General Questions and Answers

Please explain why in this question kinetic energy and pot ential energy will not be conserved A shell in flight explodes into four unequal parts Which of the following is conserved 1 Potential energy 2 Momentum 3 Kinetic energy 4 Both 1 3

10 ml of a sample of H O solution liberates 112 ml of O gas at STP upon decomposition Identify the correct statement s A Normality of the above sample of H O2 is 0 5 N B 15 ml of the same H O solution liberates 224 ml of O gas at 1 5 atm and 273 C C DI Milliequivalents of hypo required for the titration of liberated I when 10 ml of the same sample of H O solution is treated with excess of acidified solution of KI are 20 06 Gil of of Ha in 21 06

4 1 2 3 4 Following diagrams explain which Properties of metals Beating iron nail with hammer Complete the following table 1 5 6 7 8 AUTUI VIG Wood Rubber Pencil lead Salt solution Which gas burns with a pop sound a c Hydrogen Oxygen Nature of metal oxide is a Basic c Neutral b d The property of metals due to which they can drawn into wires a Conductance b Sonorous c Ductility d Malleability b d Property Passing electricity through any Material Appearance Conduction of heat Malleability Ductility r Insulator Nitrogen Carbondioxide Non metal solution of which is used as an antiseptic on wounds a Potassium Dichromate Potassium permanganate b c Sodium chloride d Copper Sulphate Acidic None of these letal 1 of 2 Name the following type of reaction Copper sulphate CuSo Zinc Zn Zinc Sulphate Znso Cu Copper Displacement addition Write any three differences between metals and non metals on the basis of fol lowing characters Non Metal

The standard state Gibbs free energies of formation of C graphite and C diamond at T 298 Kare AG C graphite 0kJ mol 4G C diamond 2 9 kJ mol The standard state means that the pressure should be 1 bar and substance should be pure at a given temperature The conversion of graphite C graphite to diamond C diamond reduces its volume by 2x10 6m mol If C graphite is converted to C diamond isothermally at T 298 K the pressure at which C graphite is in equilibrium with C diamond is Useful information 1 J 1 kg m s2 1 Pa 1 kg m s 1 bar 105 Pa 2

4 X 1 Calculate the mass of CaO formed by heating 50g of CaCO3 in the reaction CaCO3 CaO CO2 Question Type Single Correct Type 1 28g 2 56g English Review 3 100g

USE OF FREE ENERGY IN CHEMICAL EQUILIBRIA The alkalinity of water is due to the presence of ans Hydroxyl ions All the above Carbonate ions Bicarbonate ions

A cylinder contains 0 32 g of oxygen The same volume of an unknown gas X under similar conditions of temperature a pressure weighs 0 26 g The gas X is known to contain only carbon and hydrogen atoms in the ratio of 1 Identify the gas X Ans C

Find the total negative or positive charge on a 2 g silver coin The atomic mumber and atomic mass of silver is 47 and 107 9 u respectively Given bungadro s number is 6023 x 10 ml

The spin only magnetic moment in BM and 62 geometry of Cu NH are 1 2 83 Tetrahedral 2 1 73 Tetrahedral 3 2 83 Square planar 4 1 73 Square planar A compound of vanadium chloride has spin only a Cu NE surfafa 1 2 8 2 1 7 3 2 8 4 1 7

500 ml of 2M hcl and 100 mL of 2M h2 so4 and 1 gram equivalent of monoaci dic alkali are mixed together 30 Ml of th is solution need 20 mL of 143 g Na2CO 3 xh20 in 1 L solution Calculate water o f crystallization of Na2CO3 xh20

SolveLancer Test Which of the following can be used to clean turbidity of water as it is does not increase toxic ions in water SolveLancer Test a Alum b Vinegar c Calcium salts d Powder of kernel of tamarind seeds

1 Ca 2 Fe 3 Qu 125 Arrange the following in the order of their decreasing electrode potentials Mg K Ba Ca 1 K Ba Ca Mg82 Ba Ca K Mg 3 Ca Mg K Ba 4 Mg Ca Ba K 136 The voltage of a cell Mg 2e Mg s E Cu 2e Cu s E standard EMF of the 2 4 some times positive and some tim 126 For the cell reaction to be spontaneous the EMF of the cell should be

Color green Stock 10 0m g 1 82 or colding 11 If you wanted to create a 1 500 dilution of the original stock solution how would you do this Be sure you write out a your procedure including b which solution from your serial dilution you would use as a starting point c how many milliliters of the solution you would use and d how many milliliters of water would be added to create your dilution

The energy of the second Bohr orbit in the hydrogen atom is 3 41eV The energy of the second Bohr orbit of He ion would be uestion Type Single Correct Type 1 2 0 85 eV 13 64 eV

ALLEN Number of moles of MnO required to oxidize 87 one mole of ferrous oxalate completely in acidic medium will be 1 7 5 moles 2 0 2 mole 3 0 6 mole 4 0 4 mole of fi fe fe MnO STERE arit 1 7 5 2 0 2 3 0 6 4 0 4

There are 10 identical containers of vol ume V each of them have an ideal gas at a same temperature t the first contai ner has a pressure of 1 ATM the secon d one has a pressure of 2 ATM 3rd has pressure of 3 ATM and so on the 10th c ontainer has a pressure of 10 ATM if all the 10 containers are connected by a th in tube then what will be the final press ure in ATM

The fraction of current carried by each ion in solution is equal to the ratio of conductivity of the ion in solution to the total conductivity of solution If in a solution which is 0 1 M in Na SO4 and 0 01 M in H SO4 assume complete ionisation Given Am of Na H and SO2 are 50 1 S cm mol 1 349 8 S cm mot and 160 S cm mor respectively Select the correct statement A The fraction of total current carried by Nat is more than that of H B The fraction of total current carried by H is more than that of SO2 C The fraction of total current carried by SO 2 is more than that of Nat D The fraction of total current carried by each ion is in order SO 2 Na H

Br 1 Mg ether NO A 1 CO 2 H O Product B is 1 3 Nitro benzoic acid 2 3 Nitro benzaldehyde 3 3 Amino benzoic acid 4 3 Amino benzaldehyde What in the B 64

Upon heating with Cu S the reagent which do S not give copper metal is 1 CuFeS 2 CuO 3 Cu 0 4 CuSO4

Q 6 MCQ Marks 4 1 O If mass of a proton is 1 6 10 27 kg then number of moles of proton in 1 kg is 1 A 1 6 10 x6 022 10 3 B C 1 6x 10 27 6 022x102 6 022x1023 1 6x102

sublimation energy Na S 650 kj mole Dissociation energy Cl 2 400 kj mole ionisation energy Na g 500kj mole Electron gain enthalpy Cl g 350kj mol e Using born haber cycle find the value o f lattice energy in KJ mole Please expl ain the entire process

N For reaction aA L mM In condition of sudden volume increase degree of dissociation decreases it represents that Question Type Single Correct Type 1 a l m 2 a l m 3 a l m English Review Q 4 a l m 9

In order to balance the half reaction Cr O72 are added is Question Type Single Correct Type 15 2 9 English Review Cr the number of e H and H 0 2 7 14 6 3 6 14 7

Consider the following reaction in aqueous 54 solution 5 Br aq BrO aq 6H aq 3Br aq 3H O A If the rate of appearance of Br at a particular time during the reaction is 0 025 M sec what is the rate of disappearance in M sec of BrO at that time 1 0 025 M sec 3 0 075 M sec 2 0 042 M sec 4 0 0083 M sec Bro 0 025 M sec fra in M sec and fre facf Br f W 5 Br aq BrO aq 6H aq 3H O l 1 0 025 M sec 3 0 075 M sec at 3Br aq 2 0 042 M sec 4 0 0083 M sec

A piece of parmesan cheese is burned in a soda can calorimeter and heats up 0 235 kg of water by 2 95 C The calorimeter was calibrated and had a calorimetry constant of 8 50 kcal kg C Given that protein contains 4 00 kcal g calculate the mass in g of the protein contained in the parmesan Assume that the cheese is composed primarily of protein

A bulb of unknown volume V ideal gas at 2 atm pressure It was connecte to another evacuated bulb of volume 0 51 tre through a stopcock When the stopco was opened the pressure in each bulb be came 0 5atm Then V is 1 17 ml 2 1 7 L 3 0 17L 4 0 34

2 Consider the following reaction sequence CaCl aq CO g H O CaCO3 s 2HCl aq heat CaCO3 s CaO s H O g If the percentage yield of the 1st step is 80 and that of the 2nd step is 75 then what is the expected overall percentage yield for producing CaO from CaCl 1 50 3 55 2 70 4 60

24 An organic compound contains carbon hydrogen and oxygen Its elemental analysis gave C 38 71 and H 9 67 The empirical formula of the compound would be AIPMT Prelims 2008 1 CH O 3 CH Q 2 CH O A CHO

d Ca ions are impo 49 The product obtained as a result of a reaction of nitrogen with CaC is a Ca CN c CaCN b Ca CN 2 d CaCN 3 11 1 NEET Phase 1 2016 WB JEE 2017

A sulphide ore first converted into its oxide before reduction This is done because 1 A sulphide ore cannot be reduced to metal at all 2 No reducing agent is found suitable for reducing a sulphide ore 3 The enthalpy of formation of CO is more than that of CS 4 A metal oxide is generally less stable than the metal sulphide 74 44 Rafa fafan 1 is 2 314 1 a safe for a 14 3 CO af CS fat ant tr ci fe 4 STERIS 414 4041 A CHISS

In Kjeldahl s method of estimation of nitrogen in organic comp g of organic compound evolved ammonia which is neutralize by 20 ml of 0 2 M H SO4 Percentage of nitrogen in the organic compound is O 12 O 24 O 28 38

ALLE Which of the following compound on reaction 83 with excess of AgNO forms three moles of precipitate white 1 PtC1 6NH 3 PtC1 5NH 2 PtCl4 4NH 4 PtC1 3NH An AgNO fal 1 PtC1 6NH 3 PtCl SNH 2 PtCl 4NH 4 DIGI ONEL

How many mega joules of energy can on obtain from growing 2 375 acres of switchgrass over one year Assume that c can obtain 500 gallons of ethanol per acre switchgrass per year Group of answer choices 500 MJ 1 221 105 MJ 44 348 MJ

3 0 075 M sec If AHeaction for 2H O 1 196 kJ then find the AH 4 0 0083 M sec 3 0 075 M sec 4 0 0083 M sec 2H O A O g is 55 af ff 2H O 1 2H O O g of H O A AH H 196 kJ AH H O A reaction fer and farferl Given AH H O 188 kJ mol 1 286 kJ mol 3 494 kJ mol 2 143 kJ mol 4 98 kJ mol 1 286 kJ mol 3 494 kJ mol 2 143 kJ mol 4 98 kJ mol

5 C verfat will be for which enough gnug 25 The solubility product of CaSO4 2H O is 2 4 x 10 5 What mass of this salt will dissolve in 1 0 L of 0 0 SO4 of lone in

Determine the mass of KOH if 46 3 of K3PO4 is produced and 92 8 of H3PO4 remains unreacted Atomic masses K 39 1 0 16 H 1 0 P 31 3KOH aq H3PO4 aq K3PO4 aq 3H20 e 367 g KOH 14 2 g KOH 36 7 g KOH you KOLU 2

The activation energy for a reaction is 9 kcal mol The increase in rate constant when its temperature is increased from 298 K to 308 K is R 2 cal K mol 1 100 213 1 63 OPTIONS CLEAR SELECTION OA 75 OB 25 C 100 MARK FOR REVIEW

Correct order of nucleophilicity for SN reaction 1 H H 0 CH COO 2 OH CH COO H O 3 H O CH COO OH 4 H O H CH COO

5 From the values of AH and AS predict which of the following reactions would be spontaneous at 25 C reaction A AH 10 5kJ mol AS 30J K mol reaction B AH 1 8kJ mol AS 113J K mol If either of the reaction is nonspontaneous at 25 C at what temperature might it become spontaneous

5 Compute the mass in grams of KCIO necessary to produce 67 2 litres of oxygen at S T P according 3 to the reaction 2KCIO3 s 2KCI s 30 g Molecular weight of KCIO3 122 5 1 96 2 2 3 122 5 4 245

A levo rotatory compound 2 chloro 2 pheny I butane is undergoing nucleophilic substitution with OH following SN1 mechanism The product s obtained is are a leavo rotatory 2 phenyl butan 2 ol b De xtro rotatory 2 phenyl butan 2 ol c 1 1 Mixture of both a and b d None o f these

Assertion A compound is made from sam e or different atoms combined in a fixed pro portion by mass Reason Constituents of compound exhibit their characteristics a Both assertion and reason are true and r eason is the correct explanation of assertio n b Both assertion and reason are true and reason is not correct explanation of asserti on c Assertion is true but reason is false d Both assertion and reason are false

12 Select the correct statement s among the following a Mass by volume percentage unit is com monly used in medicine and pharmacy b Mass percentage concentration term is dependent on te mperature c In general a solute dissolve in a solvent if the Intermolecular interactions among mo lecules are much different in solutes and solvent d The solubility of a solid in a liquid in significan tly affected by temperature as well as by pressure 1 Only a and b 2 Only a and d 3 c 4 a c and d Answer given is 1 but how is b statement correct

44 Answer A SrCO3 s Addition of which of the following substance can increase the solubility of SrCO3 according to above reaction Rate this question NaCl B HCL Sr aq CO3 aq C K CO3

10 Write chemical equations for the following 1 Acid hydrolysis of Pentamide 2 Propanoic acid reacts with ammonia 3 Benzoic acid is treated with thionyl chloride 4 Hexanone on reaction with hydrazine

8 Assertion Haloalkanes react with KCN to form cyanoalkanes Reason KCN completely ionises in solution Both assertion and reason are correct Ostatements and reason is the correct explanation of the assertion 1 poir Both assertion and reason are correct O statements but reason is not the correct explanation of the assertion O O Assertion is correct but reason is wrong statement Assertion is wrong but reason is correct statement

At 80 C the vapour pressure of pure liquid A is 520 mmHg and that of pure liquid B is 1000 mmHg If a mixture of A and B boils at 80 C and 1 atm pressure the amount of A in the mixture is 1 25 mol 2 50 mol 4 48 mol ALLEN 57 3 34 mol An electron initially present in 80 C fer 1 25 3 34 en 520 mmHg 1000 mmHg 1 fe 2 50 4 48 A

Which of the following order is correct 1 Cr2 Fet2 Reducing character 2 Mn Crt Oxidising character 3 WO CrO Stability order 4 All of these 87 3 H 4 PR 1 Cr 2 Fe 2 34rch verta 2 Mn 3 Cr 3 31fchten gefa 3 WO CrO Penfura sh 4

or a particula A B the te constant is 0 693 min 1 If the initial concentration of the reactant A is 1 M then the rate of reaction after 1 minute will be OPTIONS MARK FOR REVIEW CLEAR SELECTION OA 0 35 M min OB 0 14 M min C 0 693 M min

10 grams of a solution contains mixture of NaOH and Na CO when titrated in presence of phenolphthalein indicator 17 5 ml 1M HCI was required In separate titration 10 gm of same stock solution when titrated using methyl orange indicator 22 5 ml of the same acid was required Mass percentage of NaOH in the mixture is