (en)]complex ion will have four different isomers. Q.44 A polymer on ozonolysis gives 2,5 – hexanedione only. Hence, the monomer of the polymer would be (A*) (B) (C) (D) [Sol. Polymer is: ] Q.45 [CoCl2(NH3)4] + Cl–  [CoCl3(NH3)3] + NH3 If in the above reaction only one isomer of the product is obtained, which is true for the initial (reactant) complex (A) compound is in cis form (B*) compound is in trans form (C) compound is in both (cis and trans) forms (D) can't be predicted Q.46 How many litres of benzene would be produced when 2.28 gm of phenyl magnesium iodide is treated with 112 cc of ethyne at STP. (A) 0.112 lt. (B) 0.228 lt (C) 0.056 lt. (D*) 0.224 lt. Q.47  4 MnO is of intense pink colour, though Mn is in (+7) oxidation state, it is due to (A) Oxygen gives colour to it (B) Charge transfer when Mn (+7) gives its electron to oxygen & oxidise to Mn(+8) temporaily (C*) Charge transfer when oxygen gives its electron to Mn (+7) changing in Mn (+6) (D) none is correct explanation
• 5. Q.48 mole 1 I CH3     P Probable structure of P is: (A*) (B) (C) (D) Q.49 When ZnS and PbS minerals are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because (A) Pb(CN)2 is precipitated while no effect on ZnS (B) ZnS forms soluble complex Na2[Zn(CN)4] (C) PbS forms soluble complex Na2[Pb(CN)4] (D) They cannot be separated by adding NaCN. Q.50 Arrange in order of enolic contains (a) (b) (c) (d) (A*) c > d > b > a (B) d > c > a > b (C) a > c> d > b (D) b > c > a > d