General Questions and Answers

Which of the following statements best describes the effect of increased carbon dioxide pressure in the blood It reduces the oxygen affinity and the oxygen carrying capacity It reduces oxygen affinity but does not affect the oxygen carrying capacity It affects oxygen affinity and oxygen carrying sulfur capacity

9 A narrow spectrum antibiotic is active against a either gram positive or gram negative bacteria b gram negative bacteria only c single organism or one disease d both gram positive and gram negative bacteria

A small block with a mass of 150 gm can slide freely along the smooth inner surface of a semicircular wire with a radius of 8 cm that rotates about a vertical axis at a uniform rate of 2 revolutions per second as shown in the figure Find the value of for which the block will remain stationary with respect to the rotating wire take g 10 m s 8cm

15 Consider a fuel cell supplied with 1 mole of H gas and 10 moles of O gas If fuel cell is operated at 96 5 mA current how long will it deliver power Assume 1 F 96500 C mole of electrons a 1 x 106 s b 0 5 106 s c 2 x 106 s e 5 x 106 s S d 4 106 s X

A 0 50 g sample containing only anhydrous FeCl3 molar mass 162 5 g mol and AlCl3 molar mass 133 5 g mol yielded 1 435 g AgCl molar mass 143 5 g mol The mass of FeCl in the sample is O 0 3126 g O 0 4157 g O 0 2345 g O 0 1567 g

A 4 406 g sample of a compound containing only C H and O was burnt in excess oxygen 8 802 g of CO and 3 604 g of H 0 were produced Determine the empirical formula of the compound using section 6 of the databooklet 2 M for calculations 1 M correct EF

25 calories of heat is required to raise the temperature by 10 C for 0 5 mol of a unknown gas at constant volume Find mol heat capacity at constant pressure of unknown gas in calorie Given R 2 calorie mole K

Which of the following is an incorrect statement Only One Correct Answer A A mixture of mercury and water is separated by using separating funnel B C D Fractional distillation is used to separate different components of air Drugs from blood can be separated by chromatography Crystallisation is used to purity liquids

6 The boxes in the illustrations show tiny samples of air Assume they are at the same temperature A MEADA AO C B a List the samples in order of increasing gas pressure Explain your reasoning b Sketch a volume of air that has a pressure in between the pressures in boxes A

Two bulbs X and Y of equal volumes are connected through a stop cock Each bulb contained 9 6 g of dioxygen gas at 0 4 atm pressure and 300 K The first bulb X is then heated to 500 K keeping bulb Y at 300 K After removing the stop cock Final pressure in atm of gas in bulb X is

5 mole of each of H SO CH4 C H6 and N are kept in a container A hole was made in the container After 3 hours the partial pressure of CH4 is 0 02 tm How many gases have partial pressure greater than CH4 in the container

Molecular nitrogen can be converted into NO by the following reaction sequence N 3H 2NH3 ANH3 502 ANO 6H O Calculate the mass of NO formed from 100 g of N with excess of H and O2 Atomic mass H 1 N 14 O 16 A100 gm B 150 60 gm

Which of the following is not true about a catalyst a Mechanism of the reaction in presence and absence of catalyst could be different b Enthalpy of the reaction does not change with catalysts c Catalyst enhances both forward and backward reaction at equal rate d Catalyst participates in the reaction but not consumed in the process e Use of catalyst cannot change the order of the reaction

8 Which of the following statements is not correct a La OH is less basic than Lu OH 3 3 b In lanthanide series ionic radius of Ln ions decreases c La is actually an element of transition series rather than lanthanoid series d Atomic radii of Zr and Hf are same because of lanthanoid contraction

Which of the following statements is are true Urms 0 TK is constant independent of T Uav 0 TK Wavelength of ejected photoelectron can be calculated by Ozone gas can be absorbed by alkaline pyrogallol solution DOxygen gas can be absorbed by alkaline pyrogallol solution hc where E is kinetic energy of ejected photo electr

15 The half life period of the following first order reaction is C H O g CH g CO g Given that the initial pressure of C H4O2 g is 84 mm and total pressure at the end of 16 minute is 110 mi 1 30 minute 2 60 minute 3 4 3 minute 6 minute

is that the same 21 Airplane takeoff from an aircraft carrier is assisted by a steam driven piston cylinder with an average pressure of 1250 kPa A 17500 kg airplane should accelerate from zero to 30 m s with 30 of the en ergy coming from the steam piston Find the needed piston displacement volume Solve Problem 5 21 but assume the steam pressure in the cylinder starts at 1000 kPa dropping linearly with volume to reach 100 kPa at the end of the process

6 Small quantities of solution of compounds TX TY and TZ are put into separate test tubes containing X Y and Z solutions TX does not react with any of these TY reacts with both X and Z TZ reacts with X The decreasing order of oxidation of the anions X Y Z is a Y Z X c Y X Z b Z X Y d X Z Y

c 28 g of CaSO4 were dissolved in HCl and the solution was made upto one litre with distilled water 50 ml of above solution required 25 ml of EDTA solution on titration 50 ml of tap water consumed 35 ml of same EDTA solution EBT indicator 100 ml of this water after boiling cooling and filtering required 10 ml of EDTA solution in titration Calculate the permanent temporary and total hardness in F 2

NEET 10 In Bohr s model of hydrogen atom if atomic radius of the first orbit is x then the radius of the 3rd orbit w NCERT Pg 46 will be emoped cemil S zomil 1 1 x 3 3 gem 2 3x atic on Bohr s on in

6 The intermolecular potential energy for the molecules A B C and D given below suggests that Interatomic distance pm 0 100 200 Potential Energy k mol 400 300 500 600 50 A A D has the shortest bond length Interatomic distance pm A A 100 A B 150 D B A A has the largest bond enthalpy

4 Which of the following is correct 1 For H and He z 1 and molar volume at STP is less than 22 4 L 2 For H and He z 1 and molar volume at STP is greater than 22 4 L 3 For H and He z 1 and molar volume at STP is less than 22 4 L 4 For H and He z 1 and molar volume at STP is greater than 22 4 L

Select the correct statement s Select answers A In general more the ionization energy more will be the electronegativity B Electronegativity increases means metallic character increases C In general lower the ionization energy higher will be the reducing property D Cl has higher electron affinity than F

A manometer attached to 36 litre flask contains some inert gas ammonium carbamate NH COONH4 s having no difference in mercury level initially as shown NH COONH s decomposed completely on heating according to reaction NH COONH s 2NH g CO g P 1atm NH COONH s Hg 0 If same amount of NH COONH s is decomposed completely in separate container and produced NH3 g required 500 ml of neutralisation During the process temperature remains at 300K R 0 08 atm litre mole K 1atm 76 cm of Hg The difference in height of Hg column in mm after complete decomposition of NH COONH s is 2M 3 H PO solution for complete

153 Consider the following electron addition process AH202 i 0 AH 0 AH3S AHS AH4 ii S AH3 S iii P P p Then which of the following statement is incorrect regarding given informati a AH5 is less negative than AH 3 and AH b AH is less negative than AH 3 AH 2 is more positive than AH 4 d None of these AH6

A fatty acid was spread on the surface of water in a Langmuir film balance at 150C The following data were obtained Area cm2 microg 1 5 7 28 2 507 1070 2200 11100 Surface pressure mN m 1 30 0 3 0 2 0 1 0 05 0 01 Estimate a the molar mass of the fatty acid and b the molecular cross section area

3 The following table shows the melting points T C of naphthalene at each weights g of naphthalene 128 g mol and biphenyl 169 g mol Calculate the heat of fusion of naphthalene kJ mol 0 C 273 K R 0 0821 L atm mol K 8 31 J mol K 10 pts Naphthalene g 5 00 5 00 5 00 5 00 Biphenyl g Melting point T C 0 00 80 2 0 73 75 2 1 65 69 7 2 83 63 7

1 10 points There are 4 8778 x 1023 atoms in a metallic alloy sample containing only copper and silver If the sample has a mass of 82 0653 g find the mass percentage of copper in the alloy to 3 significant figures

h the column I with column II 1 He CL 3X Xe ver 1 2 3 A A A List 2 A Highest electron gain enthalpy B Most electropositive element C Vander waal s radius D Highest ionization energy B B B C C C

16 Consider the equilibrium obtained by electrically connecting zinc amalgam Zn Hg and HgO electrodes in mercury cell Zn Hg HgO s ZnO s Hg 1 Under this equilibrium what is the relation between the potential of the Zn Hg and HgO electrodes measured against the standard hydrogen electrode a Zn Hg electrode potential is equal to HgO electrode potential b Zn Hg electrode potential is more than HgO electrode potential c HgO electrode potential is more than Zn Hg electrode d Cell voltage at above said equilibrium is 1 35 V e Both c and d

Match the column I Elements with column II AEH List 1 1 Most reactive non metal 2 Most reactive metal 3 Least reactive element 4 Metal forming binary halide Answer 1 2 A A A EH AEGH List 2 B B A B C D AEH 419 AEH 1681 AH 738 AEH 2372 AEH AEGH 3051 48 AEH AEGH 3374 AEH 1451 ALEH 5251 328 AEGH 40 AEGH 48 C C

7 Match the type of interaction in column A with the distance dependence of their interaction energy in column B A i ion ion ii Dipole dipole iii Londondispersion B a b c d 7 7 7 2 A i a iii C C i b ii d iii c B i a ii b iii d D i a ii c iii d

The electronic configuration of some neutral atoms are given below A 1s 2s B 1s 2s 2p C 1s 2s 2p5 In which of these electronic configuration would you expect to have highest ii IE 3 C B 1 C A i IE 2 B A D 1s 2s 2p 3s 4 B D

c An underground pipeline was found to have different intensity of corrosions because it s some part was buried in sand and other part was buried in clay discuss type of corrosion along with its mechanism in the above set condition 12 51

Arrange the following reactions in order of increasing the value of the reaction entropy A Srxn under the standard state from lowest to highest 1 Cl g F2 g 2 FCI g 2 NH4 2Cr O7 s Cr O3 s 4H O l N2 g 3 NH4NO3 s N O g 2 H O liq 0a1 2 3 b 3 1 2 0c2 301 d 2 1 3 Oel 3 2 Of 3 2 1

This section contains I Matrix Match type question which has 2 Columns Column I and Column II Column I has four entries A B C and D Column has four entries P Q R and S Match the entries in Column I with the entries in Column II Each entry in Column I May Match with one or more entries in Column II Match the Columns Column 1 A COMMOn sait Column 11 P Neutral salt Salt of 0 chloride family R Basic salt Salt obtained by Salt of D recrystallisation of sodium S sodium carbonate family 8 Baking soda C Ferric chloride One Mare Correct Answer s For Each Option

at Two flasks A and B have equal volumes Flask A contains hydrogen at 300 K while flask B has same mass of CH at 600 K i Which flask contains larger number molecules of ii In which flask is the pressure greater and how many times iii In which flask the molecules move faster iv In which flask is the number of collisions with the walls greater

Which of the following is true about Michaelis Menten kinetics O 1 point Km the Michaelis constant is defined as that concentration of substrate at which enzyme is working at maximum velocity It describes single substrate enzymes Km the Michaelis constant is O defined as the dissociation constant of the enzyme substrate complex It assumes covalent binding occurs between enzyme and substrate

How many gram of iron pyrite FeS should be burnt completely to produce sufficeint SO gas needed to decolourise completely 100 ml 0 12 M KMnO4 solution is acidic medium Fe 56 0 1 2 gm 1 8 gm 0 9 gm 00 36 gm

1 The work function of sodium metal is 4 41 x 10 19 J If photons of wavelength 300mm are incident on the metal the kinetics energy of the ejected electrons will be h 6 63 x 10 34 Js c 3 10 m s 10 J

Calculate the density of matter at the center of a 208Pb nucleus How does it compare to the Pb density of 11 34 g cm3 b List the forces of nature in the order of their strength Give their range and exchange particles

1 Indicate if the following electron donor electron acceptor pairs represent potential energy reactions for bacterial growth Assume all reactants and products are at unit activity except that pH 7 e donor a ferrous iron Fe b acetate CH3COO c water H O d hydrogen H e acceptor nitrate NO3 sulfate SO4 ferric iron Fe nitrite NO2 energy rxn Yes or No

One mole of an ideal gas is carried through the reversible cyclic process as shown in figure The max temperature attained by the gas during the cycle 7 a mis12 b c 6R 49 12R 12 49R d None of these saibome STIL on babiber s 4 bar P 1 bar B 1 litre 2 litre

A complex is composed of one chromium ion three bromides and six water molecules Upon addition of excess AgNO3 1 0 g aqueous solution of the complex gave 0 94 g of AgBr The molecular formula of the complex is Atomic weight Cr 52 Br 80 Ag 108 O 16 and H 1 A Cr H O 6 Br3 C Cr H O 4Br2 Br 2H O B Cr H O sBr Br2 H O D Cr H O 3Br3 3H O

molar mass of the Temperature and pressure in Chandigarh are respectively 35 C and 740 mm Hg whereas at Shimla these are 10 C and 710 mm Hg Calculate the ratio of densities of air at Chandigarh d and at Shimla d

On moving across a period the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases The first ionization potentials in eV of Li and Na atoms respectively are Select an answer A B C D 14 6 13 6 13 6 14 6 13 6 13 6 14 6 14 6

A solution contains 0 25 M NaCl and 2 1e 05 M ZnCl2 The available equilibrium data are as follows Zn Cr ZnCl CK 1 01 ZnCl Cl ZnCl CK 1 67 Note The pH of the solution if sufficiently low that you may neglect the hydrolysis of Zn2 The concentration of ZnCl M in the solution is

D Calcium carbonate reacts with HCl to give CaCl and CO according to the reaction CaCO3 s 2HCl aq CaCl aq CO g H O 1 What mass of 20 impure CaCO3 is required to react completely with 250 mL of 0 50 M HCI 1 6 25 g 3 4 75 g 2 5g 4 78 a

7 50 mL of 0 5 M oxalic acid is needed to neutralise 25 mL of sodium hydroxide solution The amount of NaOH in 50 mL of the given sodium hydroxide solution is a 10 g c 40 g b 80 g d 20 g oth 1st Ski 2019

In which of the following options the order of arrangement does not agree with the variation of property indicated against it 1 Si Al Mg Na 2 S Se Te O Increasing metallic character Negative electron gain enthalpy