General Questions and Answers

Which one of the following pairs of solution is 52 not an acidic buffer 1 CH COOH and CH COONa 2 H CO and Na CO3 3 H PO and Na PO 4 HCIO and NaCIO fafafed face 1 CH COOH 7 CH COONa 2 H CO Na CO3 3 H PO N PO4 4 HCIO N CIO

4 None of these 40 mL of 0 1 M ammonia solution is mixed with 57 20 mL of 0 1M HCl What is the pH of the mixture pK of ammonia solution is 4 74 1 4 74 2 2 26 3 9 26 4 5 00 4 40 ft 0 1 M 3 faca 20 feft 0 HCI er pH 374 facra feg pk 4 74 1 4 74 2 2 26 3 9 26 4 5 00

Solubility products of Al SO4 is given by the 49 expression 1 K A1 SO 2 K A1 SO 1 3 K AI 1 SO 21 4 K A1 So Al SO4 fact 1 K A1 S2 2 K A1 So 1 3 K A1 SO 1 4 K A1 So Telegram ne questionpape

What is the percentage degree of hydrolysis approx 56 N of KCN in solution when the dissociation 80 constant for HCN is 1 6 10 and K 10142 1 5 26 2 2 24 3 8 2 4 None of these 80 KCN HCN F fer 1 6 10 g Kw 10 4 1 5 26 2 2 24 3 8 2 4

3 Two platinum electrodes were immersed in a solution of CuSO and electric current was passed through the solution After some time it was found that colour of CuSO4 disappeared with evolution of gas at the electrode The colourless solution contains 1 Platinum sulphate 3 Copper sulphate 2 Copper hydroxide 4 Sulphuric acid

Calculate the mass of N that is dissolved in the water inside a 240 L home aquarium at 297 K Atmospheric pressure is 1 02 bar the Henry s law constant KH for N at 297 K is 6 20 10 4 mol L bar the molar mass of N is 28 00 g mor and the atomosphere is 78 09 N2 33 3 g O 4 27 g O 4 27 10 2 g O 5 47x10 3g 03 330

4 12 04 10 mol What will be the molarity of a solution which 55 contains 5 85 g of NaCl s per 500 mL 1 4 mol L 2 20 mol L 3 0 2 mol L 4 2 mol L 12 04 x 10 mol cal f ff 500 mL 4 3 5 85 g NaCl s 1 4 mol L 2 20 mol L 3 0 2 mol L 4 2 mol L

52 During the electrolysis of fused NaCl which reaction occurs at anode 1 Chloride ions are oxidized 2 Chloride ions are reduced 3 Sodium ions are oxidized 4 Sodium ions are reduced

For the cell reaction Mg s 2 Ag aq Mg2 aq 2 Ag s E 3 17 V at 298 K The standard Gibb s free energy cell change for the cell reaction is O 611 8 kJ mol O 514 2 kJ mol O 870 2 kJ mol 290 4 kJ mol

The conjugate base of H PO4 is 1 H PO 2 H PO4 3 HPO 4 PO ALLEN 86 H POgre 1 H PO4 3 HPO 2 H PO4 4 PO

The infrared spectrum of a diatomic molecule exhibits transitions at 2143 0 cm and 4260 0 cm corresponding to excitations from the ground state to first and second vibrational states respectively The value of the fundamental frequency cm for the molecule is B 2169 M A 2156 C 2182 2195

A certain saturated hydrocarbon effuses about half as fast as methan The molecular formula of the hydrocarbon a compound made up c only carbon and hydrogen is a C4H8 c C3H6 b C4H10 d C3H8

In lead chamber process for the manufacture of H SO NO is the homogenous catalyst 2SO O 2SO3 formation of the intermediate is indicated by 1 Brown coloured vapours 3 Violet coloured vapours 2 Green coloured vapours 4 Light yellow coloured vapours

The solubility of electrolytes MX MX and 60 fa electrolytes MX MX MX MX is 1 x 103 moles per litre Hence their factar 1 x 10 respective solubility products are 1 10 4 x 10 27 10 2 2 10 4 x 10 27 10 2 X 3 10 8 x 108 32 10 2 4 None of these factual qu 1 10 4 x 10 27 10 2 2 10 4 10 27 10 2 3 10 8 x 108 32 10 2 4 tolo nepap

Two moles of an equimolar mixture of two alcohals R OH and R OH are esterified with one mole of acetic acid If only 80 of the acid is consumed till equilibrium an the quantities of ester formed under equilibrium are in the ratio 3 2 What is the valu of equilibrium constant Kc for the esterification of R OH A 0 48 B 3 69 C 2 2 D 4 61

Conduction in a p type semiconductor is increased by a increasing the band gap b decreasing the temperature c adding appropriate electron deficient impurities d adding appropriate electron rich impurities

Heat of dissociation of CH COOH is 0 005 kcal g hence enthalpy change when I mol of Ca OH is completely neutralised by CH COOH is a 27 4 kcal c 26 8 kcal b 13 6 kcal d 27 1 kcal

2 Sodium bicarbonate on heating decomposes to form sodium carbonate CO and water If 0 2 moles of sodium bicarbonate is completely decomposed how many moles of sodium carbonate is formed J K CET a 0 1 b 0 2 c 0 05 d 0 025

One mol of an organic compound A containing C H N on reaction with excess HNO liberates 44 8 litres of N N T P and on reaction with ammoniacal AgNO gives a white ppt containing 108 gm of silver Two moles of A eaction with excess MeMeBr produces methane gas whose volume measured at N T P will be B 112 litre A 224 litre C 89 6 litre D 179 2 litre

84 ALLEN Which of the following does not give a 84 disproportion reaction 1 P NaOH 2 S NaOH

Enthalpy of solution of BaCl and BaCl 2H O are x and y kJ mol respectively The enthalpy of hydration of BaCl to BaCl 2H O is 1 x y kJ 2 y x kJ 3 x y kJ 4 x y kJ

Comprehension 3 Electronegativity is a feature which is relative and depends on several factor like oxidation numbe hybridizations etc For instance the electronegativity of differently hybridized carbon are sp sp 2 sp 39 10 2 99 2 66 2 48 Which of the following contain all carbon of equal electronegativity A Propene B Propadiene C Cyclopropene Which of the following is correct H C CH H C CH HC CH c a b A The C C abond is of equal strength in a and b B The C C a bond is stronger in a than c D Cyclopropane

3Mn OH 2 s 2MnO 4 aq 5Mn02 s 2H20 20H n factor for Mn OH 2 is 2 n factor for Mn OH 2 is 3 n factor for Mn0 4 is 2 n factor for Mn0 4 is 3 How we calculate the n factor of this q I

repulsion 3 Volume of molecule 4 Radius of molecule Consider the ground state of Cr atom Z 24 67 Total number of electrons with azimuthal qunatum number 1 and 2 are 1 17 2 20 3 18 4 19 2 Sargen sich f 3 3 34 4 3fan fro Cr 44 Z 24 1 17 fal den en fand fax farisht ar 2 2 20 3 18 4 19

8 cards and 8 envelopes are numbered 1 1 2 3 4 5 6 7 and cards are to be placed in envelopes so that each envelope contains exactly one card and no 6 9 21 21 42 card in the envelope bearing the same number 2 0 Also cards and nu envelopes of same number no 10 of ways in which 2715 2433 are identical Then find the it can be done

An unknown sample was dissolved in water and made of titrate with 0 1 M HCI solution initially using phenophthalein indicator The volume of HCI consumed was found to be V ml Then to the resulting solution methyl orange indicator was added and again titrated with same HCI solution The volume of HCI consumed now was found to be V ml If V VM then the unknown sample might not contain M A only Na CO3 B equimolar mixture of NaOH Na CO and NaHCO C equimolar mixture of NaOH and NaHCO D equimolar mixture of NaOH and Na CO3

Two different electrolytic cells filled with molten 56 a fuff Cu NO and molten Al NO respectively are connected in series When electricity is passed 6 35 gm Cu is deposited on electrode Calculate the weight of Al deposited on cathode Cu 63 5 Al 27 g mol 1 180 gm 2 9 525 g 3 1 8 gm 4 31 75 g Cu NO a fagauri varsa for T 63 5 Al Cu NO gst at 6 35 gm Cu A VE SOUL SI Aferul 27 g mol 1 180 gm 2 9 525 g 3 1 8 gm 4 31 75 g

Na S O3 is used in the bleaching industry to destroy any excess Cl on fabric after they have been passed through a bleach bath 15 8 g of Na S O react with 30 4 g of Cl in excess of H O then the mass of sulphur containing compound formed due to this reaction is x g This sulphur containing compound is acid salt The value of is Options Correct Answer 6 Solution Answer 6 Na2S2O3 4 Cl 5 H O2 NaHSO4 8 HCI Na2S O3 4Cl2 5H O 2NaHSO4 8HCI Excess Mole of Na2S2O3 15 8 158 0 1 mol Mole of Cl 0 428 Na2S2O3 Limiting reagent Mol of NaHSO4 2 mol of Na2S O3 0 2 0 2 mol of NaHSQ 24 g User Answer 9

In the quantitative determination of nitrogen N gas liberated from 0 42 gm of a sample of organic 100 11 2 compound was collected over water If the volume of N gas collected was 860 mm Hg at 250 K by mass of nitrogen in the organic compound is Aq tension at 250 K is 24 mm Hg and R 0 08 L atm mol K 10 A 3 5 B 3 C 20 3 D 100 3 ml at total pressure

A and B are two volatile liquids with their vapour pressure P 340mm of Hg and 120mm of Hg at 25 C To a flask containing 8 mole of A 5 mole of B was added As soon as B was added A starts associating to form a non volatile solid A solid which is soluble in both liquids A and B The association of A follows 1 order kinetics The vapour pressure of solution measured after 1 hour is 360 mm of Hg and after very long time it is 300 mm of Hg Identify correct statements s The fx R

Multiple Choice Questions with ONE correct answer 1 Dilution processes of different aqueous solutions with water are given in LIST 1 The effects of dilution of the solutions on H are given in LIST II Note Degree of dissociation a of weak acid and weak base is 1 degree of hydrolysis of salt 1 H represents the concentration of H ions LIST I LIST II P 10 mL of 0 1 M NaOH 20 mL of 0 1 M acetic 1 the value of H does not change acid diluted to 60 mL on dilution Q 20 mL of 0 1 M NaOH 20 mL of 0 1 M acetic 2 the value of H changes to half of its initial value on dilution acid diluted to 80 mL R 20 mL of 0 1 M HCI 20 mL of 0 1 M ammonia 3 the value of H changes to two solution diluted to 80 mL times of its initial value on dilution 61 S 10 mL saturated solution of Ni OH 2 in equilibrium 4 the value of H changes to with excess solid Ni OH 2 is diluted to 20 mL solid 1 times of its initial value on dilution Ni OH 2 is still present after dilution 2 5 the value of H changes to 2 times of its initial value on dilution Match each process given in LIST I with one or more effect s in LIST II The correct option is A P 4 Q 2 R 3 S 1 B P 4 Q 3 R 2 S 3 C P 1 Q 4 R5 S 3 DUR 1 05 R 4 S 1 2018

ALLEN 40 ml of 0 2 M BaCl is mixed with 40 ml of 0 3 60 M Na SO4 solution What is the concentration of SO ion in the final solution 1 0 4 M 3 0 5 M 2 0 2 M 4 0 05 M 0 2 M BaCl a 40 ml 727 0 3 M Na SO i 40 ml af fa arfi 1 0 4 M 3 0 5 M 2 0 2 M 4 0 05 M

lowing characters Property Appearance Conduction of heat Malleability Ductility Metal Non Metal Write one word for the following Materials having properties of both metals and non metals The property of metals due to which they produce sound The property of metals due to which they can be beaten into sheets Nature of metal oxides is The property of metals by virtue of which they can be drawn into wires

Which of following is correct option 1 Density Na K 2 Partial negatively charged hydrogen is present in CH 3 Ba metal will give apple green colour on Bunsen flame 56 Affet fa 1 Na K 2 CH I Buftera 3 Bad at the in Zaft 1

Match the metal given in Column A with its medicinal use as a compound in Column B Column B OKO Column A A Gd B Au C Pt D Li Tom I Cancer II Maniac depression III MRI contrast agent IV Arthritis celest 8 ba

The di cationic form of the lysine is NH CH 5 CH 1 5 8 2 7 3 6 35 CH COOH 4 9 75 for lysine the value of PKa PKa2 and pka3 are 2 2 9 0 and 10 5 respectively The pH at the isoelectric point of lysine is NH3

62 3 50 4 75 The equivalent weight of KMnO in given redox 62 reaction is 2KMnO K MnO MnO 0 MKMnO 5 1 3 MKMnO 2 MKMnO 2 4 MKMnO 3 3 50 KMnO 2KMnO K MnO MnO O 3 2 25 4 75 a traff MKMnO 2 MKMnO 2 MKMnO 5 MKMnO

2 Volume occupied by one molecule of wate density 1 g cm3 is AIPMT Prelims 2008 1 5 5 x 10 23 cm 2 9 0 10 23 cm 3 6 023 10 23 cm 4 30 x 10 23 cm

Which one of the following solutions will exhibit 65 highest boiling point 1 0 05 M glucose 2 0 01 M KNO 50 3 0 015 M Urea 4 0 01 M Na SO 75 siast Leader Achiever ALL PHASE fac 1 0 05 M 2 0 01 M KNO 50 3 0 015 Ma 4 0 01 M Na SO a 75

9 A partially dried clay mineral contains 8 water The original sample contained 12 water and 4 5 silica The of silica in the partially dried sample is nearly 1 50 2 49 3 55 4 470

AL For the reaction 2N O g 4NO g O g If 50 the concentration of O increases by 2 10 M in 100 seconds then the rate of disappearance of N O is 1 4 x 10 Ms 3 4 10 Ms 2 1 x 10 Ms 4 2 10 Ms ff 2N O g af 100 sec 0 Brat N O faciat 1 4 x 10 Ms 3 4 10 Ms 4NO g O g fer 210 M 2 1 10 Ms 4 2 10 Ms

4 2 53 10 H atoms The density of a gas is 0 714 g dm at 273 K 59 and 76 cm of Hg The gas is 1 CH 3 CO 2 C H 4 Xe t Leader Achiever Course ALL PHASE 50 4 2 53 x 10 H atoms 273 K 76 cm Hg 0 714 g dmt at het 1 CH 3 CO 2 C H 1 Xe 1001CMD363119111

3 In the reaction of 0 220 g lithium with 200 g HCI solution which is in excess the temperature of the solution increases by 10 5 C Assume a heat capacity of 4 18 J g C and 200 0 g of solution Calculate the AH in kJ

Choose the correct alternative A trader defrauds both his supplier and customer using a faulty weighing machine He takes 20 more than the indicated quantity while buying from the supplier While selling the customer he gives the customer a weight such that if the weight given to the customer is increased by 10 then the weight claimed by the trader is obtained Find his pro percentage Assume that he sells the product at the cost price O 30 33 33 O 32 O Cannot be determined

On Fig 4 1 draw another ray from point A to locate the image of point A Label this image 1 d On the ray diagram in Fig 4 1 the refraction is shown occurring at the centre line of the lens State where the refraction actually occurs

3 A B 4 A B A diatomic gas belonging to group 15 combines 61 with a halogen to form a trihalide which is fairly stable and inert The trihalide is 1 NCI 3 BiF 2 PCI 4 NF A703 2 AB 4 A B 3 A B 4 van faccentuare the furat t at an af starts a rents t 1 NCI 3 BiF 2 PCI 4 NF

1 12 4 2 13 3 3 11 4 4 12 95 How many hydrogen atoms are present 58 in 0 35 moles of C6H12O6 Given N 6 023 10 X 1 2 53 10 H atoms 2 2 53 102 H atoms 3 2 53 x 10 H atoms 4 2 53 10 H atoms 1 12 4 3 11 4 0 35 C H O Juftera 2 f N 6 023 10 1 2 53 10 H atoms 2 2 53 10 H atoms 3 2 53 10 H atoms 4 2 53 10 H atoms 2 13 3 4 12 95 far

In IR spectroscopy the fingerprint region extends from ans 1250 800 cm 1250 500 cm 1 1350 1000 cm 1500 600 cm

A phosphate group in DNA is linked with 3 carbon and 5 carbon of two different deoxyribose sugar 3 carbon of two different deoxyribose sugar 5 carbon of a deoxyribose sugar and 7 carbon of a purine base 3 carbon of a deoxyribose sugar and 5 carbon of ribose sugar

The molar concentration of chloride ion in a solution made by adding 300 ml of 3 0 M KCI solution to a 200 ml of 4 0 M BaCl2 solution will be Question Type Single Correct Type 1 2 3 5 0 M 1 8 M 1 6 M