General Questions and Answers

The velocity of the electron in the first Bohr orbit in H atom is 2 2 x 108 cm sec The velocity of the lone electron in the third Bohr orbit of Li is atomic number 3 a 19 8 x 108 cm sec b 6 6 108 cm sec c 4 4 108 cm sec 108

On addition of NaOH to CH COOH solution 60 of the acid is neutralised If pK of CH COOH is 4 7 then the pH of the resulting solution is 1 More than 4 7 but less than 5 0 2 Less than 4 7 but more than 4 0 3 More than 5 0 1 Romains unchanged

5 The mass of electron moving with velocity of light is a 2me c Infinite b 3me d Zero

4 What volume of hydrogen gas at 273K and 1 atm pressure will be consumed in obtaining 21 6g of elemental boron at mass 10 8 from the reduction of boron trichloride with hydrogen AIEEE 2003 a 44 8 L c 89 6 L b 22 4 L d 67 2 L

57 between their molecular masses The drain cleaner Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen What volume of dihydrogen at 20 C and one bar will be released when 0 15g of aluminum reacts What 11 pressure

5 0 M HNUS How many grams of Cl is produced from 15 8 g of KMnO and 50 mL of 10 M HCl according to the reaction 2KMnO 16HCI 2KCI 2MnCl 8H 0 5CL

Mole fraction of nitrogen in air is 1 0 14 2 0 28 3 0 5 4 0 78

3 Two elements A at wt 75 and B at wt 16 combine to yield a compound The by weight of A in the compound was found to be 75 08 The formula of the compound is a A B b A B3 d AB2 c AB

20 For the reaction 2NO2 g 2NO g O g 1 8x10 6 at 185 C The value of Kat 185 C for the reaction Kc NO g 0 8 a 0 9 106 0 105 103 NO g is b 1 95 10 3 d 7 5 10

In A g 3A g reaction the initial concentra tion of A is a mol L If x is degree of dissocia tion of A The total number of moles at equilib rium will be a a 1 x 342 1 a ax 2 X Fot

Chinook Loo Mistral 2 3 4 Puna 5 Set 3 2 3 Pampero Column I Fohn Simoon Yoma Norwester 4 5 Loo Set 4 Column 1 1 Cirrus Cloud 2 Cumulus Stratus 4 Nimbus a b c d e f e f a b a b Japan c Europe d Arabian desert New Zealand Easterlies 1 Column II From the Alps to the Mediterranean sea Andes region d Rocky mountains in the USA South America Plains of northern India Westerlies Column II Causes sunstroke to people Column II Rain bearing Vertical clouds At lower level At higher level At middle level

Two liquids A B form an ideal solution What is the vapour pressure of solution containing 2 moles of A and 3 moles of B at 300 K Given At 300 K Vapour pr of pure liquid A P 100 torr Vapour pr of pure liquid torr B Pg 300 1 200 torr 3 180 torr 2 140 torr 4 None of these

27 van der Waal s constant a has the dimensions o 1 Mol L 1 2 Atm L2 mol 2 3 Litre mol 1 4 Atm L mol 2

Classify the following into solid liquid and gas Coal kerosene wood oxygen sugar blood water vapour milk wax

Cu aq 4NH3 aq Cu NH3 41 aq Overall instability constant for Cu NH3 41 ion shall be 1 2 1 1013 2 7 1013 3 4 7 x 10 14 4 3 10 16

Calculate the mass of a photon of sodium light having 5894 and velocity 3x108 ms h 6 6x10 34kg m s 1 wavelength

What value of 3 0 M HNO3 can react completely with 15 0g brass 90 Cu and 10 Zn according to equations Cu 4H aq 2NO3 aq 2NO2 g Cu 2H O 4Zn 10H aq NO3 aq NH 4Zn2 3H O Also report what volume of NO gas at 25 C and 1 0 atm will be produced

28 How many gram of CaCO3 be decomposed to produce 20 litre of CO at 750 torr and 27 C

Which of the following ionisation energy order is NOT correct 2 A Cu Cu 2 LOBT Mn 2 Mn C N N D All of the above W 3

The density of 1 M solution of NaCl is 1 0585 g mL The molality of the solution is A 1 0585 B 1 00 C 0 10 D 0 0585 What is the concentration of HCl in the final solution when 65 mL of a 12 M HCl solution is diluted water to a total volume of 0 15 L

How many moles of FeCl3 can be prepared by the reaction of 10g of KMnO4 10 07 mole of FeCl and 500 mL of 3M HCI following the reaction

115 How many milli litre of 0 5 M H SO4 are needed to dissolve 0 5 g of copper II carbonate a 8 10 mL b 16 20 mL c 4 05 mL d 12 05 mLO0

106 07 In Davisson Germer experiment the correct relation between angle of diffraction and glancing angle is Do 90 2 0 90 2 The minimum wavelength in Lyman series is 2 3 0 0 2 4 0 0

6 One molecule of haemoglobin will combine with four O molecules If 1 0g of haemoglobin combines with 1 53 mL of oxygen at body temperature 37 C and a pressure of 743 torr what is the molar mass of haemoglobin

The figure shows two paths for the change of state of a gas from A to B The ratio of molar heat capacities in path 1 and path 2 is A 1 0 1 B 1 D Data insufficient

1 For which of the following electrolytes the graph of Am against gives a negative slope Sodium acetate BY Acetic acid C Ammonium hydroxide D Water dm dm Ac mbc Y Vec C

Hybridisation and magnetic moment of Cu Cu NH are 1 dsp 0 BM 3 sp 0 M 2 dsp 3 BM 4 sp 3 BM

The number of litres of air required to burn litres of C H is approximately 1 40 2 60 3 80 4 100

25 71 g of chlorine combines with a metal giving 111 g of its chloride The chloride is isomorphous with MgCl2 6H O The atomic mass of the metal is a 20 e 40 b 30 d 69

Volume of 2M HCl required to neutralise the solution containing 1 mole of NH4Cl and 1 mole of NaOH is a 1 litre b 2 litre c 3 litre d 1 2 litre

156 Not considering the electron spin the degeneracy of second excited state of H atom is 9 while the degeneracy of the first excited state of H is a 1 b 2 c 3 d 4

How much amount of CuSO4 5H O required fo liberation of 2 54 g I when titrated with KI 2 4 99 gm 2 1 2 5 gm 3 2 4 gm 4 1 2 om to give

5 Dichromate ion in acid solution oxidizes stannous ion as 3Sn 14H Cr 0 3Sn 4 2Cr 7H C a If SnCl is the source of Sn2 how many g o SnCl would be contained in 2 litre of 0 1 M solution b If K Cr O7 is the source of Cr 07 what is the normality of solution containing 4 9g K Cr 0 in 0 1 litre of solution FITT 1005

2 A gas can be liquefied most suitably at a T T and P P c T T and P P b T T and P Pc d T T and P Pe

7 The reaction of white phosphorus with aqueous NaOH gives phosphine along with another phosphorus containing compound The reaction type the oxidation states of phosphorus in phosphine and the other products are respectively a redox reaction 3 and 5 b redox reaction 3 and 5 c disproportionation reaction 3 and 1 d disproportionation reaction 3 and 3

57 Amount of oxygen in 32 2g of Na2SO4 10H O is a 20 8 g c 2 24 g b 26 71 g d 2 08 g

of another Pressure of 1 g of an ideal gas A at 27 C is found to be 2 bar When 2 ideal gas B is introduced in the same flask at same temperature the pressure becomes 3 bar Find a relationship between their molecular masses

15 The normal boiling point of a liquid X is 400 K Which of the following statement is true about the process X 1 X g a at 400 K and 1 atm pressure AG 0 b at 400 K and 2 atm pressure AG ve c at 400 K and 0 1 atm pressure AG ve d at 410 K and 1 atm pressure AG ve

The isotopic abundance of C 12 and C 14 is 98 and 2 respectively What would be the number of atoms of C 14 isotope in 12 g carbon sample 1 1 2 x 10 2 3 5 88 x 1023 2 3 01 x 1023 4 6 02 x 1023

5 If for some reason the parietal cells of the gut epithelium become partially non functional what is likely to happen a The pancreatic enzymes and specially the trypsin and lipase will not work efficiently b The pH of stomach will fall abruptly c Steapsin will be more effective d Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones

respectively 4 The pressure in bulb dropped from 2000 to 1500 mm of Hg in 47 minute when the contained O leaked through a small hole The bulb was then completely evacuated A mixture of O and another gas of mol wt 79 in the molar ratio 1 1 at a total pressure of 4000 mm of Hg was introduced Find the mole ratio of two gases remaining in the bulb after a period of 74 minute

20 The equilibrium constants for the reaction A 2 A at 500 K and 700 K are 1 10 0 and 1 x 10 5 The given reaction is CBSE AIPMT 1996 ron a exothermic c endothermic If is the b slow d fast fraction of HI dissociated

17 K of a CaSO4 5H O is 9 x 106 Find the volume sp of CaSO for 1gm Mw 136 4 1 2 45 litre 3 4 52 litre 2 5 1 litre 4 3 2 litre

An experiment requires minimum activi produced at the rate of 346 B particles per minut The half life period of 22 Mo which is a B emitter 66 6 hr Find the minimum amount of M required to carry out the experiment in 6 909 hr

Mole fraction of ethanol in ethanol water mixture is 0 25 Hence percentage concentration of ethanol by weight of mixture is 1 25 2 75 3 46 4 54

2 200 mL of a solution of mixture of NaOH and Na2CO3 was first titrated with phenolphthalein and N 10 HCl 17 5 mL of HCl was required for the end point After this methyl orange was added and 2 5 mL of same HCI was again required for next end point Find out amounts of NaOH and Na CO3 in mixture

59 A manometer is connected to a gas containing bulb The open arm reads 43 7 cm where as the arm connected to the bulb reads 15 6 cm If the barometric pressure is 743 mm mercury What is the pressure of gas in bar

d Mole fraction In a compound C H N atoms are present in 9 1 3 5 by weight Molecular weight of compound is 108 Its molecular formula is AIEEE 2002 a C H6N2 c C6H8N2 b C3H4N d C H12N 3

39 When 1 g of anhydrous oxalic acid is burnt at 25 C the amount of heat liberated is 2 835 kJ AH combustion is oxalic acid C H O 2 445 65 kJ 4 155 16 kJ 1 255 15 kJ 3 295 24 kJ

Crude calcium carbide is made in an electric furnace by the following reaction CaO 3C CaC CO The product contains 85 of CaC and 15 of unreacted CaO a How much CaO is to be added to the furnace charge for each 1000 kg of CaC