General Questions and Answers

mixture of KOH 56 and K CO3 138 is dissolved in water and separated into two equal parts by volume One part required 50 mL 0 1 M H SO to reach the phenolphthalein end point while the other par required 75 ml of the same acid to reach the methyl oragane end point The mass percentage of K CO i the mixture is A 35 5 B 71 D 64 5

What is the dimensionality of an NMR spectrum resulting from a pulse program with 3 evolution periods and one detectionperiod And how many Fourier transformations of the time domains are necessary to obtain the frequency domains

Pick out terms from the given pool of words and label the given diagram Burning of candle Condensation Melting of wax Boiling Evaporation Water droplet Contraction Melting Burning of Candles

In order to increase the volume of a gas by 10 the pressure of the gas should be A Decreased by 10 Wrong Answer B Decreased by 9 09 Correct Answer C Increased by 10 R Increased by 1

sp 5 A saturated solution of MX is prepared K of MX is a 10 b If 10 7 mol of MNO3 are added in 1 L of this solution conductivity of this solution is 55 10 7 Sm A 6 10 S m mol M A 8 10 NO 7 10

Chemical formula of Aluminium Sulphate is 1 2 Al2 2 SO4 3 3 Al SO 8gr of Mg contain 1 0 3 2 Latin word for water is 1 3 3 hydro 2 OXY 3 Valency of carbon is 1 1 2 2 2 3 3 The Valency of copper in Cu O is moles 2 4 helios 4 4 Al SO4 3 4 0 2 4 none Al

12 25 3 g of sodium carbonate Na CO3 is dissolved in enough water to make 250 mL of solution If sodium carbonate dissociates completely molar concentration of sodium ion Nat and carbonate ions CO are respectively Molar mass of Na CO3 106 g mol a 0 955 M and 1 910 M b 1 910 M and 0 955 M c 1 90 M and 1 910 M ar 0177 M and 0477 M Prelims 2010

33 20 mL of 0 2 M NaOH is added to 50 ml of 0 2 M acetic acid to give 70 ml of the solution Calculate the additional volume in mL of 0 2 M NaOH required to make the pH of the solution 4 74 The ionization constant of acetic acid is 1 8 x 105 Use log 1 8 0 26

3 Conductive cell has resistance 2202 when fill by 0 1m CH3COONa 7 392 when fill by 0 1M CH3COONa 0 2M HCI and 1 692 when using 0 1M NaCl solution and ANaCl 126 give a Cell constant

8 9 Oxygen molecule formula is 1 20 2 0 3 0 4 0 When the particles of a substance contain only one type of atoms that substanc is called element 3 compound 4 atom 1 Molecule 2 Symbol of Argon is 1 Ag 2 Ar 3 An 4 A

When O3 gas and SO gas are mixed in xy molar ratio the average vapour density of mixture is 29 6 then the average molecular mass of mixture which is prepared by mixing O3 and SO2 gases in yx ratio is Atomic mass O 16 S 32 A 26 4 B 52 8 C 56 D 50 8

Two students are arguing about whose experiment went best Student A mentions the GC had a ratio of 95 and 5 starting material and the IR was a 90 match Student B saw that the IR had 98 on the match and the GC was 94 6 product to starting material Who had the better more pure product Student A They both had the exact same result Student B Neither bhad a better result

react how many mol of O could be produced 0 1 8 32 16 Question 32 2 points Hydrogen peroxide reacts to form water and oxygen gas H O aq H O 1 O g If 32 2 g of O are produced from this reaction how grams of H O would also be produced 16 1 g 64 4 g 72 0 g

112ysin 0 3 2v cos 2 vain 0 2 4 v cos0 2 Aplane mirror roatating at an angular of 3 radian s reflects a light beam The angular of the reflected beam is 3 9rad s 4 12rad s velocity 13rad s Two candles initially of equal height h are distance at a distance of a from each other The between each candle and the nearest wall is also a With what speed the shadow of the left side candle will move along the left wall if left side candle burns down in the time and the right side in the time 1 a 1112 4 24 4 1 1 2 a h 11 Your idem vertically shown in midpoin reflectic 21 1 h 4 12 1 3 12 F 3142 1 Following figure shows the multiple reflections of a light ray along a glass PAR 11 1

3 Calculate the excess air coefficient by writing the combustion equation since the dry based exhaust gas components measured by the exhaust emission device of an engine running on gasoline CSH15 are 14 29 CO2 60 637 CO 60 0217 CSH15 0 65 02 60 2029 NO by volume M 29 kg kmol y fast answer pleaseee

E Which buffer system below is best equipped to maintain a pH of 7 0 25 C A 25 mM Tris HCI buffer pKa 8 08 B 50 mM Carbonate buffer pKa 6 37 C 10 mM HEPES buffer pKa 7 55 D 50 mM Phosphate buffer pKa 6 86 E 100 mM Acetate buffer pKa 4 76

The degree of hardness of a water sample is found to be 100 ppm 50 of hardness is temporary hardness due to Ca HCO3 2 If weight of slaked lime in mg required to remove completely the temporary hardness in 1 litre of that water sample is x Then the value of X 3 is 10

4F Show with equations and text how you would calculate the pH for seawater S 35 t 25 C that is in equilibrium with calcium carbonate aragonite if the alkalinity of the seawater is 2221 60 micromoles kg

a Please write ODEs to describe this system following the Laws of Mass action There should be 5 equations one for each species present in this system for example d A dt A L u ALC KLA KAL KAB KBA KBLC KALC B L KLB BLC KBL Y Inactivated receptor Y Activated receptor

Using transition state theory estimate the rate constant for a reaction where the two reactants are diatomics and the transition state is non linear Assume hard sphere collision limit and that the reaction is occurring at room temp Also assume that the vibrational levels of all species are widely spaced and there is no degeneracy in the electronic states of the system

EXAMP The activity of 1 g of radium is found to be 0 5 curie Calculate the half life period of radium and the time required for the decay of 2 g of radium to give 0 25 g of radium atomic mass of radium 226 1023

Different alternating voltages are given below In which case the peak value and rms value are same a Vol V c V b 0 Vol d A M V Vol TV V VI 1 c only 2 d only

V An 7 Values of x y and z respectively for the balanced redox reaction are P s x OH aq yH O l ZPH 3H PO 1 3 3 1 2 3 3 3 3 1 3 3 4 3 1 3

Mixture A is 10 ethanol by volume and mixture B is 30 ethanol by volume How many milliliters of mixture B must be added to 200 milliliters of mixture A to create a mixture that is 25 ethanol by volume 600 480 400 500 530 680

What volume of 6 M HCI and 2 M HCI should be moved to get two litre of 3 M H Let the volume of 6 M HCI required to obtain 2 L of 3M HC xL Volume of 2 M HCl required 2 x L

Assertion Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as 02 Reason Oxygen forms pt pt multiple bond due to small size and small bond length but pt pt bonding is not possible in sulphur A Assertion Molarity of a solution in liquid state changes with temperature R Reason The volume of a solution changes with change in temperature

A student has 470 0 mL of a 0 1246 M aqueous solution of Na CrO4 to use in an experiment She accidentally leaves the container uncovered and comes back the next week to find only solid residue The mass of the residue is 20 04 g Determine the chemical formula of this residue f the substance is a hydrate use a period instead of a dot in its formula

Estimate the pressure for hydrate formation at 55 F for the gas with following composition 92 67 methane 5 29 ethane 1 38 propane 0 182 i butane 0 478 n butane Using the Katz equilibrium Method

22 Match the Column I with Column II Column I A N 1 mol B 02 1 mol C CH4 1 mol D H O 1 mol Column II p 10 mol electrons q 8 mol protons r 6 023 1022 electrons s 10 mol protons

37 Assume 2 2 x 10 17 J of light energy is needed by the interior of human eye to see an object How many photons of yellow light with 612 nm ar needed to generate the minimum energy Use Planck s constant 6 6 x 10 34 Js an of light 3 108 m s

Acidified water is electrolysed using an inert electrode The volume of gases liberated at STP is 0 168 L The quantity of charge passed through the acidified water is x C The value of is 1 F 96000 C X 10

ii Calculate the amount of lime and soda required to soften 50000 L of the water sample containing Mg HCO3 2 158 mg l Ca HCO3 2 mg L MgSO4 60 mg L CaC12 25 mg L MgCl2 35 mg L NaCl 20mg L respectively answer only ii

A compound formed by elements A and B crystallises in the cubic structure where A atoms are at comers of a cube and B atoms are at face centres The formula of the compound is a AB3 c AB2 b A2B d A2B3 1

46 Among the following the number of compounds than can react with PCI to give POCI is O CO SO H C H SO4 P4010 IIT JEE 2011 Paper 2

4 There is an uncertain relationship between the position of a system and its moment By For example in one dimension there is an uncertainty principle between position x and moment in x px Therefore the commutator of the position and moment operators must be zero

I Integer Answer 17 105 mol of pure water is saturated with NH3 gas producing a solution of density 0 9 g m 500 solution contains 30 of NH3 by weight and final volume of solution is ml then what

1 The dissociation equilibrium of a gas AB can be represented as 2AB g 2AB g B g The degree of dissociation is x and is small compared to 1 The expression relating the degree of dissociation x with equilibrium constant Kp and total pressure P is AIPMT Prelims 2008 1 3 Kp KP 2Kp P 1 3 2 4 2Kp P 2Kp P 1 2

39 If m is the mass of an electron h is the Planck s constant and a is the radius of first orbit of H atom then kinetic energy of electron in the third orbit of He ion is given by value of x is h m X The

20 A test cross of F flies a b produced the following offspring ab 5 ab ab 5 b ab 45 a ab 45 What will be distance between linked gene 1 82 CM cis 2 20 CM trans 3 10 cM cis

A gas follows an equation of state that is given below Figure 1 The equation of state for a real gas PVm RT 8 7 RTP 1 4tr 57 A Find the equation for its critical pressure Pc B Find the equation for its critical volume Vc C Find the equation for its critical temperature Tc D Find the equation for its Boyle s

3 2 The three thermodynamic states P Q and R of a system are connected by the paths shown in the figure given on the right The entropy change in the processes PQ Q R and PR along the paths indicated are ASPQ ASQR and ASPR respectively If the process P Q is adiabatic and irreversible while P R is adiabatic and reversible the correct statement is A ASQR 0 B ASPR 0 P C ASQR 0 Q D ASPQ 0 R

c A unit cell of BaCl fluorite structure is made up of a four Ba2 ions and four Cl ions c eight Ba ions and four Cl ions b four Ba2 ions and eight Cl ions d four Ba ions and six Cl ions

Match the Following Match the Column I with Column II Column I N 5 CO C6H12O6 CH COOH Column II p 40 carbon by mass q Empirical formula CH O r Vapour density 14 s 14N N 6 023 x 1023 electrons in a mole

C mg 4 g A solution of 0 1 M of a metal chloride MCI requires 500 mL of 0 6 M AgNO3 solution for complete precipitation The value of x is B 2 A 1 C 4 D 3 molecul A 3 C 2 83 Two ox metal D oxide is A MO

6 moles of electrons are passed through acidulated water the moles of gas discharged is x Then 2 x is nswer 0 lect your ang 01 02 0 3 04 05 06 07 08 09

What is the approximate pH of a solution composed of 0 2 M tyrosine and 0 02 M HCl Assume you are protonating the carboxyl group The three pK s for tyrosine are 2 2 9 1 and 10 1 side chain pK

33 What is correct for 10 g of CaCO A It contains 1 g atom of carbon B It contains 0 3 g atoms of oxygen C It contains 12 g of calcium D It refers to 0 1 g equivalent of CaCO3 Which of the following is not correct regarding

When 2 96 gm gaseous mixture of C H and C H gases is burnt completely in excess of O gas 8 8 gm CO and 5 04 gm H O vapours are formed The correct information s related with the initial mixture is lare A Equal moles of both the gases were taken B Equal masses of both the gases were taken C Mass ratio of C and H atoms is 30 7 D The total mass of oxygen used in combustion was 10 88 gm

Can electrons and protons be changed into neutrons like in neutron stars by any proces s and if so when and if it happens what wou Id be the structure of atom and could electri city flow through them and why does it hap pen

A mixture containing 2 0 mol each of H and O2 is ignited so that water is formed The amount of water formed is B 36 0 g D 3 60 g A 18 0 g C 1 80 g 1 2 g of Mg At mass 24 will produce MgO A F C 82 The most