General Questions and Answers

A gaseous mixture contains 5 6 g of carbon II oxide and rest carbon IV oxide when it is enclosed in a vessel of 10 dm at 298 K it recorded a pressure of 2 0 bar What is the partial pressure of each oxide of carbon

Statement I In Finkelstein reaction the solvent used is dry acetone Statement II Dry acetone precipitates the NaCl or NaBr formed in the reaction and thus the reaction proceeds in the forward direction In the light of the above statements choose the correct answer from the options given below Statement I is false but Statement II is true Both statements I and II are true Both statements I and II are false Statement is true but statement II is

3 Which of the following statements is false about gases At high temperature and low pressure the ideal gas behavior is followed At high pressure the volume of the real gas is less than the ideal gas volume At low temperature and moderate pressure the attractive forces between particles are dominant At high pressure the molecular distance between gas particles approaches molecular diameter so repulsive forces are dominar

31 Identify the correct statement for change of Gibbs energy for a system AG system at constant temperature and pressure AIPMT Prelims 2006 0 the process is spontaneous 0 the system has attaine 1 If AG system 2 If AG system equilibrium 3 If AG 0 the system is still moving system a particular direction 0 the process is no 4 If AG system

How many moles of ATP is obtained from the catabolism of 5g of a triglyceride made of a C16 fatty acid a C17 fatty acid and a C24 fatty acid Use the following molecular mass values for your calculations H 1g mol C 12g mol O 16g mol If you can also provide an explanation as to how to calculate how much water in Litres is produced that would be great

5 You have 15mL of a 0 3M solution of His Lys Leu Asp adjusted to pH 9 You titrate your solution with 10mL of 0 2M HCI Relevant pKa values are 2 1 3 8 6 0 9 8 and 10 5 a Draw the structure of the tetrapeptide that predominates in solution before you add any HCI 5 marks

A effervescent tablet containing sodium bicarbonate and oxalic acid releases 0 25 mL of CO2 at T 298 15 K and p 1 atm If molar volume of CO2 is 25 0 L under such condition what is the percentage of sodium bicarbonate in each tablet Molar mass of NaHCO3 84 g mol O O O O 8 4 0 84 16 8 33 6

Question 3 Let 21 and 22 be the complex roots of ax 2 bx c 0 where a b c 0 Then A 21 22 1 B 121 22 2 1211 1221 1 None of these Question 8 Let 21 and 22 be two roots of the equation 2 az b 0 z being complex Further assume that the origin 21 and 21 form an equilateral triangle Then a b a 2b 1 Point a 3b 1 Poin

Isobutyl bromide on reaction with alc KOH followed by reaction with HBr gives Br Br x Br Br

Nitrogen and oxygen react to form nitric oxide NO All substances are in the gas phase If 0 473 atm of nitrogen and 0 416 atm of oxygen react what is the partial pressure of nitric oxide in mmHg when this reaction goes 64 complete The temperature and volume are constant

K water 1 86 K kg mol The temperature at which ice begins to separate from a mixture of 10 mass ethylene glycol is A 1 86 C B 3 72 C D 3 C 40410 R 5 fe 59 6 34 23 20 K 1 86 K kg mol A 1 86 C B 3 72 C 3 3 C D 3 C

Which of the following statement s is are correct Pot Tetracyanocuperate I tetrahedral complex Sod Tetracyanonickelate II is a square planar complex Pot Tetrachloridopatinate II is a tetrahedral complex Tetraamminecopper II sulphate is a squa

Which of the following will give a tertiary alcohol as product if reacting with C H5MgBr followed by hydrolysis HCHO CH3CHO min sec OLIO

The following reaction is an example of 4NH3 g 50 g 4NO g 6H O g i displacement reaction iii redox reaction a i and iv c iii and iv ii combustion reaction iv neutralisation reaction b ii and iii d i and ii

27 Arrange the following compounds in the increasing order of their melting points Cl CI Cl I Cl a I II III c II CI b III 1 11 d CI 2 III

CH CH C CH Hg OAc NaBHA O O O B H6 H O OH D Relation between A and B C and D are Position chain Position Functional Chain Identical C Matamor L CH CH CH CH HBr CC A HBr R 0 B

A solution contains 0 100 M Ce 1 00 x 10 4 M Ce4 1 00 x 10 4 M Mn 0 100 M MnO4 and 1 00 HCIO4 For the following cell reaction calculate E and AG at the given conditions 5C e4 aq Mn aq 4H 0 1 0 193 V and 93 1 kJ 0 23 V and 111 kJ 0 02 V and 10 kJ 0 02 V and 10 kJ 5Ce aq MnO4 aq 8H aq

Sachin was suffering from problem of he visited a physician who advised him to take 0 025 dm of milk of magnesia for a fast relief He exactly followed what the doctor told him to do Out of curiosity he saw the label on milk of magnesia bottle and he found that there were different ingredients written on it and the concentration of milk of magnesia mentioned was 29 ppm Assuming the volume of milk of magnesia required for neutralization of acid is equal to intake of milk of magnesia help Sachin to find out the following How many moles of acid was produced in Sachin s stomach i M Write down the neutralization reaction of this process Mg OH 2HCl MgCl 24 2728 iii Calculate the concentration of acid produced in mol dm

Benzene diazonium chloride C H N C1 was decomposed in the presence of hypophosphorous acid and the nitrogen evolved after drying was found to be 36 9 ml at one atmosphere and 27 C The amount of salt taken must be nearly 481 mg 210mg 1 3 2 240mg 4 140 mg found to contain 40 mg Cat2

2 gm of a coal sample was heated at 120 C for one hour and residue weighed 1 815 gm Further the sample was heated at 950 C for 8 minutes The residue weighed 0 998 gm Finally the sample was heated at 750 C for 30 minutes and residue left was 0 512 gm Calculate percentage of moisture volatile matter fixed carbon and ash in the coal sample

One half cell in a voltaic cell is constructed from a silver wire electrode in a 0 10 M solution of AgNO3 The other half cell consists of a zinc electrode in a 0 025 M solution of Zn NO3 2 Calculate the cell potential E 0 763 V E Zn Zn Ag Ag 0 799 V

a Cs most metallic non radioactive element H e Mniimum atomic radius b Halogens p block alkali metals s block c Fluorine maximum ve electron gain enthalp y lodine minimum ve electron gain enthalpy

43 5 ml of 0 1 M Pb NO3 is mixed with 10 m of 0 02 M KI The amount of Pbl precipitated will be about B 10 4 mol 10 9 KG A 10 2 mol 5 ff 0 1 M Pb NO3 Phl A 10 mol G 24 G B 10 mol C 2x 10 mol 0 02 M KI 4 C 2 x 10 mol D 10 3 mol 431 26 AGRIG SKA D 10 mol

1 Through the reaction of zinc plus aqueous hydrochloric acid on a day when the temperature was 29 C and barometric pressure was 750 0 mm Hg 2 5 grams of hydrogen gas were collected over water What was the partial pressure of water in the collection flask A 30 7 atm B 15 4 atm C 0 95 atm D 0 039 atm E none of the above

out of these LiCl has the highest lattice en ergy According to fajan s rule LiCI has the highe st covalent character But Ionic Character is directly proportional to lattice energy If LiCl has highest lattice e nergy shouldn t it have highest ionic charac ter

e t How many in the following are poor conductor of electricity Lemon juice Tap water Vinegar Distilled water Vegetable oil Sugar solution Milk Honey Soap solution Four 1 2 Five

3 3 S How much volume of HC1 43 by mass and specific gravity 0 9125 is required to completely neutralize 500 ml of 0 5N NaOH solution 1 25 ml 3 250 ml 50 ml of 2M H SO4 is titrated with 2 4 2 per mole to chloride and The remaining NaOH i ml of 0 1 N equil 4 23 25 ml 1250 ml

21 The dissociation energy of CH4 g is 360 kcal mo and that of C H6 g is 620 kcal mol 1 The C bond energy is 1 260 kcal mol 1 3 130 kcal mol 1 2 180 kcal mol 1 4 80 kcal mol 1

PART A Determination of Optimal Wavelength Wavelength nm Absorbance A 430 450 470 490 510 530 550 570 0 159 0 243 0 320 0 358 0 421 0 450 0 467 0 480 590 0 439

1 The solubility of salicylic acid in water is 7 8g 100ml at 100 C and 0 25g 100ml at 25 Estimate how much water is needed to recrystallize a 19g sample of salicylic acid A 150ml B 250ml C 300ml D 400ml

Cations Nati Nall Sodium Sodium Chlorida K 1 Potassium Cu 2 Copper Mg 2 Magnesim Ca 2 Calcium NH Ammonium 1 Ag Silver Chloride Al 3 luminium Oxide K 0 Potassium Oxide Sul sulphide Cu S Copper Sulphide Hydroxide Mg OH Magnesium 11 Hydrosude Nitrate Ca NO3 2 Calciumitrato Carbonate NH CO Ammonium Corborat S04 Sulphate POL Ag 504 Silver Sulphate Phosphate Alpon Aluminium Phosphate

2 From the following reactions determine which one represents a standard enthalpy of formation AH KCI s a K g Ch g b Mg s O g MgO s c CO g O2 g CO g d C s 2 H g CH4 g

For the reaction A g 2B g C g D g K A B dt nitial pressure of A and B are respectively 0 60 atm and 0 80 atm At a time when pressure of C is 0 20 atm rate of the reaction relative to the initial rate is A C 1 6 1 4 B D 1 48 1 24

5 How many grams of water would there be in 100 0 g of hydrate How many moles mass of water in 100 0 g of hydrate moles of water in 100 0 g of hydrate 6 How many grams of CuCl are there mass of CuCl in 100 0 g of hydrate 100 0 g of hydrate How many moles

In the reaction P g 2 Q g 4 R g 3 S I When 1 mole of P and 1 mole of Q are allowed to react to the completion of reaction then O All P will be consumed O 4 mole of R will form O 2 mole of S will form O All Q will consumed

Example 5 21 A toy balloon blown up at 5 C has a volume of 480 mL At this stage the balloon is distended to 7 8th of its maximum stretching capacity a Will the balloon burst if it is brought to a room having temperature at 30 C b Calculate the temperature at which the balloon will burst

An ideal gas expands adiabatically against vacuum Which of the following is correct for the given process A AS 0 B AT ve 4 C CLAPEN A AS 0 B AT ve C AU 0 D AP 0 OG Age Refool XXI HERI C AU 0 D AP 0

2 Paragraph a N O g 3H g H O N H4 AH 76kcal b 4N g 3H O l 2NH3 g 3N O g AH 240 kcal c N H4 H O 2NH3 g 1 20 g AH 36 kcal d H O H g 1 20 g AH 68 kcal The enthalpy of formation in kcal mol of liquid N H4 is wer e Here er your answer here Back Space

Calculate the partition coefficient for the analyte when an unretained solute passes through a chromatography column in 3 7 min and analyte requires 8 4 min Assume the volume of mobile phase is 1 4 times than volume of stationary phase A 1 5 B 1 8 C 1 7 20

Two identical ideal gas samples an expanded from P V T to P by tw different processes 1 Reversible isothermal process II Reversible adiabatic process Identify correct option s W work done W I W II AU I AU II T 1 T II V I V II

A system with charge no of electrons involved n is placed in an electric field with potential E volts Express the general form derivative expression with all the terms of Gibbs free energy function 5 pts

6 7 Calculate the millimoles of Br produc 2 One gm of impure sodium carbonate is dissolved in water and the solution is made up to 250 ml 50 ml of this made up solution 50 ml of 0 1N HCI is added and the mix after shaking well requ 10 ml of 0 16 N NaOH solution for complete titration Calculate the purity of the sample imal places till you get the single digit answ

On heating copper sulphate crystals blue at a very high temperature it changes to white coloured substance X Number of water molecules lost by one formula unit of copper sulphate during heating is

this sample of CuSO solution Molar mass of CuSO4 5H O 250 g mol liberated on addition of excess KI to CuSO solution What is the mass of CuSO 5H O in 250 ml of ml Na S O3 solution of 0 01 M requires 18 ml CuSO solution at the end point of titration with 1 a 2Cu 41 Cu I I 4 b I 2S O 21 S40 1 2 77 g 2 1 11 g 3 0 52 g 4 4 0 69 g

For the first order parallel reactions starting with 1 M of A which of the followin statement s is are correct A B A2K2C AK 3D A B C D is independent of time B C B D t C C 0 67 M

1 Calculate the moles of 2 nitrobenzaldehyde and acetone 2 Nitrobenzaldehyde 0 5 g MW 151 12 g mol Acetone 5 mL MW 58 08 g mol d 0 785 g mL 2 Why is so much acetone used in this reaction Synthesis of Indigo

A 2 L flask containing nitrogen at 60 cm pressure is put into a communication with 4 L flask containing carbon monoxide at 48 cm pressure If the temperature is kept constant Calculate the final pressure of the mixture

Beaker A and B both contain 100 g of sol ution beaker A contains 28 g of solute X whereas beaker B contains 46 g of solute Y If after a long time beaker B was found to have a mass of 109 g then find the molar mass of X in g mol if the molar mass of Y is 23 g mol Assume only solutes are non v olatile and solvent is water

aken as zero therefore If 150 kJ of energy is needed for muscular work to walk a distance of one km then how much of glucose one has to consume to walk a distance of 5 km Provided only 30 energy is available for muscular work The enthalpy of combustion of glucose is 3000 kJ mot Energy consumed for walking a distance of 5 km 150

of acetic Consider the titrimetric determination acid 60 05 g mol in vinegar Titration of a 5 00 mL vinegar sample requires 16 15 mL of 0 250 M NaOH to reach the phenolphthalein endpoint Which is TRUE when the endpoint is over run Choose from the following choices below A Acetic acid is in excess B Sodium hydroxide is in excess C Acetic acid and sodium hydroxide are of equal amounts D Cannot be determined