General Questions and Answers

For electrolyte AxBy The relation between vant hoff factor and degree of dissociation can be given as i 1 x y 1 i 1 a xa ya 1 i 1 x y a a All of these Marks 4 1

Select the incorrect statement among the following regarding photoelectric effect E There is no time lag between the striking of light and ejection of electrons The number of ejected photoelectrons do not depend upon the frequency of light Below the threshold frequency the photoelectrons cannot be ejected The kinetic energy of photoelectrons is proportional to the intensity of light

The freezing point depression of a 0 1 M aq solution of weak acid HX is 0 20 C What is the value of equilibrium constant for the reaction HX aq H aq X aq Given K for water 1 8 kg mol K Molality Molarity A 1 46x10 C 1 21x10 B 1 35x10 D 1 35 10

The enthalpy of dissolution of BaCl2 s and BaCl2 2H O s 1 are 20 6 and 8 8 kJ mol respectively The enthalpy of hydration for BaCl2 s 2H O BaCl 27 A 45 8 kJ B 29 4kJ C 11 8 kJ D 38 2 kJ

Passage of three faraday of charge through aqueous solution of AgNO3 CuSO4 Al NO3 3 and NaCl will deposit metals at the cathode in the molar ratio of b 6 3 2 6 d 3 2 1 0 a 1 2 3 1 16 3 0 0 the following h

Question Type Single Correct Type 1 Hydrolysis of XeF2 is redox process 2 PCI5 on complete hydrolysis yield H3 PO4 3 On Hydrolysis of XeF4 Xe XeO3 are obtained as products 4 On hydrolysis of H3PO3 H3PO4 PH3 are toined

Hydrolysis constants of two salts K and hA KB of weak acids HA and HB are 10 8 and hB 10 6 If the dissociation constant of third acid HC is 10 2 The order of acidic strength of three acids will be A HA HB HC B HB HA HC CHC HA HB D Correct Answer HA HB HC

2 14 Two tiny spheres carrying charges 15 C and 2 5 C are located 30 cm apart Find the potential and electric field a at he midpoint of the line joining the two charges and b at a point 10 cm from this midpoint in a plane normal to the line and assing through the midpoint

What is the proportion mole ratio of benzoic acid a monoacid chain capping agent that should be used with an equimolar mixture of adip acid and hexamethylene diamine to produce a polymer of 10 000 g mol at 99 5 conversion Again you can neglect end groups Select one O a 0 978 O b 0 944 OC 0 0186 O d 0 022 e 0 056

Select the incorrect option among the following e m ratio of proton is 1 758820 x 10 1 C g e m values of anode rays generated by discharge of different gases are different Millikan s oil drop experiment was used to calculate the charge on electron e m ratio of electron was determined by J J Thomson

A sample of 10 mol gas expands isothermally reversibly to double its volume from 1 L to 2 L The AU for the process is 00 O 20 L atm O 20 Latm O 10 Latm

Q 1 Tick mark the correct answer 1 The ratio of the sine of the angle of incidence to that of refraction is constant and it is the characteristic of a liquid This is a Lorenz s law d Maxwell law 2 Molar refraction has unit b Snell s law c Debye law

d Mg is precipitated 0 Normal Al AlCl3 coupled with normal hydrogen electrode gives an e m f of 1 66 V The standard oxidation electrode potential of aluminium is a 1 66 V b 1 66 V E Ea c 0 83 V d 0 83 V many faraday are needed to reduce a molec 4x2 1

Match incorrect equivalent mass of reactant in following column M molar mass of reactant Column I 1 FeS Fe SO 2 P H P H PH 3 2Mn7 Mn Mn 6 4 Ba MnO H Mn Column II M 15 5M 6 M 3 M 5

The boiling point of C6H6 CH3OH C6H5NH and C6H5NO are 80 C 65 C 184 C and 212 C respectively Which will show highest vapour pressure at room temperature 1 C6H6 2 H NH 2 CH OH 4 CH NO

Which of the following reaction is endothermic reaction 1 Bond formation by two unstable atoms at certain condition 2 Combustion reactions 3 Conversion of more stable allotrope to less stable allotropic element 4 Condensation of vapour to its liquid state

Answer B Your Attempt A a b are constants for a gas at any temperature and pressure Correct answer D a b are not strictly constants and vary with temperature and pressure C The values of a b are same according to different equations for real gases For real gases TB where To is the Boyle s temperature Rb Rate

An aqueous solution contains 0 26 M ammonium nitrate One liter of this solution could be converted into a buffer by the addition of Assume that the volume remains constant as each substance is added 0 25 mol NH3 0 06 mol Ba OH 0 26 mol HCIO4 0 12 mol HC104 10 25 mol Ca NO3 2

0 1 M glucose Which of the following solution will exhibit highest boiling point 0 1 M NaCl 0 1 M CaCl TK TOT Review 0 1 M AICI 3 hr m

On dissolving sugar in water at room temperature solution feels cool to touch Under which of the following cases dissolution of sugar will be most rapid A Sugar crystals in cold water B Sugar crystals in hot water C Powdered sugar in cold water D Powdered sugar in hot water Medium The web pages from your last visit have not Feedback

3 a 8 25 g cm c 42 5 g cm 3 MCS d 0 425 30 If NaCl is dopped with 10 mole of SrCl2 concentration of cation vacancies will be the a 6 02 x10 6 mol 1 c 6 02 x10 4 mol 1 AIPMT 2007 b 6 02 x10 mol 1 d 6 02 10 5 mol 1 JAIPMT 2007 ion of total volume occupied by the atoms

If for a reaction in which A g converts to B g the reaction carried out at const V T results into the following graph PB A Time 1 then the reaction must be A g 3B g and is a first order reaction Partial Pressure O PA 2 then the reaction must be A g 3B g and is a second order reaction 3 then the reaction must be A g 3B g and is a zero order reaction 4 then the reaction must be A g 3B g and is a first order reaction

The hardness of water sample containing 2 x 10 3 g of CaCO3 dissolved in 1 L of water is expressed as 20 ppm 2 ppm 200 ppm hr 0 2 ppm

Unit of Kc for the equilibrium 4 NH3 g 5 O g 4 NO g 6 H O g is mol L 1 L mol 1 mol5 L 5 L5 mol 5

If A H for the reaction N 3 H 2 NH3 is a then A H fo 1 3 NH3 N2 H is the reaction NH3 a a N BIN 2 2 a

PROBLEM 414 Carbondioxide gas from a steel cylinder is bubbled for some time through pure water placed in a jar When the supply of gas is terminated pH of the solution was found to be 3 83 What is the pressure of gas in the cylinder if Henery s constant of CO is 2 3 x 102 For CO K 4 2 x 107 and K 4 8 10 1

1 5 M aqueous solution of acetic acid in water has density 0 9 g mL The molality of the solution will be 1 51 molal 1 02 molal 2 01 molal 1 85 molal

The following equilibrium for the dissociation of oxide of nitrogen are given with its Ke at T C 2NO g N g 20 g Kc 6 7 10 6 2N O5 9 2NO g 2N O g 2N g O g Kc 10 1 Which of the following oxide is most stable according to the given K values NO 2N g 50 g Kc 1023 N g O g Kc 2 102

Which one of the following statements regarding helium is incorrect is used to fill gas balloons instead of hydrogen because it is lighter and non inflammable 2 It is used as a cryogenic agent for carrying out experiments at low temperatures 3 It is used to produce and sustain powerful superconducting magnets 4 It is used in gas cooled nuclear reactors

Which of the following reactions occur at the cathode during the charging of lead storage battery 1 PbSO4 s 2e Pb s SO 4 2 Pb SO 3 Pb Pb 2e 1 PbSO 2H O PhQ 4H SO 2e SO PbSO4

9 A hypothetical electrochemical cell is shown below A A xM B M B The e m f measured is 0 20 V The cell reaction is AIPMT 2006 a The cell reaction cannot be predicted b A B A B c A BA B d A e A B B

An drug organic compound which described as a pain relief medication is consist of 15 51 Oxygen 75 69 Carbon and 8 80 Hydrogen by mass Estimate the empirical formula of this drug C6H90 C7H902 C13H180 None of them O C13H1802 O C7H90

Enthalpies of combustion of propane butane and pentane are 2220 2878 3537 kJ mol respectively Order of calorific value per gram of fuel will be 1 Propane Butane Pentane 2 Butane Pentane Propane

The wave function of any hydrogen like specie for the orbital 2s is given by 4 2s 1 2 2 z 0 x 2 ao 3 2 3 1 587 A where Zr ao a is 0 529 Hence the radius for nodal surface of 2s orbital for Het is given by 1 0 529 xe 3 2 2 1 058 0 829 4

c 14 d 3 114 Graphite is a soft solid lubricant extremely difficult to melt The reason for this anomalous behaviour is that graphite a is a non crystalline substance b is an allotropic form of diamond c has molecules of variable molecular masses like d has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds

4 Some of the following gases are soluble in water due to formation of their ions 1 00 II NHs III HCI IV CH4 V H2 Water insoluble gases can be A LIV V B I V C I II III D IV V portial pressure is

b Hide hint for Question 19 If you need to write N N PJ

PRN 1171814889 NOTE SCREENSHOT PROHIBITED System of review measures A B C Testing of raw material Testing of intermediates

Find the odd man out a Tocantins c Roraima a Western part of Rajasthan c Western Andhra Pradesh a Evergreen forest c Temperate grasslands a Density of population c urban rural population b Rio Grande do sal d Amazonas b Gujarat d Eastern Maharash b Himalayan forest d deciduous forest b sex ratio d Human settlemer

21 What is the ratio of volume of 1 mole of nitrogen gas to 16 g oxygen gas at STP 1 1 0 5 2 1 0 92 3 0 92 1 2

c 6 03 x 1023 d 6 017 x 109 7 The unit cell cube length for LiCl just like NaCl structure is 5 14 Assuming anion anion contact the ionic radius for chloride ion is a 1 815 c 3 8 A b 2 8 A d 4 815 A temperature 18 10 Fcc sodium crystallizes in a bo 120 The theoret

Consider the Arrhenius equation given below and mark the correct option k Ae Ea RT i Rate constant increases exponentially with increasing activation energy and decreasing temperature ii Rate constant decreases exponentially with increasing activation energy and decreasing temperature iii Rate constant increases exponentially with decreasing activation energy and decreasing temperature iv Rate constant increases exponentially with decreasing activation energy and increasing temperature

is 1 50 g mL what is its concentration A 11 4 mol L B 8 9 mol L C 5 9 mol L D 18 5 mol L Calculate the percent of BaO in 29 0 g of a mixture of BaO and CaO which just reacts with 100 8 mL of 6 00 M HCL BaO 2HCl BaCl H O CaO 2HCl CaCl H O Calculate the amount of 95 pure Na CQ required to prepare 5 litro of 0 5 Maluti

4 CH CHCICOOH In a solid AB having the NaCl structure A atoms occupy the corners of the cubic unit cell all the face centered atoms along one of the axes are removed then the resultant stoichiometry the solid is 1 AB 3 A4 B3 4 A B 2 A B

An LPG cylinder contained 15 kg of butane gas at 27 C and 10 bar pressure The cylinder leaked and it was found that after 4 days the mass of the gas left in the cylinder was onl 10 kg How much drop in pressure has occurred in each day 0 52 bar 0 833 bar 1 6 bar 1 832 har

TYPE III VOLUME VOLUME RELATIO For complete combustion of 1 12 L of butane C H the produced volume of H O C IP STP will be 2 g 1 C4H10 g 1 12L Volum 13 2 13 202 g Volume of H O at STP 5 x 1 12 5 6 L 2 STR 4 A 4CO2 g A AO T 5 5H O g 2

Na CO can be manufactured by solvay process but K CO3 cannot be prepared because 1 K CO is more soluble 2 K CO is less soluble 3 KHCO3 is more soluble than NaHCO 4 KHCO is less soluble than NaHCO

4 n 2 to n 1 The increasing order of the rate of HCN addition to compound A D is A HCHO B CH COCH C PhCOCH D PhCOPh 2 D B C A 3 D C B A 4 C D B A 1 A B C D CH NH 0 12 mole pK 3 3 is added to 0 08 moles of HCl and the solution is diluted to

Match the following Column I A B C D 100 ml of 0 2 M AICI3 solution 400 ml of 0 1 M HCl solution 50 ml of 0 4 M KCl 50 ml H O 30 ml of 0 2 M K SO4 70 ml H O 200 ml 24 5 w v H SO4 p q r s Column II Total concentration of cation s 0 12 M SO42 1 0 06 M SO42 1 2 5 M CI 0 2 M

3 B B B Tribomo acid Which of the following sequences molecules 1 CIO OF OCL H O 2 OF H O OCI CIO 3 OCI CIO H O OF 4 H O OF OCI CIO CH C CHCOCH can be oxidized to CH C CHCOOH by 4 No reaction takes place represent the correct increasing order of bond angles in the giv