General Questions and Answers

In Sy reactions the correct order of reactivity for the following compounds CH Cl CH CH Cl CH3 CHCI and CH3 CC1 is 1 CH Cl CH3 CHCI CH3 CH CD CH3 3 CCI 2 CH3 Cl CH3 CH CH CH3 CHC CH3 CCI 3 CH3 CH Cl CH3 Cl CH CHCI CH3 3 CC1 4 CH3 2 CHCI CH CH CI CH CI CH3 CCI

1 In this following reaction N H NH3 a Find the mass of NH3 formed when 56 g of N2 reacts with 12 g of H b What do you think will be the amount in moles of N2 required to form 100 g of NH3

Which of the following is the correct order of decreasing acid strength more acidic less acidic a CH3COOH CICH COOH CL CHCOOH b CH COOH FCH COOH CH3CH OH OC FCH COOH CICH COOH BRCH COOH d CH CH OH FCH COOH CICH COOH

Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect The Bohr radius is represented by a A C The total energy of the electron is maximum when it is at a distance from the nucleus ao B the electron is maximum at the nucleus D The probability density of finding The electron can be found at a distance 2a from the nucleus The magnitude of the potential energy is double that of its kinetic energy on an average

A 2 5 L flask at 15 C contains a mixture of N2 He and Ne gases with the partial pressure of 0 32 atm for N2 0 15 atm for He and 0 42 atm for Ne a Calculate the total pressure of the mixture b Calculate the volume in liters at O C and 1 00 atm occupied by He and Ne if N2 is selectively removed

Problem 1 a When 4 2 g NaHCO3 is added to a solution of CH3COOH weighing 10 0 g it is observed that 2 2 g CO is released into atmosphere The residue is found to weigh 12 0 g Show that these observations are in agreement with the low of conservation of weigh b If 6 3 g of NaHCO3 are added to 15 0 g CH3COOH solution The residue is found to weigh 18 0 g What is the mass of CO released in this reaction

Structure of Atom Calculate the frequency and wavelength of photon with energy 3 98 2 12 1018 s 4 1 8 1014 1 6 x 1018 8 1 0 5 A 3 3 x 1015 s 1 0 8 A What is the work function wo of the 1 3 44 x 1018

Hydrogen peroxide solution 20mL reacts quantitatively with a solution of KMnO4 20mL acidified with dilute H SO4 The same volume of the KMnO4 solution is just decolourised by 10mL of MnSO4 in neutral medium simultaneously forming a dark brown precipitate of hydrated MnO2 The brown precipitate is dissolved in 10mL of 0 2M sodium oxalate under boiling condition in the presence of dilute H SO4 The strength of H O2 solution in mg per 100ml solution is A 340 B 680 C 120 D 100

An ideal solution has two components A and B If A is more volatile than B and also PPT then the correct relation bet mole fraction of A in liquid x and vapour Y phase is 1 2 3 XA YA XA YA XA YA Nothing can be said

Flask Long tube Beaker shown HCI gas Rubber bulb containing H O Blue litmus solution When rubber bulb of medicine dropper will be squeezed A the litmus solution in beaker will turn red with a slight increase in volume B the litmus solution in the beaker will turn red with slight decrease in volume C the litmus solution will rush up through the long tube to create a blue fountain in the 11

When Cl gas reacts with hot and concentrated sodium hydroxide solution the oxidation number of A chlorine changes from d 1 Zero to 1 and zero to 3 2 Zero to 1 and zero to 3 3 Zero to 1 and zero to 5 4 Zero to 1 and zero to 5

H Me CI OH H Me 1 OH OH Et Me 11 H Which of the following statements are correct A It is S 1 if I or II is formed N B It is S 1 if equimolar mixture of 1 and II is formed N N C It is S 2 if I or II is formed D It is S2 if II is formed

1 HCHO 2 CH COCH 3 CH COOH 4 CH OH 67 The wavelength of the radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1 would be Rydberg constant 1 097x107 m 3 9 1 10 nm 1 192 nm 2 4 6 nm 4 91 nm 68 The bond order in NO is 2 5 while that in NO is 3 Which of the following statements is true for these two species

Question 2 How many milliliters of 0 1 N dium hydroxide will be needed to neutralize a 00 mL solution that contains 6 45 g of oxalic id per liter MW oxalic acid 90 0349 sodium droxide 39

20 g of CH4 is burnt with 150 g of O2 producing 675 kJ of heat Assume that the amount of oxygen required is in accordance with the equation CH4 g 202 g CO g 2H O 1 After the reaction an excess of Cl2 is added to the reaction mixture and 77 g of CCl4 is obtained a The enthalpy of combustion of methane is 900 kJ mol 1 and the amount of O remaining unused is 16 g b The enthalpy of combustion of methane is 900 kJ mol 1 and the amount of O remaining unused is 48 g c The enthalpy of combustion of methane is 900 kJ mol 1 and amount of O remaining unused is 54 g d The enthalpy of combustion of methane is 920 kJ mol 1 and the amount of O remaining unused is 32 g

In a cell of a certain length and at a pressure of 100 mmHg gaseous acetone transmits 25 1 per cent of the incident radiation of wavelength 265 nm Assuming Beer s law to apply calculate the pressure at which 98 per cent of the incident radiation will be absorbed by acetone in the same cell at the same temperature

1 RCHO 2 RCOOH 7 Major products of the following reaction are CHO 1 CH OH and HCO H 3 HCHO 50 NOH GH 0 CH OH and COOH 2 HCOOH and 3 RCH NH CH OH CH OH and COOH 4 RCONH

5 151 The electronic configuration of a dipositive metal ion M is 2 8 14 and its ionic weight is 58 a m u The number of neutrons in its nucleus would be 1 30 2 32 3 34 4 42

10 When 2 46 g of hydrated salt MSO4 xH O is completely dehydrated 1 20g of anhydrous salt is obtained If the molecular weight of anhydrous salt is 120 g mol what is the value of x a 2 b 4 c 6 921

The atomic spectrum of Li ion arises due to the transition of an electron from n2 to n If n n 6 and n n 2 find the wavelength of 4th line of this series in Li ion 2 A 4456 nm B C 45 56 nm 455 6 nm

3 A cup of tea placed in the room eventually acquires room temperature by losing heat The process may be considered close to a Cyclic process b Reversible process c Isothermal process d None of these

When 1 491 grams of sucrose Mola mass 342 3 g mol is burned in a bomb calorimeter the temperature of the calorimeter increases from 22 41 C to 26 63 C If the heat capacity of the calorimeter is 4 900 kJ C what is the heat of combustion of sucrose in kJ mol

Which of the following statements are correct 1 The ve value of AH for the dissolution of ionic compounds is enough to predict the compound solubility in water at any temperature II For the alkali metals carbonate solubility order increases down the group III For the alkali metals ozonide the thermal stability order decreases down the group IV For the alkaline earth metals nitride the thermal stability order decreases down the group A B C I III I II III I and IV

The following concentration were obtained for the formation of NH3 from N and H at equ for the reaction N g 3H g 2NH3 g N 1 5 x 10 2 M H 3 0 x 10 2 M NH 1 2 10 2 M Calculate equilibrium constant 044

212 3 6 147 What is the electronic configuration of an element in its first excited state which is isoelectronic with O 1 Ne 3s 3p 3d 3 Ne 3s 3p 3d 148 The Ilian are 4 15 2 Ne 3s 3p4 4 Ne 3s 3p5

Problem 11 A 12 pole 3 phase alternator driven at a speed of 500 rpm supplies power to an 8 pole 3 phase induction motor If the slip of the motor at full load is 3 calculate the full load speed of the motor

Which of the following OPTIONS are CORRECT 3 Points Multiple Answer question The chemical potential of the ith gas in a mixture of gases is T RT Inp RT Inm OT av s OP AS v JA V P Free energy is an extensive property but chemical potential is an intensive property dG SdT VdP E OG ani sv nj dn

gx 5227 2 J 2 5227 2 J 3 2257 J 4 2257 J When 229 J of energy is supplied as heat at constant pressure to 3 mol Ar g the temperature of the sample is increased by 2 55K Calculate the molar heat capacity at constant volume 1 30 kJ K mol 2 30 J K mol 3 21 7 J K mol 4 21 7 kJ K mol 2 21407 804 E

6 023 x 1020 molecules of urea are present in 100mL of its solution The concentration of solution is 100 mL602310204fed A 0 01 M B 0 001 M C 0 1 M

Solution A contains 0 280 mol of propionic acid Ka 7 50 10 6 Solution B contains 0 215 mol of sodium hydroxide Calculate the pH of a solution formed by mixing Solution A and Solution B together Present your numerical answer to 2 decimal places

40 180 0 2 g ml A cylinder contains SO gas at a pressure of 4 1 atmosphere and at 47 C temperature The density of the gas in the cylinder is 0 4 g ml 0 01 g ml Mark for Review 10 g ml 02 58 hr min

2 eV in second orbit of le of total energy in first atom 46 47 Which of the following electron transition will require the largest amount of energy in a hydrogen atom From n 1 to n 2 2 From n 2 to n 3 3 From n o to n 1 4 From n 3 to n 5 If the potenti

15 80 Identify each of the following as a fatty acid soap triacylglycerol wax glycerophospholipid sphingolipid or steroid 15 1 15 2 15 3 15 5 15 6 sphingomyelin b whale blubber a C adipose tissue d progesterone cortisone e

The table shows the nature of the reactants and products formed in a certain type of chemical reaction Nature of Reactants and Products Reactants Products lonic compound lonic compound lonic compound lonic compound Which of the following is true about this type of chemical reaction It is a single replacement reaction and all four compounds are different O It is a double replacement reaction and all four compounds are different O It is a single replacement reaction and each compound has the same set of ions O It is a double replacement reaction and each compound has the same set of ions

Calculate the volume of dry CO gas produced at 37 C and 1 00 atm when 36 0 g of glucose 180 2 g mol is consumed in the following reaction R 0 082 atm L mol K C H O s 60 g 6CO g 6H O 1 A 6 35 L B 9 56 L C 23 8 L D 26 1 L E 30 5 L

14 7 254 Full Alternative 14 76 Toradol is used in dentistry to relieve pain Identify the functional groups in Toradol 14 1 14 3 14 5 14 6 0 N OH Toradol

A robot spacecraft returned samples from the planetesimal 98765 ALEKS located in the outer Solar System Mass spectroscopic analysis produced the following data on the isotopes of tin in these samples mass isotope relative amu abundance 119 Sn 118 90 91 7 114 Sn 113 90 8 3 Use these measurements to complete the entry for tin in the Periodic Table that would be used on 98765 ALEKS Round your entry for the atomic mass to 3 significant digits Caution your correct answer will have the same format but not necessarily the same numbers as the entry for tin in the Periodic Table we use here on Earth

21 Type your answer 5 points Calculate the H3O ion concentration in an aqueous solution with a pH of 2 39 at 25 C Report your answer in scientific notation with 2 places past the decimal point Write scientific notation in this format 1 23 10 1 Do not include a unit in your answer

Use the properties of logarithms to expand log xy Each logarithm in your answer should involve only one variable Assume that all variables are positive log xy log

Classify these substances More than one answer may apply in each case N compound solution element pure substance homogeneous mixture heterogeneous mixture N 0 homogeneous mixture compound heterogeneous mixture solution pure substance element 0 homogeneous mixture pure substance heterogeneous mixture element solution compound Air mostly N and 0 pure substance homogeneous mixture heterogeneous mixture element solution compound

A 76 00 pound flask of mercury costs 154 50 The density of mercury is 13 534 g cm Find the price of one cubic inch of mercury by calculating intermediate values What is the price of one pound of mercury What is the price of 1 g of mercury What is the price of 1 cm of mercury S What is the price of 1 in of mercury It takes 3 600 in of mercury to make one manometer Find the price of the mercury used to make 21 manometers by fir calculating the cost of mercury for one manometer What is the price of mercury used to make one manometer

Be 28 Express your answer as an integer

19 5 points Which of the following are conjugate acid base pairs Select all that apply Incorrect responses are penalized H SO3 and HSO H SO4 and H SO3 H3PO4 and HPO4 HCIO2 and CIO H3O and OH H SO3 and SO3 H CO3 and HCN 00 H3O and H O HC H302 and C H302 points FLIC12

A computer monitor has a width of 15 61 inches and a height of 11 71 inches What is the area of the monitor display in square meters area OC How many significant figures should there be in the answer 3 4 182 5 Incorrect m

Une component of a metal sculpture consists of a solid cube with an edge of length 0 331 m The alloy used to make the cube has a density of 6470 kg m Find the cube s mass m m I Enter numeric value kg

Convert 1 89 m to inches 1 90 m 7139

3 Two special steps in the Experimental Procedure are incorporated to reduce the loss of the calcium oxalate precipitate Identify the steps in the procedure and the reason for each step

If the caffeine concentration in a particular brand of soda is 3 97 mg oz drinking how many cans of soda would be lethal Assume that 10 0 g of caffeine is a lethal dose and there are 12 oz in a can cans of soda

While driving your rental car on your vacation in Europe you find that you are getting 12 4 km L of gasoline What does this value correspond to in miles per gallon 12 4 km L mi gal

Which reaction below represents the first ionization of O O g e 02 g O g e O g Oo g O g e O g O g e Oo g e O g