General Questions and Answers

47 100 mL of 0 1 N NaOH solution is required for neutralisation of 0 49 g of a dibasic acid What is the molecular weight of the acid a 49 b 98 c 490 d 196

21 CH CH CHO aq Na CO Produ Identify the product 1 3 Hydroxy butanal 2 3 Hydroxy 2 methyl pentanal 3 3 Hydroxy propanal 4 4 Hydroxy 4 methyl pentan 2 on

1 Which of the following does not characterise X rays a The radiation can ionise gases b It causes ZnS to fluoresce c Deflected by electric and magnetic fields d Have wavelengths shorter than ultraviolet rays 1992 1M

10 mL of gaseous hydrocarbon on combustion gives 20mL of CO and 30mL of H O g The hydrocarbon is 1 CH 2 CH 3 C H 4 C H

What weight in grams is represented by 1 5 moles of sulphur dioxide 1 60 g 3 96 g 2 74 g 4 91 g

20 Which of the following relates to photons both as wave motion and as a stream of particles 1992 1M a Interference c Diffraction b E mc d E hv

2 A solution which is 10 3 M each in Mn2 Fe Zn and Hg2 is treated with 10 16 M sulphide ion If Ksp of MnS FeS ZnS and HgS are 10 15 10 23 10 20 and 10 54 respectively which one will precipitate first 2003 1M a FeS on b MgS c HgS d ZnS

Which of the following lines correctly show the temperature dependence of equilibrium constant K for an exothermic reaction In KA 0 0 1 B and C A B C D L T K 2 C and D

2 The vapour pressure of pure liquid A is 0 80 atm When a non volatile B is added to A its vapour pressure drops to 0 60 atm The mole fraction of A in the solution is a 0 125 b 0 25 c 0 5 d 0 75

A sample of lithium was burnt in to give mixture of Li O and Li3N The ash was dissolved in 50 meq of HCI and resulting solution back titrated with NaOH 20 meg of NaOH were required to reach the end point An excess of NaOH was then added and solution distilled The ammonia released was then trapped in 10 meq of second acid solution required 6 meq of the base Calculate percentage Lithium burnt to the oxide

5 g of hydrogen reacts with 32 g of oxygen to form moles of water 1 1 3 3 2 2 4 4

Cisplatin an anticancer drug has the molecular formula Pt NH3 2Cl What is the mass in gram of one molecule Atomic weights Pt 195 H 1 0 N 14 Cl 35 5 a 4 98 x 10 21 b 4 98 x 10 22 c 6 55 x 10 21 d 3 85 x 10 22

liquid at room temperature leads to a 0 b At the room temperature the forces are 100 ling effects attraction between the particles of solid substances than those which exist in the gaseous state c The arrangement of particles is less ordered in the order in the state state However there is no

The density of vanadium is 5 96 g cm Convert the density to SI units of kg m

For the formation of 3 65 g of HCI gas what volume of hydrogen gas and chlorine gas are required at NTP conditions 1 1 L 1 L 3 3 651 1831 2 1 12 L 2 24 L 11211121 48

70 71 At any instant a rolling body may be considered to be in pure rotation about an axis through the point of contact This axis is translating forward with speed CBSE AIPMT 1989 a equal to centre of mass b zero c twice of centre of mass the above

21 What nature of electron is indicated by each of th following properties shown by electrons DAUG i Electron has mass 100x1 ii Electron possesses kinetic energy MOD iii Electrons can be polarised iv Electrons can be diffracted to ma

0 25 2 5 Calculate a molality b molarity and c mole fraction of KI if the density of 20 mass mass aqueous KI is 1 202 g mL

3 8 mol The number of mole of N atom in 18 066 x 1023 nitrogen atoms is 1 1 mol 2 2 mol 3 3 mol 4 4 mol

The osmotic pressure of 0 5 M aqueous solution of CH COOH having 2pH at temperature T is A 0 051 RT C 1 02 RT 0 51 RT D 0 102 RT

0 15 g of an organic compound gave 0 12 g of silver bromide by carius method Percentage of bromine in the compound is b d a 20 02 c 34 04 40 6 54 04

8 The number of aluminium ions present in 54 g of aluminium atomic weight 27 is a 2 c 11 x 10 24 2014 I b 18 d 1 2 x 10 24

C Compound X has significant amount of enol Y X racemises during enolisation X can be 1 2 shift CI 1 0 HC HC C CH O to CH3 CH C H 5 Due H CIO CH3 1 CH CN CN B Xoor D No change of CH C CH OCH bautomer No shift

Bleaching powder reacts with iodide ion according to the following unbalanced equation OCI I H 1 Cl H O A 0 6000 g sample of bleaching powder requires 35 24 mL of 0 1084 N Na S2O3 to titrate the liberated iodine The percentage of Cl in the sample is a 22 58 Cl c 11 29 Cl b 5 15 Cl d 45 16 Cl

Identify the spectral line having wavelength of 4 863 x 10 5cm in the emission spectra of hydrogen

If the density of methanol is 0 8 kgL what is the volume needed for making 2 5 L of its 0 4 M solution 1 0 4 L S 3 0 04 L 2 4 0 L D 4 40 L

Calculate molality of the solution obtained 2 0 3 m 3 0 2m Density of 2 03 M aqueous solution of acetic acid is 1 017 g mL molecular mass of acetic acid is 60 C the molality of solution 127 3 3 27 4 4 27

64 Among the following 1 Electron 2 Proton 3 a particle C ratio is minimum for 4 Neutron 65 Among the following which has maximum number of molecules 1 49 g of H PO4 3 28 g N 2 45 g of C6H12O6 4 36 g H O

4 04 A d 4 50 A 105 CsBr has bcc type structure with edge length 4 3 pm The shortest inter ionic distance between Cs and Br is a 3 72 pm b 1 86 pm c 7 44 pm d 4 3 pm

Which is the ion of V that has magnetic momen equal to 1 73 BM A V2 DV4 B V3 C V5

122 When dissolved in benzene two molecules of benzoic When Acid associate to form dimeric molecules If theoretical molar mass of benzoic acid is 122 g mole what will be its experimental value A 122 g mol B 61 g mol C x V T com D V constar 128 What is the v which contains

The average kinetic energy of one molecule of an ideal gas at 27 C and 1 atm pressure is 3 2 a 900 cal K mol b 6 21 x 10 21 JK 1 molecule 1 c 336 7 JK molecule 2 d 3741 3 JK mol

Q 3 Molar conductivity Am of aqueous solution of sodium stearate which behaves as a strong electrolyte is recorded at varying concentrations c of sodium stearate Which one of the following plots provides the correct representation of micelle formation in the solution critical micelle concentration CMC is marked with an arrow in the figures A Am O Am c CMC CMC Vc B Am D CMC c CMC c

26 Which of the following transition elements has maximum unpaired electrons A Cu B Fe C Cr D Mn

i Addition of heat at constant pressure When heat is added to a gas at constant pressure the added heat is used up in two ways One part of it expended for the external work done by the system and the other part of it goes to increase the internal energy of system As a result of increase in internal energy the temperature of the system also increases Suppose when 8q amount of heat is added to 1 mole of a gas at constant pressure the temperature of the gas is increased by dT So by definition Cpm ng D 2

Chelating ligands Bidentate or polydentate ligands which attach themselves with central metal ion in a way that they form a ring are known as chelating ligands No of rings denticity 1 5 or 6 membered rings are more stable e g i Pt trien SO denticity 4 chelating rings 3 ii Na Fe OH EDTA denticity of EDTA 5 chelating rings 4

13 A metal forms two oxides The higher oxide contains 80 metal 0 72 g of the lower oxide gave 0 8 g of higher oxide when oxidised Then the ratio of the weight of oxygen that combines with the fixed weight of the metal in the two oxides will be 1 2 3 2 1 2 4 3 2 3 4 5

7 5 g of metal oxide was reduced to 3 4 g of the metal If the gram atomic mass of the metal is 51 g mol then the formula of the metal oxide is 1 MO 3 M O 2 M O3 4 M O5

500 mL 4 Calculate the mass of urea NH CONH required in making 2 5 kg of 0 25 molal aqueous solution

5 4 3 2 20 Which atoms have undergone a change in the oxidation number in the reaction 2 KCIO3 2 KCl 302 a K and Cl b K and O c Cl and O d K Cl and O 21 The change in the oxidation number of

How many EDTA ethylenediaminetetraacetic acid molecules are required to make an octahedral complex with a Ca ion 1 One 2 Two 4 Three 3 Six

The wrong statement is 1 Halide ligands forms high spin complex 2 Strong ligands form low spin complex 3 FeF3 is inner orbital complex 4 NiCl 2 is outer orbital complex

0 The correct order regarding the electronegativity of hybrid orbitals of carbon is KOM 1 sp sp sp 3 sp sp sp 1 30 2 sp sp sp J 108M 4 sp sp sp

CuSO when reacts with KCN forms CuCN which 4 is insoluble in water It is soluble in excess of KCN due to formation of the following complex 1 K Cu CN 2 K Cu CN 3 CuCN 4 Cu KCu CN

rynil 1191 918 29lu For the toe system the value of magnetic moment is 2g miskona 1 2 83 B M 2 1 73 B M impound is not coloured TIZI T Cil DIS 3 3 87 B M 2sob gaite bis 4 4 9

Coordination compounds have great impo in biological systems In this contect which of the following statements is incorrect 1 Cyanocobalamin is vitamin B and contains 12 cobalt 2 Haemoglobin is the red pigment of blood and contains iron 3 Chlorophylls are green pigments in plants and contain calcium 4 Carboxypeptidase A is an enzyme and contains zinc

The elevation in boiling point of a solution of 13 44 g of CuCl2 in 1 kg of water using the following information will be Molecular weight of CuCl 134 4 and K 0 52 K molal 1 1 0 16 3 0 1 2 0 05 4 0 2

88 For a reaction 2A B product rate law is given as r K A B 2 What will be the order of reaction if A is taken in excess 1 1 3 3 2 1 1 2 4 Zero

What about degeneracy of 2p orbitals in a magnetic field 1 No degenerate orbital 2 Three degenerate orbital 3 Two degenerate orbital 4 Cannot be stated any thing about degenracy

Which of the following complex compounds does not exhibits geometrical isomerism 1 PtCl NH3 2 PdCl BrI 3 Pt NH py Cl Br 4 Pt NH Br