General Questions and Answers

3 a The osmotic pressure of a sample of blood is 7 atm at 37 C Find the concentration of saline solution that is isotonic with the blood sample at this temperature b Why ethyl alcohol and water can t be separated into pure components by fractional distillation c Derive Duhem Margules equation stating clearly the assumptions 2 2 2

38 Iron is extracted from its oxide ores particularly haematite through reduction with carbon in a blast furnace The process id shown below zone slag 5000 zone 850 C 1000 C 130072 1900 C D C B 53 i Choose the correct options given below based on the process Mark only one oval A A Combustion zone B Reduction zone C Fusion zone D Slag formation A Combustion zone B Fusion zone C Slag formation zone D Reduction zone 1 point A Reduction zone B Combustion zone C Slag formation zone D Fusion zone A Slag formation zone B Reduction zone C Fusion zone D Combustion

For which of the following process AG 0 OA A g 1 atm 90 C B P of A at 1 atm 90 C O H O 1 H O g 1 atm 400 C O H 0 1 H O s 1 0 atm 10 C OA 1 A g 2 atm 90 C B P of A at 1 atm 90 C

Overall half life of the reaction is 15 days Then days if the ratio of ky k ky is 4 2 1 lodine 131 is a radioactive isotope If 10 mg of 1311 has an activity of 4 6 x 10 Bq what is half life of 131 1 in days The average life of a radioactive element is 72min Calculate the time interval in between the stages of 33 33 and 66 66 decay protes A B and C are isodiaphers while C D and E are isobars Calculate the difference of between A and EA B C D E Given Isodiaphers and isobars are formed in successive a and emission respectively In the given radioactive disintegration series ThPb Calculate value of n 2 Where value of n is number of isobars formed in this series suppose there is successive emission of B particles

A magnesium ribbon is burnt in the all t o give a white compound X accompani ed by emission of light If the burning ribb on is now placed in an atmosphere of nitrogen it continues to burn and forms a compound Y a Write the chemical formulae of X an d Y b Write a balanced chemical equation when X is dissolved in water

if an air bubble was trapped under the stopper when the flask filled with the unknown liquid was weighed the experimental density would be incorrect but one cannot tell in which direction too high too low

Chlorobenzene M 112 g mol is stream distilled at 734 torr and 90 C The vapour pressure of chlorobenzene at this temperature is 208 torr The mass of steam required to distill 0 5 kg of chlorobenzene will be a 0 238 kg b 0 717 kg c 0 203 kg d 0 797 kg

There are two radioactive nuclei A B A is a emitter and B is emitter their decay constants are in the ratio of 1 2 What should be the number of atoms of each nuclei at time t 0 so that probability of getting of a and B particles are same at time 0

When 10 g of Paraffin wax C31H64 mw 436 84 is dissolved in water to make oil droplets depending on the radius r of the oil droplets Calculate the number and surface area of oil droplets d 0 82 g cm3 The volume is calculated from the mass the volume of one oil drop from the radius and the number of oil drops is calculated by dividing it After calculating the surface area of one oil drop from the radius multiply the number of oil drops to obtain the surface area of the oil drop Watch out for the unit

de up of bases ic acid eaks down into and oxygen will not take Which of the following are made up of bases Select an answer A B C D Antacid tablet Soap Toothpaste All of the above

Q 58 The weight of CO is required to form Re CO 10 will be g from 2 50 g of Re O according to given reaction Re O CO Re CO 10 CO2 Atomic weight of Re 186 2 C 12 and 16 WA

a CH3COONH4 have greater deg outs solution CORTE RI b Anions which are weaker base than OH do not hydrolyse c The CH3COO have greater degree of hydrolysis in comparision salt solution have equal conc d So hydrolyses but HSO does not undergo hydrolysis 0 01M NH4Cl aq solution at 25 C has a Cl aq 10 M i c DOH 7 SHO oldgifsen HM HMM b NH aq 10 2M d H 10 7 Mond

92 In liquid gas equilibrium the pressure of vapours above the liquid is constant at a constant temperature b low temperature c high temperature d none of these 1995 93 Which one of the following is most soluble a Bi S3 Kp 1 x 10 70 sp 6 x 10 51

An element X on exposure to moist air turns reddish brown and a new compound Y is formed The substance X and Y are Select an answer A B C D X Fe Y Fe O3 X Ag Y Ag S X Cu Y CuO X Al Y Al2O3

Nitrobenzene on reaction with conc HNO3 H2SO4 at 80 100 C forms which one of the following products 0 3 orrect Answer 3 our Answer 4 tatus incorrect 1 2 4 Trinitrobenzene 1 2 Dinitrobenzene 1 3 Dinitrobenzene 1 4 Dinitrobenzene Add to Bookmark List

The set representing the incorrect order Options 1 Si P C N 2 F CI Br 3 Na Mg Al Si 4 O F N C Order of electro negativity Order of electron affinity Order of first ionization potential Order of second ionization potential

2 46 First order reaction is given X Y where X and Y both are optically active compounds with specific rotation 80 mole and 10 mo respectively Initial rotation of pure sample of X was 20 and solution becomes inactive after 22 min the rate constant in min of given reaction is Given In 2 0 7 and In3 1 1 B 0 05 A 0 01 C 0 1 D 0 5 merts

When lead nitrate is heated it breaks down into lead monoxide nitrogen dioxide and oxygen 2 Pb NO3 2 2PbO 4NO2 O The reaction is an example of Select an answer A Combination reaction B Decomposition reaction C Double decomposition reaction Displacement reaction

The number of moles of atoms in 1030 g of Rhodium is x times that of moles of Carbon in 60 g Carbon y times that of moles of Magnesium in 48 g of Magnesium and z times that of moles of Rhenium in 465 5 g of Rhenium Then find the value of x y z

Tollowing is Options 1 the first ionization potential of Al is less than the first ionization potential of Mg 2 the second ionization potential of Mg is greater than the second ionization potential of Na 3 T Bi 3 and Pb 2 are stable due to inert pair effect 4 size of Al is larger than Ga

Which of the given disorders is inborn error of metabolism Phenylketonuria Cystic fibrosis Haemophilia Turner s syndrome

Substitution of a purine base with a pyrimidine base or vice versa is called Transversion Transition

At industrial level which catalyst is not matched properly O Contact process for H SO4 V 05 O Haber s process for NH3 Fe O Ostwald s process for HNO3 MnO Cracking of hydrocarbon Zeolite

In a ceremony the number of adults to the number of children who attended was 3 2 The number of men to the number of women was 2 3 There was an equal number of boys and girls There were 644 more women than girls a How many women were there b When some women left the ceremony the number of men and women remained became the same How many women left the ceremony

Oxidation and reduction process involves the transaction of electrons Loss of electrons is oxidation and the gain of electrons is reduction It is thus obvious that in a redox reaction the oxidant is reduced by accepting the electrons and the reductant is oxidised by losing electrons The reactions in which a species disproportionate into two oxidation states lower and higher are called disproportionation reactions In electrochemical cells redox reaction is involved i e oxidation takes place at anode and reduction at cathode Which one of the following is an example for disproportionation reaction Select an answer A MgO H O Mg OH 2 B C D P4 30H 3H O PH3 3H PO S O SO2 Zn CuSO4 ZnSO4 Cu

When an aqueous solution was treated with AgNO3 a white precipitate was obtained which was soluble in NH OH The aqueous solution contained A Sulfate B Chloride C Acetate D Carbonate

75 The rate constant of the reaction A B is 0 6 10 3 mole per second If the concentration of A is 5M then conentration of B after 20 minutes is 1 3 60 M 2 0 36 M 3 0 72 M 4 1 08 M

Match the following salts of Column 1 with the acids and bases which are used for their preparation with Column II List 1 1 KNO3 2 AgNO3 3 MgCl 4 NH4 2CO3 Answer 1 2 3 A A A List 2 A Nitric acid silver hydroxide B Hydrochloric acid Magnesium Hydroxide C Carbonic acid Ammonium hydroxide D Nitric acid Potassium hydroxide B B B C C C D D

sample of H atoms containing all the atoms in a particular excited state absorb radiations of a particular wave length by which the atoms get excited to other excited state When the atoms finally de excite to the ground state they emit radiations of 15 different wavelength Out of these 15 radiations 5 we wavelengths shorter than the absorbed radiation and 9 have wavelength longer than the absorbed radiation What is the initial excited state of ms

34 Which of the following is correct for H ion A A possible trial wave function for the ion is C 1SA C 1SE B The coefficients of the trial wave function are not equal C A possible trial wave function is w C 1SA C 1SB D The 18 orbitals are not normalised

7 The total number of neutrons present in 54 mL H 0 1 are P d a 3 NA b 30 NA pimots 9th c 24 NA are 8 Total number of electrons present in 48 g Mg in 48 g Mg 2 a 24 3 enigine d none of thes 180 as ni ang Pok

is denoted by the symbol v nu bar v 1 2 1 It is expressed in cm v Amplitude It is defined as the height of the crest or depth of the trough of a wave It is denoted by the letter a It determines the intensity of the radiation m Low energy Low frequency Long wavelength or m The arrangement of various types of electromagnetic radiations in the order of their increasing or decreasing wavelengths or frequencies is known as electromagnetic spectrum v 3x 107 cycle sec 2 cm 10 Wavelength TELEVISION WAVES RADIO WAVES MICROWAVES INFRARED VISIBLE Frequency ULTRAVIOLET 3 1021 11 10 X RAYS Y RAYS High energy High frequency Short wave length types of increasing or decreasing as electromagnetic spectrum The following order Electric field Magnetic field Fig 2 13 The electric a components of an elec Radio waves Television waves Microwav Ultraviole Each type of radiation is sn wavelength

Among the given carbonates bicarbonates find the value of KHCO3 NaHCO3 CaCO3 Ca HCO3 2 K2CO3 and Mg HCO3 2 no of compounds almost insoluble in water x no of compound which liberate CO2 on reaction with HCl z no of compounds that easily undergo thermal decomposition y

Fill in the blanks 1 Silk is obtained from of silk moth 2 Silk fibre is formed of two strands of protein 3 Silk fibre is secreted by the of a silk moth of 4 Silkworm feeds on leaves 5 Breeding and management of silk moths for production of silk is called

Question 165 A certain oxide of iron contains 2 5 g of oxygen for every 7 0 g of iron if it is regarded as a mixture of FeO and Fe2O3 in the weight ratio x y atomic weight of iron 56 1 9 10 2 9 20 14 5 23

226 When some amount of sodium acetate is further added to a mixture of acetic acid and sodium acetate then pH of solution 1 increses 2 decreases 3 remains same 4 none of these can be predicted from given information

The solubility of gases in water as temperature increases The solubility of most solids in water as temperature increases Which of these can be used to fill the blanks and make the statement true decreases increases decreases decreases increases decreases increases increases

Two or more metals or a metal and a non metal combine and By making alloy we can increase the substance Bleaching of coloured objects can be carried out by using colourless biect O and

ode List I P pH of 0 1 M aq BOH solution at 25 C K of BOH 10 Q for the reaction A aq products A 0 8 M at t 10 min A 0 4 M at t 30 min A 0 2M at t 70 min order of reaction is R Co ordination number in hexagonal packing in two dimension S 4 00 gm silver salt of an organic acid mol wt 79 gives 3 24 gm silver residue on strong heating The basicity of acid is A P 1 Q 2 R 3 S 4 C P 4 O 1 R 3 S 2 List II 1 2 2 6 3 3 4 9 B P 4 Q 1 R 2 S 3 D P 2 O 3 R 4 S 1

Two solutions A and B each of 100 L was made by dissolving 4 g of NaOH and 9 8 g of H SO4 in water respectively The pH of the resultant solution obtained from mixing 40 L of solution A and 10 L of solution B is JEE Main 2020

A colorless salt A on strong heating gives a reddish brown gas B a colorless and odorle ss gas C and a solid product D The aqueou s solution of salt A on treatment with aqueo us Kl solution gives a yellow precipitate E I dentities of A B C D and E are a Pb NO3 2 NO2 02 PbO and Pb12 Lead n itrate Nitrogen dioxide oxygen Lead oxide an d Lead iodide respectively b Pbl2 NO2 02 PbO and Pb NO3 2 respec tively c PbO NO2 02 Pb NO3 2 and Pbl2 respec tively d Pb NO3 2 02 NO2 PbO and Pb12 respec

7 Water density p is flowing through the uniform tube of 7 UNA T cross sectional area A with a constant speed as shown The magnitude of force exerted by the water on the curved portion of the tube is GCI Gurukripa CAREER INSTITUTE 1 3pAv 2 pav 3 ZpAv 60 fefe DTS Diamond Test Series for NEET 2021 Created by Universal Document Converter 1 3pAv 2 pAv 3 ZnAv 2 Class XIII Spartan Batch Section A 60

2 9 times 1 3 times 3 3 times 4 27 times 28 For a reaction 2A B product rate law is At a time when t 1 18 C initial concentration 1 Co 2 Ce 3 J k 4 2 0 d A dt k A concentration of the reactant is 1 3 times 3 3 times 28 2A B 34 affent for an frem WH 4341 C fr 1 fo 2 Ce 3 9 20 t 15 4 t 2 9 times 4 27 times d A dt K t al funkat m

A 25 x 10 m volume cylinder is filled with 1 mol of O2 gas at room temperature 300K The molecular diameter of O2 and its root mean square speed are found to be 0 3 nm and 200 m s respectively What is the average collision rate per second for an O2 molecule 1013 2 10 0 3 1012 4 1011

A patient with sepsis will have a temperature greate than 101 F a heart rate higher than 90 beats per minute and a breathing rate higher than 20 breaths per minute What is the temperature in C K C F 32 1 8 F C x 1 8 32 K C 273

Chem Section A This section contains 35 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 3 and 4 out of Which amongst the following is the most stable carbocation CH CH CH CH NH CH CH OH CH CH CH

Consider the leaching of alumina from bauxite Identify the correct statement O It involves the reduction of aluminium O CO is used as a reducing agent to reduce sodium meta aluminate to aluminium O CO being weak acid is used to reduce the pH to increase the rate of precipitation of Al OH 3 from sodium meta aluminate In place of CO2 CO can also be used

a oxidation In the context of redox reactions the removal of hydrogen from a substance is known as a oxidation b dehydration d hydrogenation c reduction 17 During rainy season power supply to our home from the electric pole will be interrupted due to forma tion of metallic oxide layer on the electric wire This is b reduction a oxidation type of reaction c redox gas c hydrogen 18 For the preservation of chips packets are filled with a oxygen b carbon dioxide act statement from the following d None d nitrogen d home from the electric pole will be interrupted due to

On the basis of following graph P V graph choose the correct statement A Total work done W q B The entropy change for the overall process is zero C For the overall process AH AU D Total work 620 77 J 1 0 P atm 0 5 A B C 20 40 Volume lit

Questions 1 2 refer to the following information A survey was conducted among a randomly chosen sample of people who owned a cell phone in 2013 The following table shows a summary of the survey results 15 to 29 year olds 30 to 44 year olds 45 to 59 year olds 60 year olds and over Total Owned a Smart Phone Did Not Own a Smart Phone No Response Total 28 542 58 881 19 116 24 308 66 838 33 116 11 960 39 914 1 023 3 782 74 641 169 415 21 405 1 897 66 726 11 223 9 414 6 549 862 28 048 1 According to the survey results for which age group did the greatest percentage of people report that they owned a Smart Phone A 15 to 29 year olds B 30 to 44 year olds C 45 to 59 year olds D 60 year olds and over 2 Of the 15 to 29 year olds who reported owning a Smart Phone 500 people were selected at random to do a follow up survey in which they were asked whether they watched streaming videos on th There were 302 people in this follow up survey who responded Yes to the question and 198 who responded No Using the data from both the follow up survey and the initial survey which of the followin the likely to be an accurate statement A About 45 083 people 15 to 29 years old would report watching streaming videos on their Smart Phones B About 35 564 people 15 to 29 years old would report watching streaming videos on their Smart Phones C About 17 239 people 15 to 29 years old would report watching streaming videos on their Smart Phones D About 102 327 people 15 to 29 years old would report watching streaming videos on their Smart Phones