Physical Chemistry Questions

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

Identify the reaction from following havingtop position in EMF series Std red potential according to their electrode potential at 298 K 2 Mg 2e Mg s Fe2 2e Fe s Au 3e Au s 3 CORRECT ANSWER

ample 17 Container I and II contain H SO and oleum respectively H SO4 100 g in 1 L solution Oleum 100 g in 1 L solution HH Container l Container II If 0 1 M NaOH is added in Container I then it required x L NaOH for complete neutralis while Container Il required 1 09x L NaOH for complete neutralisation The tap in conta Il is now opened and oleum mixture is allowed to drip from Container II at 2 g s ther minimum time in s to the nearest integer after which Container II will require x L of N for complete neutralisation is Density of solution of container II is 1 4 g ml 1

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

What will be the concentration of Pb 2 ions when PbSO4 Ksp 1 8 10 8 starts to precipitate from a solution of SO4 2 ions with 0 0045 M concentration Question Type Single Correct Type 1 2 3 4 4 x 10 6 M 4 x 10 8 M 2 x 10 8 M 8 1 x 10 7 M

2 If one wanted to determine the mass of a single Argon atom what information would need to be know to complete this calculation Also provide the flow or pathway units labels arrows only atom Ar Info required here do not give a calculation 3

neet prep Chemical Bondi March 2021 Which one of the following pairs is isostructu having the same shape and hybridization 1 BCls and BrCls 2 NH3 and NO 3 NF and BF3

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

Electron revolving in first orbit of hydrogen with uncertainty of 0 1 of its velocity then uncertainty n its position will be 1 2 66 10 2 cm 3 2 66 x 10 6 m 2 2 66 x 10 8 m 4 2 66 x 10 0 cm

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

The solubility of a solid in H O at different temperature is indicated in accompanying diagram W mass of solid will crystallize when 40ml of a solution that is saturated at 80 C is cooled to 20 C A 30g B 24g C 36g D 12g solubility g per 100 ml H O 19 20 40 60 80 100 Temperature t C

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

7 Molar conductivity of NH4OH can be calculated by the equation a A NH4OH A Ba OH 2 A NH CI A BaCh b A NH4OH ABaCl A NH4Cl A Ba OH 2 NH C 4 c A NH4OH d A NH OH A Ba OH Ba OH 24 A NHACI 20 A Ba OH BaCl Quaros 0

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

I If 2 4 gm of a metal displace 1 12 litre hydrogen at normal temperature and pressure Equivalent weight metal would be 1 12 4 1 2 11 2 2 24 3 1 2 x 11 2

34 If 60 of a first order reaction was completed in 60 minutes 50 of the same reaction would be completed in approximately log 4 0 60 log 5 0 69 a 45 minutes c 40 minutes b 60 minutes d 50 minutes

Consider the reaction Cl g 2Br aq 2Cl aq Br The emf of the cell when CH Br Br 0 01 M and Cl gas at 1 a pressure will be E for the above reaction is 0 volt 1 0 54 volt 3 0 24 volt 2 0 35 volt 4 0 29 volt

Gold number of hemoglobin is 0 03 Hence 100 mL of gold sol will require how much hemoglobin so that gold is not coagulated by 10 mL of 10 NaCl solution Question Type Single Correct Type 1 2 3 4 0 03 mg 30 mg 0 30mg 3 mg

C 0 99 d 0 01 4 H S gas is used in qualitative analysis of inorganic cations Its solubility in water at STP is 0 195 mol kg Thus Henry s law constant in atm molal for H S is a 0 195 c 3 897 10 b 5 128 d 2 565 10 4

Small electric strip heaters with a width of 6 mm are oriented in a horizontal position The strips are maintained at 500 C and exposed to room air at 20 C Assuming that the strips dissipate heat from both the top and the bottom surfaces estimate the strip length required to dissipate 2 kW of heat by free convection

An intensive property of a substance is O a independent of the amount present Ob dependent only on its temperature Oc d Oe not affected by its temperature dependent on its volume but not its mass dependent only on its mass and volume

In Dumas method for estimation of nitrogen 0 1 g of an organic compound gave 30 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure The percentage composition of nitrogen in the compound is Aqueous tension at 300 K 15 mm Hg 19 7 49 1 28 2 31 4

5 Rearrange the following I to IV in the order of increasing masses and choose the correct answer Atomic masses N 14 O 16 Cu 63 1 molecule of oxygen I II 1 atom of Nitrogen III 1 x 10 10 x gm molecular weight of oxygen IV 1 x 10 10 x gm atomic weight of copper 1 II I III IV 2 IV III II I 3 II III I IV 4 III IV I II

16 According to Born Oppenheim approximation the total energy of molecule is equ le de F de

Q 3 4 10 K kg mo O 10 Kg mol O 10 K kg mol 1 The increase in boiling point of a solution containing 0 6 g urea in 200 g water is 0 50 C Find the molal elevation constant 00 16

1 A solution contains 1 44 10 2 M potassium chromate and 5 58 10 3 M potassium sulfate Solid lead nitrate is added slowly to this mixture What is the concentration of chromate ion when sulfate ion begins to precipitate chromate M

The standard reduction potentials of Cu Cu an Cu Cut are 0 337 and 0 153 V respectively The standard electrode potential of Cut Cu half ce is 1 0 184 V 3 0 521 V 2 0 827 V 4 0 490 V

c less than antistokes lines d equal to Rayleigh line 20 Homonuclear diatomic molecules are often found to be a microwave active b IR active c uv active d Raman active O 2 State True or False

A compound of magnesium contains 21 9 magnesium 27 8 phosphorus and 50 3 oxygen What will be the simplest formula of the compound a Mg P O c Mg P 0 3 b MgPO d MgP 04 1 V in

When water is heated from 0 C to 10 C its volume 1 2 3 4 Correct Answer 4 Your Answer 1 Increase Decrease Does not change First decreases and then increases

Q 4 O O moderate 40 by weight solution will contain how much mass of the solute in 1L solution density of the solution is 1 2 g mL 480 g 48 g O 38 g 4 1 00 21 O

Enthalpy of sublimation of iodine is 1 24 cal g at 200 C If specific heat of 12 s and 12 vap are 0 055 and 1 0 031 cal g K respectively then enthalpy of sublimation of iodine at 1 250 C in cal g is A B 22 8 11 4 1 C 2 85 D 5 7

The heat of neutralisation of a strong acid and a strong alkali is 57 0 kJ mol 1 The heat released when 0 5 mole of HNO3 solution is mixed with 0 2 mole of KOH is A B C D 57 0 kJ 11 4 kJ 28 5 kJ 34 9 kJ

A 0 1064 g sample of a pesticide was decomposed by the action of sodium biphenyl in toluene The liberated CI was extracted with water and titrated with 23 28 mL of 0 03337 M AgNO3 using an adsorption indicator Express the results of the analysis in terms of percent aldrin C12H8C16 FW 364 92

A giant molecule contains 0 25 of a metal whose atomic weight is 59 Its molecule contains one atom of tha metal Its minimum molecular weight is 1 5900 2 23600 3 11800 4 100 59

c 1 70eV d 4 The value of charge on the oil droplets experimentally observed were 1 6 10 19 and 4 10 19 coulomb The value of the electronic charge indicated by these results is a 1 6 10 19 16 b 2 4 10 19 c 4x10 19 d 0 8x10 19 The Bohr s energy equation for H atom reveals that the 8x2

Atoms A B C and D are presents at corners face centres body centres and edge centres respectively in a cubic unit cell If the atoms touching one of the 2 fold 3 fold and 4 fold axis of symmetry are removed then formula of compound is

One mole of ice is converted into the water at 273 K The entropies of H O s and H O 1 are 38 20 and 60 01 J mol K respectively The enthalpy change for the conversion is 1 59 54 J mol 2 5954 J mol 3 595 4 J mol 4 320 6 J mol

5 Following reactions are taking place in a Galvanic cell Zn Zn 2e Agt e Ag 2 Which of the given representations is the correct method of depicting the cell a Zn s Zn aq Ag aq Ag s b Zn Zn Ag Agt 2 2 c Zn aq Zn s Agt s Ag aq 2 d Zn Ag Zn aq Ag s

The entropy change in the fusion of one mole of a solid melting at 27 C the latent heat of fusion is 2930 J mol 2 is 3 1 9 77 JK mol 2 10 73 JK mol 3 2930 JK mol 4 108 5 JK mol 4 7 F

Write antonyms of the underlined words and rewrite the sentences i Some clothes were damp when I went to the backyard Ans ii The leaves of the mango tree look dirty Ans iii The children were happy to see the stranger

For the process H O 1 H O g at T 100 C and 1 atmosphere pressure the corre choice is 1 ASsystem 0 and A Surrounding 0 2 ASsystem 0 and A Ssurrounding 0 3 ASsystem 0 and A Surrounding 0 4 AS system 0 and A Surrounding 0

A metal M reacts with dil H SO4 is present as its metal sulphide X On heating X in air gives oxide Y and a gas Z X Y Z are respectively copper sulphide copper oxide sulpur dioxide O zinc sulphide zinc oxide sulpur dioxide O copper sulphide copper oxide carbon dioxide O zinc sulphide zinc oxide carbon dioxide

The half life of first order decomposition of NH4NO3 is 2 10 hr at 288 K temperature NH4NO3 aq N O g 2H 0 1 if 8g of NH4NO3 is allowed to decompose The time required for NH4NO3 to decompose 90 and the volume of dry N 0 produced at this point measured at STP ara respectively 1 2 3 4 ct Answer 1 Answer 4 incorrect d to Bookmark List View In English 6 978 hr 2016 L 0 319 hr 2 12 L 0 319 hr 2 016 L 6 978 hr 2 241

2 A solution contains 1 29 10 2 M calcium acetate and 1 12 10 2 M barium nitrate Solid potassium chromate is added slowly to this mixture What is the concentration of barium ion when calcium ion begins to precipitate Ba2 M

You have available 1 liter of a buffer solution containing 0 100 M fluoride ions F and 0 126 M hydrogen fluoride HF What is the pH of the buffer The Ka value for HF 6 8 x 10 4 Do not enter a unit with your answer Round your answer to three places to the right of the decimal point What is the pH of the buffer in question 1 after the addition of 0 010 moles of sodium hydroxide NaOH You may assume the solution volume does not change after the addition of NaOH Do not enter a unit with your answer Round your answer to three places to the right of the decimal point

Q 20 Which mixture of solutions having pH 7 Given H CO3 K1 4 2 x 10 7 K 4 8 10 11 H3PO4 K1 7 5 x 10 3 K 6 2 x 10 8 K3 1 0 10 12 Answer A B C Your Attempt Correct answer 40 ml of 0 050 M Na2CO3 50 ml of 0 040 M HCI 40 ml of 0 020 M Na3PO4 40 ml of 0 040 M HCI 50 ml of 0 10 M Na3PO4 50 ml 0 10 M NaH2PO4 O D 40 ml of 0 10 M H3PO4 40 ml of 0 10 M Na3PO4

30 A B and C are in equilibrium as shown in the diagram Which of the following relations among the rat constants is true B A K k3 K 3 2 K2 A k k k 3 k3k 1k 2 B k k k3 k 3k 1k 2 C k k 2k3 k 3k 1k D k 1k2k3 k 3k k 2 C

If a reaction has a Kea 1 and all reaction components are at 1 M then the reaction will proceed in the direction and AG for the forward reaction will be reverse negative O reverse positive O forward negative O forward positive O Cannot be determined