IIT-JEE AIPMT AIEEE OLYMPIADS KVPY NTSE. Time : 90 min. Maximum Marks : 50

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1 IIT-JEE AIPMT AIEEE OLYMPIADS VPY NTSE PCCP FACULTY SAMPLE TEST PAPER SUBJECT : CHEMISTRY OBJECTIVE-PAPER Time : 90 min. Maximum Marks : 50 GENERAL INSTRUCTIONS. Blank papers, clip boards, log tables, slide rule, calculators, mobile or any other electronic gadgets in any form is not allowed. 2. Write your Name in the space provided in the bottom of this booklet. 3. Each correct answer carries mark and each wrong answer /3 marks. 4. In case of any dispute, the answer filled in the OMR sheet available with the institute shall be final. 5. After completion submit the Question Paper back along with the Answer Sheet. 6. The Paper contains 50 quesitons. 7. All the questions are compulsory. Name : Roll No. : PCCP Head Office / Talwandi Campus : Address : C-8, Lakshya, Nursery Plots, Talwandi, ota (Rajasthan) Contact. No. : , , Fax : Website : pccp@resonance.ac.in

2 OBJECTIVE PAPER. The amount of energy released when 0 6 atoms of iodine in vapour state are converted to I ions is J. What is the electron affinity of iodine in ev per atom? (A) 2.0 (B) 2.5 (C) 2.75 (D) The ionic radius of Cr is minimum in which of the following species? (A) CrF 3 (B) CrO 3 (C) Cr 2 O 3 (D) 2 CrO 4 3. NO 2 and N 2 O 4 are two forms of nitrogen dioxide. One exists in gaseous state while other in liquid state. The nature of two forms are - (A) both are paramagnetic (B) both are diamagnetic (C) NO 2 is paramagnetic while N 2 O 4 is diamagnetic (D) NO 2 is diamagnetic while N 2 O 4 is paramagnetic 4. The formal charge of the O-atoms in the ion O N O (A) 2 (B) (C) 0 (D) is - 5. Zone refining is based on the principle of - (A) fractional distillation (C) fractional crystallisation 6. Among the following, the incorrect statement is - (A) Argentite and cuprite are oxide ores. (C) Zinc blende and pyrites are sulphides. (B) partition coefficient (D) chromatographic separation (B) Calamine and azurite are carbonates. (D) Malachite and azurite are ores of copper. 7. Zinc on reaction with NaOH gives a salt (A) along with a gas (X) and (A) on reaction with a gas (Y) gives white precipitate (W). Which of the following is correct? (A) (A) is Na 4 ZnO, (Y) is H 2 S (B) (X) is H 2, (W) is Zn(OH) 2 (C) (A) isna 2 ZnO 2, (X) is O 2 (D) (W) is ZnS, (X) is H 2 PAGE #

3 8. When sodium reacts with excess of oxygen, oxidation number of oxygen changes from - (A) 0 to (B) 0 to 2 (C) to 2 (D) to 9. Which disproportionates on heating with NaOH? (A) P 4 (B) S (C) Cl 2 (D) All of these 0. On heating a mixture containing mole each of Li 2 CO 3 and 2 CO is/are formed. (A) 2 moles of CO 2 (B) mole of CO 2 (C).5 moles of CO 2 (D) no carbon dioxide. Identify the correct statement : (A) The percentage of calcium is lower in gypsum in comparison to plaster of paris. (B) Gypsum is not a natural product. It is obtained by heating of plaster of paris. (C) Plaster of paris is obtained by hydration of gypsum. (D) Plaster of paris is formed by oxidation of gypsum. 2. A sodium salt on treatment with MgCl 2 gives white precipitate on heating. The anion of the sodium salt is- 2 2 (A) HCO 3 (B) CO 3 (C) SO 4 (D) NO 3 3. How many moles of electron weigh one kilogram? (A) (B) (C) (D) Match (X) with (Y) and select the correct alternative. (X) (Y) (a) Sorrel cement CaH 2 (b) Anhydrone 2. BaSO 4 ZnS (c) Hydrolith 3. MgCl 2. 5MgO. xh 2 O (d) Lithopone 4. Mg(ClO 4 ) 2 (a) (b) (c) (d) (a) (b) (c) (d) (A) (B) (C) (D) PAGE # 2

4 5. Loschmidt number is the number of - (A) molecules present in ml of a gas at STP. (B) molecules present in mole of a gas at STP. (C) atoms present in ml of a gas at STP. (D) atoms present in mole of a gas at STP. 6. The molar ratio of Fe 2 to Fe 3 in a mixture of FeSO 4 and Fe 2 (SO 4 ) 3 having equal number of sulphate ions in both ferrous and ferric sulphates is - (A) : 2 (B) 3 : 2 (C) 2 : 3 (D) None of these 7. Which one of the following represents an impossible arrangement? n m s n m s (A) 3 2 /2 (B) /2 (C) /2 (D) /2 8. When a hydrogen atom emits a photon of energy 2. ev, the orbital angular momentum changes by- (A) J sec (B) J sec (C) J sec (D) J sec 9. Molarity of H 2 SO 4 (density.8g/ml) is 8M. The molality of this solution is - (A)36 (B) 200 (C) 500 (D) Which concentrations can be calculated if the mole fraction and density of an aqueous solution of HCl are known?. Molality 2. Molarity 3. Percentage by mass (A) only (B) 3 only (C) and 2 only (D), 2 and 3 2. An electrolytic cell contains a solution of Ag 2 SO 4 and has platinum electrodes. A current is passed untill.6 g of O 2 has been liberated at anode. The amount of silver deposited at cathode will be - (A) 08 g (B).6 g (C) 0.8 g (D) 2.06 g 22. Chlorine acts as a bleaching agent only in presence of - (A) dry air (B) moisture (C) sunlight (D) pure oxygen 23. The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order - 2 CO 3 (I), MgO (II), CaCO 3 (III), BeCO 3 (IV) (A) I < II < III < IV (B) IV < II < III < I (C) IV < II < I < III (D) II < IV < III < I PAGE # 3

5 24. Which of the following statements is true? (A) H 3 PO 3 is a stronger acid than H 2 SO 3. (B) An aqueous solution of HF is stronger acid than HCl. (C) HClO 4 is a weaker acid than HClO 3. (D) HNO 3 is a stronger acid than HNO Molecular shapes of SF 4, CF 4 and XeF 4 are : (A) the same, with 2,0 and lone pair of electron respectively. (B) the same, with, and lone pair of electron respectively (C) different with 0, and 2 lone pair of electron respectively. (D) different with,0 and 2 lone pair of electrons respectively. 26. The hybridisation of atomic orbitals of N in NO 2, NO 3 and NH 4 are respectively : (A) sp, sp 2, sp 3 (B) sp, sp 3, sp 2 (C) sp 2, sp, sp 3 (D) sp 2, sp 3, sp 27. Which of the following has the smallest bond length? (A) NO (B) NO (C) NO (D) equal 28. Equilibrium constant and 2 for the following equilibria : NO(g) 2 O 2 NO 2 (g) and 2NO 2 (g) 2NO(g) O 2 (g) are realted as : (A) = 2 (B) 2 = (C) 2 = 2 (D) = Consider the following statements -. The rate of reaction is always proportional to the concentrations of reactants. 2. The order of an elementary chemical reaction step can be determined by examining its stoichiometry. 3. The first order reactions follow an exponential time course. Among these statements (A), 2 and 3 are correct (B) and 2 are correct (C) 2 and 3 are correct (D) and 3 are correct 30. What will be the ph of a solution formed by mixing 40 cm 3 of 0. M HCl with 0 cm 3 of 0.45 M NaOH? (A) 0 (B) 8 (C) 5 (D) 2 3. In the Lassaigne s test for the detection of nitrogen, the blue or green colouration is due to formation of: (A) 4 [Fe(CN) 6 ] (B) Fe 3 [Fe(CN) 6 ] 2 (C) Fe 4 [Fe(CN) 6 ] 3 (D) Fe(CN) 2 2 PAGE # 4

6 32. Which of the following triad of group activates the benzene ring and directs the electrophile to o- and p- position for substitution? (A) NO 2, CHO, COOH (B) OH, O, CH 3 (C) OH, SO 2 OH, NO 2 (D) NH 2, CHO, SO 2 OH 33. Water insoluble aromatic compound dissolves in sodium hydroxide but remain insoluble in sodium bicarbonate. Hence the expected compound should be : (A) -COOH (B) OH (C) CO CH 3 (D) NH The compound represented by the molecular formula C 7 H 8 O are : (A) Only alcohol (C) Only phenolic compound (B) Only ether (D) All the three types of compounds 35. MnO 4 ozonolysis Functional groups Y, CH = CH 2 and X respectively are -----, and directing. (A) Meta, ortho - para and ortho - para (C) Meta, ortho - para and meta (B) Meta, meta and meta (D) All the three ortho - para 36. a values for isomeric chlorophenols are : (A) a (o) > a (m) > a (p) (C) a (m) > a (p) > a (o) (B) a (o) > a (p) > a (m) (D) a (p) > a (m) > a (o) 37. The pair of solid compound is : (A) Benzaldehyde, aniline (C) m-dinitrobenzene, benzoic acid (B) Nitrobenzene, benzene (D) All the above PAGE # 5

7 38. Match the thermodynamic properties (List-I) with their relation (List - II) (List -I) (List- II) (a) Free energy change ( Gº) (i) RT log e (b) Entropy changes ( Sº) (ii) nfe (c) Enthalpy change of a reaction dln in standard state ( Hº) (iii) RT 2 dt P (d) Standard free energy change ( Gº) d G (iv) dt Select the correct answer (a) (b) (c) (d) (a) (b) (c) (d) (A) (i) (ii) (iii) (iv) (B) (ii) (iv) (iii) (i) (C) (iv) (ii) (iii) (i) (D) (i) (ii) (iv) (iii) 39. Match List-I and List-II List-I (a) Degree of ionization of weak electrolytes increases List-II (b) ph of water decreases on (ii) ph = 4 (c) The solution has hydronium ion concentration of mol/litre (d) The addition of NaOH to Ca(OH) 2 P (i) Common ion effect (iii) Heating (iv) On dilution solution precipitates Ca(OH) 2 (a) (b) (c) (d) (A) (iv) (iii) (i) (ii) (B) (iii) (iv) (ii) (i) (C) (iv) (iii) (ii) (i) (D) (iv) (ii) (iii) (i) 40. Boric acid (H 3 BO 3 ) is dissolved in water H 3 BO 3 H 2 O B(OH) 4 H H 3 BO 3 acts as (A) Lewis acid (C) both as Lewis acid as well as Lewis base (B) Lewis base (D) None of these PAGE # 6

8 4. In Mond s process, CO(g) is passed over Ni(s) when volatile complex Ni(CO) 4 escapes. Ni(s) 4CO(g) Ni(CO) 4 (g) In this (A) Ni(s) is a Lewis base and CO(g) is a Lewis acid (B) Ni(s) a Lewis acid and CO(g) is a Lewis base (C) Ni(s) as well as CO(g) behaves as amphoteric (D) It is not Lewis acid-base reaction 42. Hydrated proton cannot be - (A) H 5 O 2 (B) H 9 O 4 (C) H 5 O 3 (D) H(H 2 O) n 43. In the mixture of concentrated H 2 SO 4 and HNO 3, intermediate formed is : (A) H 3 SO 4 (B) SO 4 2 (C) H 2 NO 3 (D) H 2 NO Amphoteric -oxide combination are in : (A) ZnO, 2 O, SO 3 (B) ZnO, P 2 O 5, Cl 2 O 7 (C) SnO 2, Al 2 O 3, ZnO (D) PbO 2, SnO 2, SO Delocalised molecular orbitals are found in : (A) H 2 (B) HS (C) CH 4 (D) CO Which of the following is an electron-deficient compound? (A) NaBH 4 (B) CO 2 (C) B 2 H 6 (D) Al 2 Cl Which of the following is non-polar but contains polar bonds? (A) HCl (B) H 2 O (C) SO 3 (D) NO The expected spin only magnetic moments (B.M.) for [Fe(CN) 6 ] 4 and [FeF 6 ] 3 respectively are : (A).73 and.73 (B).73 and 5.92 (C) 0.0 and.73 (D) 0.00 and When N 2 is formed from N 2 bond order and when O 2 is formed from O 2 bond-order (A) Increases (B) decreases (C) increases, decreases (D) decreases, increases 50. Which of the following have identical bond order? (I) CN (II) O 2 (III) NO (IV) CN (A) I, III (B) II, IV (C) I, II, III (D) I, IV PAGE # 7

Stoichiometry: Chemical Calculations. Chemistry is concerned with the properties and the interchange of matter by reaction i.e. structure and change.

Stoichiometry: Chemical Calculations. Chemistry is concerned with the properties and the interchange of matter by reaction i.e. structure and change. Chemistry is concerned with the properties and the interchange of matter by reaction i.e. structure and change. In order to do this, we need to be able to talk about numbers of atoms. The key concept is