General Questions and Answers

mass 1 A solution is prepared by dissolving 0 6 g of urea molar 60 g mol and 1 8 g of glucose molar mass 180 g mol in 100 mL of water at 27 C The osmotic pressure of the solution is R 0 08206 L atm K mol 1 2019 Main 12 April II d 1 64 atm a 8 2 atm b 2 46 atm JETA 4 92 atm

The complex Fe H O 5 NO 12 is formed in the brown ring test for nitrates Choose the incorrect statement for the complex Question Type Single Correct Type 1 Its magnetic moment is approximately 3 9 B M 2 The oxidation state of iron is 1 3 The hybridisation of central metal ion is sp d

A white solid reacts with dil HCl to give colourless gas that decolourises aqueous bromine The solid is most likely to be sodium carbonate c sodium acetate b sodium chloride d sodium thiosulphate

17 The largest oxidation number exhibited by an element depends on its outer electronic configuration With which of the following outer electronic configurations the element will exhibit largest oxidation number a 3d 4s c 3d 4s of the following P b 3d 4s d 3d5 4s

Which order is correct about acidity 1 CH COOH C H COOH C H OH 3 C6H5OH C6H5COOH CH3COOH The molecule which does not exhibit dipole moment is DY MIL 2001 2 C6H COOH CH COOH C H OH 4 C6H5OH CH3COOH C6H5COOH BILO

4 Ethers are prepared by the reaction of sodium alkoxides and alkyl halides Which of the following reagents should be taken to prepare methyl tert butyl ether 1 CH C Br NaOCH 2 CH Br NaOC CH 3 CH CH Br NaOC CH 4 CH Br NaOCH CH

Be NO3 2 on heating to 125 C gives Answer A B C D Your Attempt BeO NO2 02 BeO NO Correct answer B 40 NO3 6 N205 BeO N 05

3 N Be C B In the formation of a chloride ion from an isolated gaseous chlorine atom 3 8 eV energy is releas would be equal to 1 Electron affinity of Cr 3 Electronegativity of Cl 2 Ionisation potential of Cl 4 Ionisation potential of Cr

The basic character or MgO BaO Na2O and FeO follow the order 1 MgO FeO BaO Na O 2 FeO MgO BaO Na O 3 FeO MgO BaO Na O 4 Na O MgO FeO BaO The compound formed in the positive test for nitrogen with the lassaigne solution of an orga compound is

7 How many numbers of molecules and atoms respectively are present in 2 8 litres of a diatomic gas at STP 1 6 023x10 7 5 10 3 2 6 023x10 15 10 2 3 7 5 102 15x10 4 15x10 7 5 10

9 1 6 g of an organic compound gave 2 6 g of magnesium pyrophosphate The percentage of phosphorus in the compound is 1 45 38 2 54 38 3 37 76 4 10 02

Identify the correct statement in relation with the following reaction Zn 2HCl ZnCl2 H Question Type Single Correct Type 1 Zn is acting as an oxidant 2 Chlorine is acting as an oxidant 3 Zn is acting as reductant

ons 107 Structure of the compound whose IUPAC name is 3 Ethyl 2 hydroxy 4 methylhex 3 en 5 ynoic acid is OH COOH 1 ed conc added to 2 3 OH OH OH COOH COOH COOH COOH

The amount of work done to increase the temperature of one mole of an ideal gas by 50 K if the gas is expanding under condition VT 23 constant R 831 mol K A 415 5J B 623 25 J C 277 D 601

he decomposition of N O5 in CCl4 is studied by monitoring the concentration of N2O5 in the solution Initially the oncentration of N O5 is 2 33 molL 1 and after 184 minutes it is reduced to 2 08 molL 1 The reaction takes place ccording to the reaction EN2O5 9 4NO2 g O2 g the average rate of this reaction is x x 10 2molL 1 hr 1 calculate x

43 Which of the following statement s is are false A A S for N g N g is positive 2 AG is always zero for a reversible process in a closed system system C AG for an ideal gas is a function of temperature and pressure D Entropy of a closed system is always maximized at equilibrium

Potassium metal is commercially prepared by the reduction of molten KCI with metallic sodium a 850 C This method is based upon the following principle Option A B C D Sodium is more reactive than potassium at this temperature Potassium being more volatile distills off thus shifting the reaction forward Sodium prefers to bind to chloride ions in preference to potassium ions Rate this e Potassium and sodium form an alloy at this temperature

One mole of one of the sodium salts listed below having carbon content close to 14 3 produces 1 mole of carbon dioxide atomic mass KVPY 2016 upon heating Na 23 H 1 C 12 0 16 The salt is a C H5COONa b NaHCO3 c HCOONa d CH3COONa

Question No 40 If the kinetic energy of electron in nth shell of H atom is K then its potential energy in nth shell will be O K K 2 O 2 K O 2K

A solution contains 0 001 M Pb2 and 0 001 M Agt What happens when KI s is added to bring I concentration to 0 0001 M Ksp Pbl 1x10 10 Ksp Agl 8 10 17 A Pbl2 selectively precipitates B Agl selectively precipitates C Both Pbl and Agl precipitate D Neither Pbl2 nor Agl precipitate

A straight glass tube has two inlets x and y at two ends The length of the tube is 200 cm HCl gas through inlet x and NH gas through inlet y are allowed to enter the tube at the same time White fumes first appear at a point P inside the tube Find the distance of P from x Sol According to Graham s law of diffusion

57 pk a H NCHCOOHH N CH COOH N CH COO R A 2 3 pk 9 7 a2 R B R C Which of the following statements is are correct A at pH 2 3 half of A is converted into B B at pH 6 B is at its maximum C at pH 6 the solution having the above equilibrium becomes non conducting D pH 9 7 is called isoelectric point

Atomic mass of magnesium is 24 amu it means that an atom of magnesium is 24 times heavier than one twelfth of mass of a carbon atom C 12 24 times heavier than the mass of a carbon atom C 12 4 times heavier than the mass of a carbon atom C 12 2 times heavier than one twelfth of mass of a carbon atom C 12

0 5 1 5 2 2 5 3 1 The volume of oxygen required for complete combustion of 20 ml of ethene is 1 30 ml 260 ml 3 40 ml 4 50 ml to produce the sufficient quantity of eart

How many moles of methane are required to produce 22 g of CO after combustion A 1 B 2 C 1 5 D 0 5 If in a voltmeter there are 20 divisions between 0 to 0 5 what is the least count of voltmeter A 0 025 C 0 25 B 0 05 D 0 002

On increasing the temperature the increase in conductivity of intrinsic semiconductor is due to A Decrease in band gap between valence band and conduction band B Increase in electrons in conduction band C Increase in negative charged electrons than positive holes in valence band D Increase in electrons in valence band

Which of the following reactions can be used to prepare acetophenone A Reaction of benzene with acetyl chloride in presence of anhydrous AlCl3 B Dry distillation of a mixture of calcium benzoate and calcium acetate C Oxidation of ethyl benzene by vanadium peroxide D By the action of CH3 2Cd on benzoyl chloride followed by acid hydrolysis

convert Question Type Single Correct Type 1 Infusible impurities to fusible material

The stability of the following alkali metal chlorides follows the order Option A B C D LICI KCI NaCl CsCl CsCl KCI NaCl LICI NaCl KCI LICI CsCl KCI CSCI NaCl LiCl

Volume of CO obtained at STP by the complete decompoisition of 9 85 g BaCO3 is At wt of Ba 137 1 2 24 lit 2 1 12 lit 3 0 84 lit 4 0 56 lit nd 3

Biological colloid is prevented from coagulating by which method A steric polymeric stabilisers only B electrostatic stabilisers only C D charged species bound to the surface only both steric polymeric and electrostatic stabilisers

Freundlich adsorption isotherm equation Question Type Single Correct Type X 1 m k p1 n n 1 2 3 4 E x E m kp1 n 1 kp1 n 0 1 X kp1 n 0 1

8 For He the electron is in orbit with energy equal to 3 4eV The azimuthal quantum number for that orbit is 2 and magnetic quantum number is 0 Then which of the following is are correct a The subshell is 4d b The number of angular nodes in it is 2 c The numbers of radial nodes in it is 3 d The nuclear charge experienced in n 4 is 2e less than that in n 1 where e is electi arge

147 Amount of A FeSO4 NH4 2SO4 6H O molar mass 392 g mol must be dissolved and diluted to OS 250 mL to prepare an aqueous solution of density 1 00 g mL i e 1 00 ppm Fe2 by weight is de 1 a 3 50x 10 3 g c 7 00x 10 3 b 1 75 10 3 g d 0 35 x 10 3 o

A cylinder of gas supplied by Bharat Petroleum is assumed to contain 14 kg of butane If a normal family requires 20 000 kJ of energy per day for cooking butane gas in the cylinder last for days AHc of C4H10 2658 kJ per mol Question Type Single Correct Type 1 15 2 20 3 50

A metal oxide is reduced by heating it in a steam of hydrogen It is found that after complete reduction 3 15 gm of the oxide yields 1 05 gm of the metal We may conclude that 1 Atomic weight of the metal is 4 3 Equivalent weight of the metal is 4 2 Equivalent weight of the metal is 8 4 Atomic weight of the metal is 8 ARLESTWENDO SAD

The concentration of hydroxyl ion in a solution left after mixing 100 mL of 0 1 M MgCl2 and 100 mL of 0 2 M NaOH Ksp of Mg OH 1 2 10 is 1 2 8 10 3 x 2 2 2 8 x 107 3 2 8 x 10 4 4 2 8 x 10 5

If 8g of a non electrolyte solute is dissolved in114 g of n octane to reduce its vapour pressure to 80 the molar mass in gmol of the solute is Given that molar mass of n octane is 114 gmol 40 CORRECT ANSWER 60

If a person in an elevator accelerating upwards with an acceleration of 2ms tosses a coin vertically upwards with a speed of 20ms then after how much time will the coin fall back in to his hand g 10ms A 5 55 S C 25 5 S IT 1 B 1 55S D 3 33 S if truo on nore

For a reaction 1 Ag O s 2Ag s O g 2 AH AS and T are 40 63 kJ mol 108 8 J K mol 373 4 K respectively Predict the feasibility of the reactio a feasible b non feasible

Strontium chloride and sodium fluoride react to form strontium fluoride and sodium chloride according to the reaction shown SrCl aq 2 NaF aq SrF s 2 NaCl aq What volume of a 0 210 M NaF solution is required to react completely with 275 ml of a 0 200 M SrCl solution volume How many moles of SrF are formed from this reaction m mo

Identify the correct statement from the following The order of hydration enthalpies of alkaline earth cations 2 2 Be2 Mg2 Ca Sr Ba Lithium and Magnesium show some similarities in their physical properties as they are diagonally placed in periodic table CORRECT ANSWER Lithium is softer among all alkali metals Lithium chloride is deliquescent and crystallizes as a hydrate LiCI H O

1 mol each of H and 12 are heated in a closed vessel till equilibrium is obtained If 40 of 12 is converted to HI the value of Kc at the same temperature will be H g 1 g 2HI g 2 1 1 8 1 2 3 2

The potential energy Y curve for H formation as a function of internuclear distance X of the H atoms is shown below Y CO a b C The bond energy of H is b a CORRECT ANSWER X

STATEMENT 1 Reimer Tiemann reaction of phenol with CC14 in NaOH at 340 K gives salicyclic acid as the major product and STATEMENT 2 The reaction occurs through intermediate formation of dichlorocarbene A Statement 1 is True Statement 2 is True Statement 2 is a correct explanation for Statement 1 3 Statement 1 is True Statement 2 is True Statement 2 is NOT a correct explanation for Statement 1 Statement 1 is True Statement 2 is False Statement 1 is False Statement 2 is True

300 ml of a gaseous hydrocarbon when burnt in excess of O2 gave 2 4 lit of CO and 2 7 lit of water vapour under same conditions The molecular formula of hydrocarbon is Question Type Single Correct Type 1 2 3 C4H8 CgH18 C6H14

25 The oxide of an element possess the molecular formula M O3 If the equivalent mass of the metal is 9 th molecular mass of the oxide will be 1 27 2 75 3 102 4 18

What is the molality of a 3 M solution of NaCl having a density 1 25 g mL The molar mass of NaCl is 58 5 g mL A 2 79 m B 4 23 m C 1 5 m D 3 92 m

Chemists graph kinetic data to determine rate constants and the order of reactions Analyze this data f the slope is 0 0100 for this reaction determine the rate constant k or this reaction

19 Photons of energy 6 eV are incidented on a potassi surface of work function 2 1 eV What is the stopp potential a 6 V e 3 9 V Qx 3 E KE tev b 2 1 V d 8 1V