General Questions and Answers

The sum of number of a bonds and bonds present in P4010 is Answer 20 20 01 01 2 04 04 05 05 06 06 07 07 08 08 6 9 21 26 31 36 22 27 32 37

4 K changes significantly with pressure 9 At 400 K K 6 for the reaction 1 2N g 3 2H 9 NH g What is K for the reaction 2NH g N g 3H g 1 0 028 2 6 3 0 036 4 0 17 C 9 Chemical Equilibrium y frutan int 19 400 K afferen 1 2N g 3 2H g NH g fuff 2NH g N g 3H g 1 0 028 2 6 3 0 036 4 0 17

Question No 28 Consider the process of zone refining Top side Metal rod Heater Bottom side Heater is sliding from top side to bottom side Identify the incorrect statement O The bottom side of the metal rod is rich in impurities O Metals like Si Ge and Ga of low purity are purified by this method This process is based upon fractional crystallization as the impurity prefers to stay in the melt O This method is based on the principle that the impurities are more soluble in the melt than in solid state of the metal

Which of the following is are correct A B C D At 75 C ionic product of water is more than 1 0 10 M At 25 C degree of dissociation of water is 1 8 10 7 At 75 C water is acidic p p 14 at all temperature

25 Find the amount of alum KAI SO4 2 12H O separated out from 320 g KAI SO solution saturated at 20 C If 160 g of water is evaporated from the solution at 20 C Given that the solution saturated at 20 C contains 5 5 of KAl SO4 2 by mass Use molar mass K 39 Al 27 S 32 roli diand with Idn wnia tal if

Chern Section A This section contains 35 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 3 and 4 out Select the correct statement among the following KCI forms KCI 6 H O hydrate O Sr has higher hydration enthalpy than Mg O Sodium is the most abundant cations present within cell fluids O Beryllium does not impart any colour to the flame

30 90 Br AgCl Ag can be most easily coagulated by least concentration of O co O PO Mark for Review O Fe CN 6 4 01 2 hr m

0 The correct structure of tribromooctaoxide is O O O O O O 11 O 4 11 11 1 O Br Br Br 0 2 O Br Br Br O 3 O Br Br Br O 4 O Br Br Br O TO O FO O 0 0 0 O 0 O O o 0

1 Which of the following primary and secondary valencies are not correctly marked against the compound a Cr NH3 6 Cl3 p 3 s 6 b K PtCl4 p 2 s 4 c Pt NH3 Cl p 2 s 4 d Cu NH3 4 SO4 p 4 s 4

10 ml of a sample of H O2 solution liberates 112 ml of O2 gas at STP upon decomposition Identify the correct statement s A Normality of the above sample of H2O2 is 0 5 N Molarity of the above sample of H O2 is 1 M Milliequivalents of hypo required for the titration of liberated I when 10 ml of the same sample of H O2 solution is treated with excess of acidified solution of KI are 20 w v of given sample of H O2 is 3 4

The mass of potassium dichromate crystals required to oxidise 750 cm of 0 6 M Mohr s salt solution is Given molar mass potassium dichromate 294 Mohr s salt 392 AIEEE 2011 1 2 2 g 3 0 45 g 2 0 49 g 4 22 05 g

A 20 0 mL solution containing 0 2 g impure H O reacts completely with 0 316 g of KMnO4 in acid solution The purity of H O in is mol wt of H O 34 mol wt of KMnO4 158 JEE Main 20201

What is the value of carbonate hardness of water sample if 100 mL of it took 5 mL of 0 09 N HCI solution Molecular weight of Na2CO3 106 Answer Rate this questio

Sir please solve According to the line of NCERT Q 80 CST 22 First Order Reaction 1 Which of the following reactions occur through first order kinetics 1 2NH3 g Pt N g 3H g A 2 H O2 3 CH3CHO H O 12 02 CH4 CO hy QUIOL 7 2

Cholesterol C27H460 is a waxy substance that acts to maintain membrane fluidity within the cells of your body by preventing fatty acids from crystallizing a What is the molar mass of cholesterol 3 pts b What is the percent by mass of carbon in cholesterol 3 pts c How many moles are present in 212 6 g of cholesterol 3 pts d How many moles of hydrogen atoms are present in 212 6 g of cholesterol 3 pts d A normal blood level of cholesterol for a healthy adult is 180 mg dL where 1 dL 10 L An average adult has 5 2 L of blood in their body How many molecules of cholesterol would be found in an adult with high cholesterol of 220 mg dL in their blood 5 pts

I have a ques when we talk about H2O it decomposes in to H ion and OH ion Why does 1 H loses it s 1 e and be comes ve while the other one still remains attached to O and acquires Ve charge What factors will determine it Please explain in simple language

View In English In an organic compound hydrogen is 2 9 times of C present and oxygen is 4 times of hydrogen present by mass The empirical formula of the compou is 1 2 3 4 C4H502 C3HgO3 C5H603 C3H802 V

An undisturbed 1200 cms sample of sand weighs 195 N when dry The void ratios at the maximumand minimum unit weights were determined to be 0 43 and 0 92 The specifnc gravity of solids is known to be 2 73 calculate wet and dry unit weight of sand in kN m 3 2 decimal pls thank you

H He and 0 ions having same kinetic energy pass through a region of space filled with uniform magnetic field B directed perpendicular to the velocity of ions The masses of the ions H He and 0 are respectively in the ratio 1 4 16 As a result estion Type Single Correct Type 1 2 3 He ions will be deflected least 0 ions will be deflected least He and 0 ions will undergo same deflection II

At a certain temperature K 1 8 litre2 mole 2 for N 3H 2NH3 How many moles of NH3 must be placed in one litre vessel in order to get 6 mole litre H at equilibrium 1 27 88 mole fa 31 88 mole 2 40 mole 4 80 mole

Consider the froth floatation process used to remove impurity from the ore dentify the incorrect statement It is based upon the differential wetting of the ore by oil and the impurity by water The function of adding oil is to reduce the surface tension of water O Impurity come up with froth and ore is settled down Aniline can be used as a froth stabilizer

The answer to each question is a NUMERIC TYPE which can be upto 2 decimal places Marking scheme o 4 If the correct numeric answer is typed in the provided space o 0 In all other cases k XZ If highest oxidantion state of Mn Cr and O is x y and z respectively then what would be the value of y

estion 16 Which of the following solutions is expected to have the highest conductivity O 0 200 MK S04 O 0 100 M K3PO4 O 0 200 M KOH O 0 100 M KNO3

0 An example of a disproportionation reaction is JEE Main 2019 1 2MnO4 101 16H 2Mn 512 8H O 2 2CuBr CuBr Cu 3 2KMnO4 K MnO4 MnO O 4 2NaBr Cl 2NaCl Br

The unit cell of diamond is made up of 2 6 carbon atoms 4 atoms constitute ccp and two atoms occupy half of octahedral voids 8 carbon atoms 4 atoms constitute cop and 4 atoms occupy all the octahedral voids 8 carbon atoms 4 atoms form fcc lattice and 4 atoms occupy half of the tetrahedral voids alternately 12 carbon atoms 4 atoms form foc lattice and 8 atoms occupy all the tetrahedral holes Correct Answer 3 Status unattempted

2 moles of an ideal monatomic gas is expanded according to relation PT constant from its initial state P V to the final state due to which its pressure becomes half of the initial pressure The change in internal energy is 1 d P v o 2 d P v o 0 3 d 2 P o V o 5 4 d P o V

SolveLancer Test In the following reactions if initially 100 moles of A were taken then calculate sum of moles of D and C after the reaction A 2B 40 50 a 180 b 140 c 160 d 200 3B D 4C SolveLancer Test

When H O is added to an acidified solution of K Cr O7 then O O O solution turns green due to formation of Cr O3 solution turns yellow due to formation of K CrO a blue coloured compound CrO 02 2 solution gives green ppt of Cr OH 3

A reaction to convert ammonia into nitric acid involves the following chemical equation 4 NH3 g 5 O2 g 4 NO g 6 H2O g Assume that 1 50 g of NH3 reacts with 2 75 g 02 i Determine the limiting reactant ii Calculate how many grams of NO and H2O will form in the reaction above iii Calculate how many grams of the excess reactant will remain after the reaction is complete iv If the yield obtained for NO is 1 80 grams and yield obtained for H2O is 1 50 grams calculate the percent yield of NO and H2O in this reaction Atomic mass of N 14 O 16 H 1

The chemical nature of hydrogen peroxide is JEE Main 2019 1 Oxidising and reducing agent in both acidic and basic medium 2 Oxidising and reducing agent in acidic medium but not in basic medium dic 3 Reducing agent in basic medium but not in acidic medium 4 Oxidising agent in acidic medium but not in bonio lium

SolveLancer Test The converting it from to make the enamel on teeth harder by SolveLancer Test a Fluoride ions fluorapatite hydroxyapatite b Fluoride ions hydroxyapatite fluorapatite c Fluoride ions chlorapatite hydroxyapatite d None of these

Identify the number of processes with AG 0 a H O 1 0 C 1 atm H O g 0 C 1 atm b H O l 100 C 1 atm H O g 100 C 1 atm c H O 1 27 C 0 04 atm H O g 27 C 0 04 atm d H O s 10 C 0 01 atm H O g 10 C 0 01 atr e H O 1 0 C 1 atm H O s 0 C 1 atm f H O l 100 C 1 atm H O s 100 C 1 atm g H O 1 100 C 1 atm H O g 100 C 0 1 atm h H O 1 0 C 1 atm H O s 0 C 5 atm Vapour pressure of water at 27 C 0 04 atm Vapour pressure of ice at 10 C 0 01 atm

44 Henry s law constant for the solubility of N in water at 25 C is 105 atm and air is supposed to be 1 4 mixture of O and N Determine the number of moles of air dissolved in 1 mole water at 5 atm pressure acule

SolveLancer Test Select the correct statement for the reaction 2A s B g 3C g 4D l SolveLancer Test a 2 moles of A always produce 3 moles of C and 4 moles of D b 22 4 of B g produces 3 moles of C at 1 atm and 273 K in excess of A c B will always remain in excess because volume of gas is very high than solid d Moles of D produced is always less than C because volume of liquid is less than gas

Lead is a poisonous element which may lead to anemia brain and kidney diseases upon exposi to high levels of lead An ionic mechanism leads to lead toxicity due to the ability of lead ions replace ions like Ca Mg2 Fe2 and Nat Consequently the biological metabolism of cell is disturbed The metal is oxidized to the 2 charged ion in acidic solution as follows Take concentration of the lead ion as 0 025 M and the pH of the medium as 2 2 a What is Ecell

49 In the reaction NH NO aq N g 2H O the volume 49 of N after 20 min and after a long time is 40 ml and 70 ml respectively The value of rate constant is 1 log 2 1 7 20 4 log min 2 303 20 1 4 3 log min 1 log Min 2 303 20 7 log min 4 3 0 125 N min are afr ml at ar 1 1 log 20 2 3 2 303 20 log 20 2 303

SolveLancer Test Starting from the position of Mg in the modern periodic table Go one step to the left and three steps down Note the element and what will be the atomic number of that element SolveLancer Test a 37 b 19 c 55 d 879

into n comes Mis bigger a 45 completed one oscillation c 60 a 2 3 b 90 d 30 3 The amplitude of a particle executing SHM is 4 cm At the mean position the speed of the particle is 16 cm s The distance of the particle from the mean position at which the speed of the particle becomes 8 3 cm sec will be b 3 d 2 em after the c 1 4 What is the phase difference betwaon

Among the following trends of properties correct order is are Order of C O bond length is CO CO CO Order of boiling point is CH4 SiH4 GeH Order of polarity of bond HF HCl HBr Number of unpaired electrons B C N O

A chiral center with R configuration rotates the propagation plane of light in clockwise direction rotates the propagation plane of light in counter clockwise direct Is always a D configuration Is always an L configuration None of the answers provided

In August 1986 a cloud of CO gas suddenly erupted from a lake in Cameroon killing several people Which of the following could have caused this accident I Over the years CO g would have got saturated in the upper layers of the lake water II Heavy winds could have overturned the water in the lake III Over the years CO g would have got saturated in the bottom layers of the lake water IV This incident could be related to Raoult s law A I II IV B II III C II III IV D I IV

If enantiomer A has a specific rotation of 44 5 the specific rotation of the diastereomer of A must be 135 5 degrees can not be predicted with the limited information given must be 44 5 degrees plen he 445 degrees

The allowed energy levels for a rigid rotator are given by E 27 J J 1 which can also be expressed in the rotational term F J where F J where B E hc h 8 cl BJ J 1 is the rotational constant and 2hcl J J 1 J J 1 h 8n cl If the bond length in 2C 4N is 117 pm and its force constant is 1630 N m 1 As the molecule rotates more e nergetically with increasing J the c entrifugal force causes the bond to stretch slightly Write down the rot ational energy by taking the centrif

cy 176 If LPG cylinder contains mixture of butane cy and isobutane then the amount of oxygen that would be required for combustion of 1kg of it will be cy 2C4H10 1302 8CO2 10H 0 A 1 8 kg B 2 7 kg C 4 5 kg D 3 58 kg

2 For the following reaction C diamond 0 CO g AH 94 3 kcal C graphite O kcal CO g AH 97 6 The heat required to change 1 g of C diamond C graphite is A 1 59 kcal B 0 1375 kcal D 0 275 kcal C 0 55 kcal

Two liquids having vapour pressures P and P in pure state in the ratio of 2 1 are mixed in the molar ratio of 1 2 The ratio of their moles in the vapour state would be 1 1 1 3 2 1 2 1 2 4 3 2

When 5F of charge is passed through CaSO4 aq CuSO aq Al SO molten and Na SO molten then ratio of moles of substances obtained at cathode are 1 1 2 3 3 3 3 2 6 2 1 2 3 4 4 2 3 4 5

ergy of 2nd excited state of H like sample ximately then the ionisation energy is b 24 eV d 216 eV lotron moving in a 8 Which of the following represents the correct se quantum numbers of a 4d electron a 4 3 2 1 2 b 4 2 1 0 c 4 3 2 1 2 d 4 2 1 1 2 Which of the following statements is are correct f

Chlorophyll the green colouring matter of plants responsible for photosynthesis contains 2 68 of magnesium by mass How much chlorophyll contain 1 75x1024 magnesium atoms Answer in kilograms O 1 34 kg O 2 16 kg 2 64 kg O 1 45 kg D

154 When 22 4 litres of H g is mixed with 11 2 litres of Cl g each at S T P the moles of HCI g formed is equal to A 1 mol of HCI g B 2 mol of HCI g C 0 5 mol of HCI g D 1 5 mol of HCI g