General Questions and Answers

Calculate the volume in mL of 25 1 g of a substance with a density of 4 63 g mL enter with correct sig figs I will grade it after the due date as always Your Answer

Medical Chemistry of the following transition neither shows absorption nor emission of energy in case of hydrogen atom 1 3px 3s 3 3s 3dv xy In ground stat 2 3dy 3d z 4 All the abou

Same quantity of current is passed through molten NaCl and molten Al O If 4 6 g of Na was deposited in one cell the mass of Al deposited in other cell is 1 0 9 g 2 1 8 g 3 2 7 g 4 3 6 g

Which of the following features is incorrect for phylloclade It shows unlimited growth L Green in colour and photosynthetic in nature Modified fleshy cylindrical structure Has large number of stem thorns

Given EA 0 80 V EMM 2 37 V E 0 34 V Egg 0 79 V Which of the following statement is correct 1 AgNO can be stored in copper vessel 2 Mg NO can not be stored in copper vessel 3 CuCl can be stored in silver vessel 4 HgCl can be stored in copper vessel

Match the transformations Column I in column I with appropriate options in column II Column II A CO s CO g Pris p phase transition B CaCO s CaO s CO g a allotropic change X AH is positive C 2H H g D P Prie red solid s t AS is positive AS is negative 201

148 For a first order reaction the plot of log C against t logC vs t gives a straight line with slope equal to A k 2 303 C In k 2 303 B k 2 303 R 15

2 18 A simple harmonic motion having an amplitude A and time period T is represented by the equation y 5 sin 2n t 4x m Then the values of A in m and T in sec are a A 5 T 2 b A 10 T 1 c A 5 T 1

Zero Marks Negative Marks 1 If wrong option is selected If a solution of stearic acid C18H3602 M 284 in benzene contains 1 42 gm acid per L When this solution 100 L is dropped on surface C6H6 gets evaporated and acid forms a unimolecular layer on the surface If it covers an area 6020 cm with unimolecular film Find the area covered by one molecule of acid NA 6 02 x 10 3 O 2x 10 20 cm 4 x 10 20 cm O 2 1020 cm 0 If none of the option is selected O 4 1020 cm

Reaction AB carried out inside a container Concentration varies as Ct a bt Rate of reaction can be expressed in term of pressure at temperature T 300 K 1 Take b 4 R atm mol k 12 Give your Answer divide by 10

No of mole of KMnO4 needed to react with 1 mole of SO ion in acidic medium is 2 5 NO NH The equivalent mass of NO ion is 7 75 g eq 2N H O solution is same as that of 1M H O2 solution in its reactions with KMnO4 Amount of NaOH required to neutralize completely 100mL of 0 15N N O5 is 0 6g

A non volatile solute A dissolved in water undergoes partial association as per the following reaction nA A If van t Hoff factor is found to be 0 75 select the correct option s for n and degree of polymerisation a n 2a n 2 1 2 n 2a n 3d 3

gas according to the following equation C8H18 1 2O2 g 8 CO g 9 H O g AH 5074 1 kJ Part A Review Constants What mass of octane in g is required to produce 5250 kJ of heat Express your answer to three significant figures

3 mole of an ideal gas is expanded irreversibly and isothermally at 27 C unit its volume is doubled and 3 5 kJ heat is absorbed form surrounding AStotal system surrounding is 1 20 3 J K 3 40 6 J K 2 20 3 J K 4 40 6 J K

From the following the number of atoms is greater in A 4 g hydrogen C 48 g magnesium One mole of CO2 contains A 6 02 1023 atoms of C B 71 g chlorine D 127 g iodine B 6 02 1023 atoms of O

When 1 4 gm of CaO is added to 98 6 ml of water at 25 C in a calorimeter the temperature of water rises to 30 C Assuming that specific heat of solution is 4 2 J gm C Calorimeter absorbs a negligible amount of heat Calculate AH for the reaction CaO H O 1 Ca OH aq

A student was carrying out the following chemical reaction in Lab 2A 3B6C balanced reaction He used 30 mole of A and 30 mole of B and at the end of reaction he found 40 moles of C were forme Identify the correct statement s A Total mass before and after the reaction will remain same B B is limiting reagent C yield is 60 D At 50 vield 30 moles of C will be formed

2 Cu 3 Mn 4 Fe 11 of The number of geometrical isomers CrCl en NH3 where en ethylenediamine is 1 2 2 3 3 4 4 1 12 The total number of geometrical isomers possible for an octahedral complex of the type MA2 B C is M transition metal A B and C are monodentate ligands 1 3 2 4 3 5 4 6 13 The hybridised state of Cu in Cu NH3 4 1 is 1 sp 2 sp 3 sp 4 dsp 14 EAN of Fe in K3 Fe CN 6 is 1 34 2 35 3 36 4 37 15 2 d 3 d 4 d Fill OMR Sheet If above link doesn t work please go to test link fr where you got the pdf and fill OMR from there

A certain metal P has FCC structure with unit cell length 3 16 A the size of largest atom that can be accommodated into the interstices metal without changing the position of metal atoms is O 0 53A O 0 88A O 0 149A None of the above

E Ecl cr 1 36V E Cr Cr E Cr 0 Cr 1 33V E 0 74V MnO4 Mn b DA to suferit 1 51V 31 sonth Among the following the strongest reducing agent is 1 Cr 3 Cr 2 Mn 4 CI JEE Main 2

na ing The density of KCI is 1 9893 g cm and the length of a side unit cell is 6 29082 A as determined by X rays diffraction The value of Avogadro s number calculated from these data is 1 6 017 x 1023 2 6 023 x 1023 3 6 03 x 1023 19

At t C temperature the observed vapour density of A is 17 5 for the gaseous reaction 2A B 2C If molecular weight of A is 48 then the percentage dissociation of A will be 1 70 27 2 74 28 N

8 Select correct statement 1 Geometrical isomers of complexes may differ in dipole moment and visible UV spectra 2 Complexes of the type Ma b can also have facial fac and meridional mer isomer 3 No optical isomer exists for the complex trans Co en CL 4 All are correct

The atom represents 1 It is an atom of fluorine II The atomic number of fluorine is 9 III The nucleus of fluorine has 9 protons IV There are 9 electrons revolving around the nucleus of fluorine 6 719

DOMY 3 A second reaction mixture was made up in the following way 10 mL of 3 0M acetone 10 mL of 0 0030M 1 5 0 mL of 1 5M HCI 25 mL H O a Calculate the molarities of acetone H ion and I in the reaction mixture

Consider the salt NH4F in which the weak acid HF and the weak base NH4OH have different strengths 1 8 x 10 5 In such solutions since H OH the pH of such i e Ka of acid 7 2 x 10 4 and Kb solutions less than 7 acidic Case 3 If Ka Kb pH 7 Consider the salt NH4CN in which the weak acid HCN and the weak base NH4OH have differen strengths i e Ka of acid 4 0 x 10 10 and Kb 1 8 x 10 5 In such solutions since H OH hence t pH of such solutions more than 7 basic

33 Which one of these graphs for an ideal gas the arrow indication is incorrectly marked decreasing Press a c 0 P 0 decreasing Volume Temp in K Increasing Temp 2009 2 noolled ST101 b 273 d P 1 V 1 C decreasing Press

Experiment P you titrated a weak acid with a strong base When 1 336 g of an unknown acid HA was dissolved in 100 0 mL of water and titrated with 0 492 M NaOH the value of pH was 2 70 after 0 00 mL of NaOH were added and was 70 pka after 13 29 mL were added The molar mass of the acid HA is in g mol 204 106

5 A solution with osmotic pressure r is separated from another solution of osmotic pressure by SPM solvent flows from T then 1 1 1 3 Solutions are isotonic 2 4 Solutions are ideal

Which of the following pairs of physical quantities does not have same dimensional formula 1 Work and torque 2 Angular momentum and Planck s constant 4 Impulse and linear momentum 3 Tension and surface tension If the ratio of intensities maximum and minimum in Young s double slit experiment is 9 1 the ratio of amplitude of the coherent sources is 1 9 1 2 3 1 3 2 1 4 1 1 The angle of incidence at which reflected light is totally polarized for reflection from air to glas

M molecular weight of NH OH Number of moles of CaO required to remove hardness from 1000 litre water having 324 ppm of calcium bicarbonate and 74 5 ppm of potassium chloride is 1 8 2 4 3 3 4 2 om on acidified Kl solution The strength of H O solution 2

Which of the following is correct A Mole fraction of I mole fraction of II 1 If only two components are present Mole fraction of I Mole of I B Mole fraction of II Mole of II If only two components are present C Mole fraction of solute Moles of solute Moles of solute Moles of solvent D All of the above

A binary liquid solution is prepared by mixing n heptane and ethanol Which one of the following statements is correct regarding the behaviour of the solution Option A The solution formed is an ideal solution B The solution is non ideal showing possible deviation from Raoult s law C The solution is non ideal showing negative deviation from Raoult s law Rate this quest

Two litre solution of a buffer mixture containing 1 0 M NaH PO and 1 0 M Na HPO4 is placed in two compartments one litre in each of an electrolytic cell The platinum electrodes are inserted in each compartment and 1 25 A current is passed for 965 min Assuming electrolysis of only water at each compartment what will be pH in each compartment after passage of above charge pK for H PO4 2 15 log 7 0 85 a Anode 3 00 Anode 1 30 b Cathode 3 00 d Cathode 1 30

8 The reaction of H3N3B Cl3 A with LiBH in tetrahydrofuran gives inorganic benzene B Further the reaction of A with C leads to H3N3B3 Me 3 Compounds B and C respectively are 1 Borazine and Me Br 3 Diborane and MeMgBr 2 Boron nitride and MeBr 4 Borazine and MeMgBr

How many statements are is belongs to gemma cup a Unicellular structure b Green in colour c Multicellular bud d Participate in sexual reproduction Question Type Single Correct Type 1 2 21

with a magnetic field The population difference in a typical magnetic field of several Tesla at room temperature is on the order of Select Nuclear magnetic resonance is a spectroscopic techni Select t parts per thousand parts per million parts per trillion parts per billion population um and the lower the Select 1 lifference in a t temperature is and the low the s OK to 0 3 K th ence will be on the order of

When the pure solvent diffuses out of the solution through the semi permeable membrane then the process is called A Osmosis B 00 C Reverse osmosis Sorption Dialysis

130 A compound A when reacted with PCI and then with ammonia gave B B when treated with bromine and caustic potash produced C C on treatement with NaNO and HCl at 0 C and then boiling produced orthocresol Compound A is o toluic acid o chlorotoluene 3 0 bromotoluene 4 m toluic acid 1 2

What formulas do I use for this problem and what do the formulas mean and how to solve this problem step by step I am confused In the laboratory 31 0 g of ice at 0 degrees celsius is placed into an 85 0 g copper calorimeter cup that contains 155 g of water at an initial temperature of 23 0 degrees celsius After the ice melts the final temperature of the water is found to be 6 25 degrees celsius From this laboratory data find the heat of fusion of water and the percentage error between the standard value and this experimental value

The compounds commonly known as amino acids are actually a aminocarboxylic acids What carbonyl compound should be used to synthesize the amino acid shown here Hint think reductive amination and keep same formal charge Part A CH3CH NH

48 Equal volumes of three acid solutions of pH 3 4 and 5 are mixed in a vessel What will be the H ion concentration in the mixture b 1 11 x 10 M d 3 7 x 10 M a 3 7 x 10 M c 1 11 x 104 M 2008

The number of sodium atoms in 2 moles of sodium ferrocyanide Na Fe CN is 1 12 x 23 2 26 x 1023 3 34 x 1023 4 48 x 1023 The total number of g molecules of SO Cl in 13 5 g of sulphuryl chloride is

Formation of a solution from two components can be considered as i Pure solvent separated solvent molecules AH ii Pure solute separated solute molecules AH iii Interaction between separated solvent and separated solute molecules in the solution AH3 Solution so formed will be ideal if 1 AHsolution AH AH AH3 2 AH solution AH AH AH3 3 AHsolution AH AH AH3 4 AHsolution AH3 AH AH

Arrange the following ions in increasing order of their ionic radii Ce La Pm3 and Yb 1 Ce Yb Pm La 2 Yb3 Pm Ce La 3 Yb Pm Lat Ce 3 4 Pm La Cet Yb Which factor affects the velocity constant k of a reaction 1 Change in the concentration of the reactant

A mixture of N and Ar gases in a cylinder contains 7 g of N and 8 g of Ar If the total pressure of the mixture of the gases in the cylinder is 27 bar the partial pressure of N is Use atomic masses in g mol N 14 Ar 40 a 9 bar b 12 bar c 15 bar d 18 bar NEET 2020

Given the following information for an ideal gas Isothermal reversible expansion P V T A T T B R P C V Which of the following is incorrect D Adiabatic reversible expansion T T Adiabatic irreversible expansion P V T P V T P2 V T

When a strong base was added to the solution of an unknown salt a gas with a characteristic smell was released that turned blue the red litmus paper and after that adding Silver Nitrate a white ppt was obtained then the formula of the salt should be

Write the reaction responsible for the solution being basic Do not include spectator ions If you chose multiple solutions in part 1 then write the reaction for the most basic solution X F H O He aq HF OH

8 1 1 2 3 In the following reaction The structure of the major product X is 1 3 O N Cone HNO Conc H SO O N 3 0 5 2 X 4 2 NO NO