General Questions and Answers

KMnO is a good oxidising agent and commonly used to estimate many compounds 400 m KMnO solution was divided in two parts 3 4 part of solution was completely reacted w 200 ml of H O solution and remaining 1 4 part was completely reacted with 200 ml of 50 H C O solution both in acidic medium X If molarity of KMnO is X then find the value of

A sample of hydrogen peroxide solution has a mass of 4 599 g After reacting with the enzyme solution the moles of oxygen are 0 00284 moles What is the percent hydrogen peroxide in the solution

1 A mixture of NH4NO3 and NH4 2HPO4 contain 30 40 mass per cent of nitrogen What is the mass ratio of the two components in the mixture 1 2 1 2 1 2 3 3 4 4 4 1 2 A metal M forms the sulphate M SO4 3 A 0 596 gram sample of the sulphate reacts with excess BaCl to give 1 220 g BaSO4 What is the atomic weight of M Atomic weights S 32 Ba 137 3 1 26 9 2 69 7 3 55 8 4 23 3 SO Cl sulphuryl chloride reacts with water to given a mixture of H SO4 and HCl What volume of 0 2 M Ba OH is needed to completely neutralize 25 mL of 0 2 M SO Cl solution 1 25 mL 2 50 mL 3 100 mL 4 200 mL 100 cm of a solution of an acid Molar mass 98 containing 29 4 g of the acid per litre were completely neutralized by 90 0 cm of aq NaOH containing 20 g of NaOH per 500 cm The basicity of the acid is 1 3 2 2 3 1 4 data insufficient 5 A gaseous compound is composed of 85 7 by mass carbon and 14 3 by mass hydrogen It s density is 2 28 g litre at 300 K and 1 0 atm pressure Determine the molecular formula of the compound 1 C H 2 C H4 3 C4H8 4 C4H10 6 When 22 4L of H g is mixed with 11 2L of Cl g each at STP the moles of HCl g formed is equal to a 1 mole of HCl g b 2 moles of HCl g c 0 5 mole of HCl g d 1 5 moles of HCl g 7 1 c c of N 0 at NTP contains 1 10 2 atoms 6 02 x 1023 molecules 22400 3 10 electrons 4 All the above 8 What is the number of moles of O atom in 126 amu of HNO3 1 2 2 3 6 6 The number of gram molecules of oxygen in 6 02 102 4 CO molecules is 1 10 gm molecules 2 5 gm molecules 3 1 gm molecules 4 0 5 gm molecules 10 The haemoglobin from the red blood corpuscles of most mammals contains approximately 0 33 of

60 A schematic representation of enthalpy changes for the 60 1 C graphite O g CO g reaction is given below The 2 missing value is Cgraphite O g 393 5 KJ 1 10 5 kJ 2 11 5 kJ 3 110 5 kJ 4 10 5 J CO g CO g 1 O g 283 0kJ CA C graphite f fi fu Cgraphite O g 393 5 KJ 1 10 5 kJ 2 11 5 kJ 3 110 5 kJ 4 10 5 J 1 0 g CO g fay tri urada f CO g 2 CO g 1 O g 283 0kJ 153 15ml f

c The standard enthalpy of formation of O g is 249 kJ mol Calculate the wavelength in nm of the electromagnetic radiation with the minimum amoun of energy required for dissociation of one molecule of oxygen gas 9

A metal M forms the sulphate M SO4 3 A 0 596 gram sample of the sulphate reacts with excess BaCl to give 1 220 g BaSO4 What is the atomic weight of M Atomic weights S 32 Ba 137 3 1 26 9 2 69 7 3 55 8 4 23

4 20 min 45 If A B C 0 and A B C 0 then angle between 45 a 2 has 4 A and B A 6 2 0 P 1 cos 3 sin 1 A B 2024 A B 2 cos B 1 1 4 sin A B 1 0 B A

66 Choose the incorrect statement 1 Number of formula units in rocksalt structure is 4 2 Number of formula units in CsCl structure is 1 3 Number of formula units in sphalerite is 2 4 Co ordination number of fluoride ion in fluorite type structure is 4

Identify the CORRECT statement below about the diaphragm process O a The cathode is made of steel O b Both compartments have caustic soda flowing into them OC It is very costly regarding to electricity consumption Od Chlorine is produced at the cathode

What would be the entropy change involved in 86 25 C 234 235 thermodynamic expansion of 2 moles of gas from a volume of 2 L to a volume of 20 L at 25 C Given R 8 3 J mole K 1 38 23 J K 2 26 76 J K 3 20 J K 4 28 23 J K 3 wor mcort R 8 35 m 1 na he afe fea R 8 3 J mole K 1 38 23 J K 2 26 76 J K 3 20 J K 4 28 23 J K

F is produced by the given unbalanced equation How many grams of F is produced if 1 024 mol of SbF5 is reacted K MnF6 SbF5 KSbF6 MnF3 F Your answer O 19 5 g O29 3 g 38 9 g O 9 73 g

430 36 4 57 56 48 The potential energy of an electron in Het is 6 8 eV The 48 Het 3 6 8 V13E electron is present in which excited state 1 1st 2 2nd 4 3rd 68207 6 880 3 4th 3and a proton are accelerated by the same potential n en Libe 1 1st 3 4th B 1 2 2nd 4 3rd

59 Which of the following set of quantum numbers represents 59 f 24 tielle fall v the highest energy of an atom 1 n 3 1 0 m 0 s 2 2 n 3 1 1 m 1 s 1 3 n 3 1 2 m 1 s 2 1 1 4 n 4 1 0 m 0 s 2 1 1 1 213 1 n 3 1 0 m 0 s 1 2 n 3 1 1 m 1 s 2 1 3 n 3 1 2 m 1 s 2 1 4 n 4 1 0 m 0 s

66 Forl2 2e 21 standard reduction potential 0 54 volt For 2Br Br2 2e oxidation oxidation potential 0 44 volt Which of the following potential 1 09 volt For Fe Fe 2e standard reactions is non spontaneous a Br 212Br 12 b Fe Br2 c Fe 12 2 2 2Br Fe Fe 21 Fe2 Br 21 Br standard 2 72 A

0 NaCl forms an ionic crystal in which CI ions form C C P lattice The number of Na ions present at 5 A a distance of from CI ion at the corner is 2 Here A is the edge length of crystal 24

One mole each of two ideal gases are allowed to mix isothermally at 300 K and at a constant total pressure If the mixture also behaves like an ideal gas then the change in Helmholtz free energy AmbA in J of the process is a 3458 O b 1729 Oc 1729 O d 3458

4 2p q 5t 8s 4t 67 Enthalpy of formation of NH is X KJ and ABD HH HAB D HN are respectively Y kJ mol and Z kJ mol The value of is H AB D NEN DB D 1 Y 6Z N t3 Jenis 2 3Y 6Z 2X 3 3Y 6Z X 4 Y 6X Z X 3 3 4p 2q 5r 8s 4t 4 2p q 5t 8s 4t 67 NH XKJ ABD HHAB D HN H Y kJ mol 72IT Z kJ molla A D HN i HTC N N 1 Y 6Z X 3 3 3Y 6Z X 2 3Y 6Z 2X 4 Y 6X Z sh

The total pressure exerted by an ideal binary mixture of A and B is Given P 40 mm Hg P 80 mm Hg and mole fraction of A in vapour phase is 120 mm Hg 60 mm Hg 200 3 160 3 mm Hg mm Hg

reac 1 AH 0 and AS 0 2 AH 0 and 4S 0 3 AH 0 and AS 0 4 AH 0 and AS 0 65 Which statment is correct 3 dH dT dH dE dV dE dE R for ideal gas is zero 4 All of these The enthalpy of reaction 65 2 AH 0 FT AS 0 3 AH 0 72 AS 0 4 AH 0 AS 0 1 dH 3 4 66 3f4f41 dE dE dT V g R dE dV T

66 The enthalpy of reaction 2HC CH 50 4CO 2H O If the bond energies of C H C C O 0 C 0 and 0 H bonda are p q r s and t respectively 1 8s 4t 4p q 5r 2 4p 2q 5r 8s 4t 3 4p 2q 5r 8s 4t 4 2p q 5t 8s 4t 7 Enthalpy of formation of NH is XKJ and H H 66 3 67 2HC CH 50 4CO 2H O CH C C O OCO 1 8s 4t 4p q 5r 2 4p 2q 5r 8s 4t 3 4p 2q 5r 8s 4t 4 2p q 5t 8s 4t NH G

Select the incorrect statement from the following options Natural cement possesses hydraulic qualities O Cement can be defined as inorganic material having adhesive and cohesive properties a b C O Cement is obtained by burning calcareous and argillaceous materials d Natural cement can be obtained by burning clay rich with ipsum

Which of the following is not a colligative property Vapour pressure Osmotic pressure Depression in freezing point Elevation in boiling point hr

The correct order of solubility of He CO and O in water at 298 K and 1 atm is He 0 CO2 02 CO He CO O He CO He 0

32 A mixture of 2 3 g formic acid and 4 5 g oxalic acid is treated with conc H SO4 The evolved gaseous mixture is passed through KOH pellets Weight in g of the remaining product at STP will be 1 1 4 2 3 0 3 2 8 4 4 4

107 g of a ammonium chloride sample decomposes on heating to give HCI g and 25 5 g of NH3 g The percentag purity of ammonium chloride sample is 81 78 95 21 75

Br 2 4 N N NH neet prep Organic chemistry Differentiation and conversion 18th October Contact Number 9667591930 8527521718 NHOH Zn NH C Consider the following reaction ethanol PBr alc KOH i H SO room temperature ii H O heat X Y the product Z is 1 CH CH 2 CH3CH O CH CH3 3 CH3 CH O SO3H 4 CH CH OH 11 Page 1 2 methyl 2 butene 2 3 methyl 1 butene Z Which of the compounds with molecular formula C H10 yields acetone on ozonolysis

72 Which of the following complex is not correctly matched with its geometry 1 NiCl Ph P tetrahedral 2 Co Py 1 square planar 3 Cu CN tetrahedral 4 Fe CO square planar

One gram of silver gets distributed between 10cm of molten zinc and 100cm of molten lead at 800 C The percentage of silver still left in the lead layer is approxiamtely A 94 B 97 C 69

30 The magnetic moments of complexes given below are in 30 fa the order 1 Ni CO II Mn CN III Cr NH 1 IV CoF 1 1 I II III I 2 I III N 3 N II I III 4 N II I III of Pt 31

If the heat of solution for one mole of KCI in 20 moles of water and 200 moles of water are 3 80 kcal and 4 40 kcal respectively then the heat of dilution is O 8 20 kcal 8 2 kcal 0 60 kcal 0 60 kcal

c 1 3 d 1 1 55 A hydrogen electrode placed in a buffer solution of CH3COONa and acetic acid in the ratio s x y and y x has electrode potential values E volt and E2 volt respectively at 25 C The pKa values of acetic acid is E and E are oxidation potential E E b 0 118 c 2212 E E2 0 118 E2 E1 0 118 E E2 0 118 d E fo a b d 63 Sil 0 1 H

Pressure exerted by vapours above the surface of liquid in liquid gas equilibrium depends on Temperature Surface area Nature of liquid Both 1 and 3

A compound formed by elements X and Y has a cubic structure in which X atoms are at the corner of the cube and two atoms Y are at each body diagonal of the cube If all atoms from one body diagonal of the cube are removed then formula of the compound is A XY B XY3 C XY D XYg

24 How many grams of 70 by weight concentrated nitric acid solution should be used to prepare 250 mL of 2 0 M HNO3 1 54 0 g conc HNO3 2 45 0 g conc HNO3 3 90 0 g conc HNO3 4 70 0 g conc HNO3

The total number of protons in 10g of calcium carbonate is No 6 023x10 23 Quizz 9 1 5057x10 24 23 2 0478x10 24 X 45 3 0115x10 24 14 4 0956x10 24 9 None of these

Two reactions I A Products II B Products follow first order kinetics The rate reaction I is doubled when the temperature is raised from 300 K to 310K The half life for this reaction at 310K is 30min At the same temperature B decomposes twice as fast as A If the energy of activation for reaction I is twice that of reaction II calculate the rate constant of reaction II at 300K

28 20 g of magnesium carbnate sample decomposes on heating to give carbon dioxide and 8 0 g magnesium oxid What will be the percentage purity of magnesium carbonate in the sample At Wt Mg 24 1 60 2 84 3 75 4 96

Copper 1 sulfate is produced when copper is heated with sulfur If 1 5 g of Cu was heated with an excess of sulfur to yield 1 76 g of Cu2SO4 what is the yield for this reaction 75 98

ilic A hydrocarbon has molecular formula C8H12 In this hydrocarbon only one H molecule can be added On ozonolysis it gives symmetrical diketone The hydrocarbon is 1 2 3 CH CH

CAREER 63 Wavelength of a light beam is 25 m Its wave number is 63 25 m 1 4 0 x 10 cm 1 14 2 4 0 x 106 cm 1 3 4 0 x 106 m 1 4 25 0 104 cm 1 4 0 x 10 cm 1 2 4 0 x 106 cm 1 3 4 0 x 106 m 1 4 25 0 x 104 cm 1 D 1 25X 0 104x10

Which of the following complex is an outer orbital complex 36 Fertighar para tigh outer orbital comp x TOK 4 Cr CO Mn CO V CO Sc Ti V Cr 25 1 Ni NH3 2 Mn CN 3 Co NH 6 3 4 Fe CN d 8 21 ALALALA 2 2 d g2 721 2 1 Ni NH3 2 Mn CN 6 3 CO NH 1 d7 4 Fe CN de 1272 22 1 1 d 2229499 12121212 1 Al

3 All the metal ions contains te configurations Which of 73 the following complex will be paramagnetic 1 FeCi CN 0 2 K Fe CN 3 Co NH CI 4 Fe CN 0 1 5

In the following reaction which choice has value twice that of the equivalent mass of the oxidising agent SO2 H20 3S H20 Quiz AB 15 64 33 32 33 16

42 The acid catalysed hydrolysis of an organic compound A at 30 C has a time for half change of 100 min when carried out in a buffer solution at pH 5 and 10 min when carried out at pH 4 Both times o half change are independent of the initial concentration of If the rate constant K is given by Ch d A dt A a 1 b 1 K A H what are the values of a and b B a 2 b 1 C a 0 b 1 D a 1 c 0

The decomposition of dimethyl ether leads to the formation of CH4 H and CO and the reaction rate is given by Rate k CH OCH 1 2 The rate of reaction is followed by increase in pressure in a closed vessel so the rate can also be expressed in terms of the partial pressure of dimethyl ether i e Rate k PCH 0CH 2 If the pressure is measured in bar and time in minutes then what are the units of rate and rate constants

3 The density of an ideal gas A is 1 43 g L at STP Determine the density of A at 17 C and 700 torr mm 1 24 g L 4 A container has 3 2 g of a certain gas at NTP What would be the mass of the same gas contained in the same vessel at 200 C and 16 atm pressure 29 534 g Hint Mol wt M 3 2 x 22 4 V vol in lit Apply pV W RT M w wt of the gas in g at 473 K and 16 atm 5 Calculate the volume occupied hu C

6 The correct order of the lattice energies of th following ionic compounds is A NaCl MgBr2 CaO Al2O3 B NaCl CaO Mg Br Al O3 C Al2O3 MgBr2 CaO NaCl D MgBr2 Al2O3 CaO NaCl E Al2O3 CaO MgBr NaCl dical 200

An aqueous solution of 0 1 molal concentration of glucose should have freezing point k 1 86 K mol kg 0 186 C 1 86 C 0 186 C 1 86 C

What is the SI unit for heat Select an answer and submit For keyboard navigation use the up down arrow keys to select an answer a Gallons b Grams n d Joules Moles

The bond length and bond angles in the molecules of methane ammonia and water are given below C 0 109 nm 109 5 H 2 H H 0 104 5 N 0 101 nm K 107 H A 0 096 nm H H The variation in bond angle is a result of 1 The increasing repulsion between hydro gen atoms as the bond length decreases The number of non bonding electron pairs in the molecula