General Questions and Answers

23 Which of the following a AgCl b KC1 is least ionic c BaCl d CaCl

5 What systems did the EEIC put in place to ensure indigo cultivation in India

Gold number is a measure of a protective action by a lyophilic colloid on a lyophobic colloid bug c b protective action by a lyophobic colloid on a lyophillic colloid WITCHIN c number of mg of gold in red gold solblog lebi d stability of gold sol iste gi de grivollot od to doidW ixtl 5 a b c c 90 T

Dinitrogen oxide Nitrogen I oxidel Nitrogen monoxide Nitrogen II oxide Dinitrogen trioxide Nitrogen III oxide Nitrogen dioxide Nitrogen IV oxide Dinitrogen tetroxide Nitrogen IV oxide N O NO N O3 NO N O4 Dinitrogen pentoxide N 0 Nitrogen V oxide nitrogen 1 2 3 4 4 5 prepara NH NO3 N O 2H O 2NaNO 2FeSO4 3H SO4 colourless gas neutral Fe SO4 2NaHSO 2H O 2NO 2NO N O4 2Pb NO3 2NO 250K Cool Heat 673K 4NO 2PbO 0 2N O3 N O4 4HNO3 P4010 colourless gas neutral 4HPO3 2N O5 blue solid acidic brown gas acidic colourless solid liquid acidic colourless solid acidic

The molecules that will have dipole moment are A 2 2 dimethylpropane C cis hex 3 ene 1 B trans pent 2 ene D 2 2 3 3 tetramethylbuta

76 Which one of the following emulsifying agents helps in the formation of w o emulsion a Proteins c Insoluble soaps 201 M b Gums d Soluble soaps electrolyte which is able

1 Two point charges A and B having charges l and Qrespectively are placed at certain distance apart and force acting between them is F If 25 charge of A is transferred to B then force between the charges becomes a F 16 F b 9 F 16 4 F

The correct order of increasing bond angles in the AIPMT Prelims 2010 following species are 1 CI O CIO CIO 2 2 CIO CI O CIO 2 3 CI O CIO CIO 4 CIQ CI O CIO

1 2 g sample of Na CO3 and K CO3 was dissolved in water to form 100 ml of a solution 20 ml of this solution required 40 ml of 0 1 N HCI for complete neutralization Calculate the weight of Na CO3 in mixture If another 20 ml of this solution is treated with excess of BaCl2 what will be the weight of precipitate

How many grams of urea on heating yield 1022 molecules of biuret by the reaction 2 CO NH H N CO NH CO NH NH B 0 995 A 1 495 C 1 99 D 1 753

4 Bond length is unpredictable 3 Bond length in NO is greater than NO The states of hybridization of boron and oxygen atoms in boric acid H BO3 are respectively 4 sp and sp 1 sp and sp A 2 sp and sp3 3 sp and sp Which one of the following has the regular tetrahedral structure 11 VDr AIE TAIF

5 Co CN a complex ion of cobalt 1 aberts radiation in violet region of the visible light Its aqueous solution therefore appear 1 Pink 3 Blue 2 Orange 4 Yellow

4 perature log 2 0 3 Calculate pH of following solutions a 0 1 M HCl b 0 1 M CH COOH K 1 8 x 10 5 log 1 8 0 13

ii 7 of silk The scientific name of mulberry plant is Pupa of silk moth is called and

71 Oxidising product of substance Na AsO would be 2 AsO 4 AsO 1 As 0 3 AsO 4

0 01 M HA aq is 2 ionized solution is 1 2 x 10 4 2 10 8 3 2 x 10 11 4 2 10 12 vijesno toenting VEG

How many metallic ores are concentrated by magnetic separation method from the given ores Cassiterite Pyrolusite Rutile Magnetite Galena Cinnabar

111 The dispersed phase in colloidal iron III hydroxide and colloidal gold is positively and negatively charged respectively Which of the following statements is not correct b a Mixing the sols has no effect nonjetal Mon Sbirl 08 b Coagulation in both sols can be brought about by Ons 16000 12 201 011 6 electrophoresis aquest c Magnesium chloride solution coagulates the gold sol more readily than the iron III hydroxide sol d Sodium sulphate solution cause coagulation in both QUOND sols TISDIONOS DITS SLL mod c d 120 It 121

5 Statement 1 Statement 2 In water orthoboric acid behaves as a weak monobasic acid In water orthoboric acid acts as a proton donor 105 A Statement 1 is True Statement 2 is True Statement 2 is a correct explanation for Statement 1 B Statement 1 is True Statement 2 is True Statement 2 is NOT a correct explanation for Statement C Statement 1 is True Statement 2 is False D Statement 1 is False Statement 2 is True

2 In a reaction container 100 g of hydrogen and 100 g gas What of Cl are mixed for the formation of HCl is the limiting reagent and how much HCl is formed in the reaction est a H is limiting reagent and 36 5 g of HCl are formed b sdW d Cl is limiting reagent and 102 8 g of HCl are formed c H is limiting reagent and 142 g of HCl are formed Cl is limiting reagent and 73 g of HCl ar formed

Elements after atomic number 103 have not been discovered till now If an element with atomic number 106 were ever discovered which of the following electronic configuration will it possess AIIMS 1982 a Rn 5f 4 6d4 7s c Rn 5f 4 6d 7s b Rn 5f 4 6d 7s d Rn 5f 4 6d 7s 7p

During an adiabatic expansion of 2 moles of a gas the change in internal ene ound to be equal to 100J The work done during the process will be equal to 42 100 J 4 100 J zero 3 200 J

Molality of 1M solution of NaNO solution Density of solution is 1 25 g mL and mol wt of NaNO 85 g mol is a 1 286 m 19 en viena b 4 44 m b 4 44 mondo d None of these da SE 1 0 c 0 858 m 1 6 6 x II

A 5 B 4 C 3 The oxidation states of the most electronegative element in the products of the reaction of BaO with dilute H SO4 JEE 1991 A 0 and 1 For the redox reaction B 1 and 2 C 2 and 0 D 2 and 2 JEE 1992

4 08g of a mixture of BaO and unknown carbonate MCO3 was heated strongly The residue weighing 3 64g was dissolved in 100mL of 1 N HCl The excess acid required 16mL of 2 5 N NaOH solution for complete neutralisation Identify the metal

Which of the following compounds will show highest dipole moment JEE MAINS 2017 Onli I Dan m O II CUIT O IV O

52 In which of the following reaction H O acts as reducing agent 1 2FeCl 2HCl H O 2FeCl3 2H O 2 2 Cl H O 2HCl O 3 2HI H O 2H O 1 2 4 H SO H O H SO H O

64 For which of the following molecule significant 0 CI 1 fo CI 5 1 Only 3 Am 2 CN CN 2 3 and 4 3 OH OH 3 Only 1 SH J 4 PUT SHOOD JAB 4 1 and 2

How many moles of Ca3 PO4 2 will contain 0 20 mol of oxygen atoms How many gm of HCI is needed for complete reaction with 69 6 g MnO HCI MnO MnCl H O Cl

Assigned Mass of Temperature evaporating C dish cover 10 20 30 40 50 60 70 80 37 81 g 37 65 g 36 95 g 37 80 g 36 50 g 37 75 g 35 98 g 37 81 g Mass of evaporating dish cover KCI solution 48 75 g 50 42 g 47 82 g 48 19 g 47 49 g 50 08 g 48 29 g 48 64 g Mass of evaporating dish cover dry KCI 40 54 g 40 99 g 39 81 g 40 63 g 39 75 g 41 52 g 39 86 g 41 37 g 5 Mass of KCI 4 2 6 Mass of water 3 4 7 Mass of KCI per 100 g of water

A small amount of sodium chloride NaCl is dissolved in a large amount of water Imagine separating this process into the four stages sketched below These sketches show only a portion of the substances so you can see the density and distribution of atoms and molecules in them A D NaCl H O Use these sketches to answer the questions in the table below B The enthalpy of solution AH is positive when soln NaCl dissolves in water Use this information to list the stages in order of increasing enthalpy Would heat be absorbed or released if the system moved from Stage A to B What force would oppose or favor the system moving from Stage A to B Check all that apply 0 00 absorbed released neither absorbed nor released none ionic bonding force covalent bonding force metal bonding force hydrogen bonding force dipole force C ion dipole force dispersion force DO X solution 5 13

Specific Gravity Measure the specific gravity in the image below and input your answer Answer must include 3 significant figures 1 070 1 060 1 050 1 040 1 030 1 020 1 010 1 000 20 C 100 80 60 40 20 0 0

C4 C5 C6 C7 4 sp sp 3 8p H H CA Cs d H 4 f Methyl methacrylate H C H H

Number of equivalent of HCI present in 100 mL of its solution whose pH is 4 H HZ nouday 1 10 4 2 10 3 3 10 2 4 10 5

Suppose 4 61 g of zinc was allowed to react with hydrochloric acid to produce zinc chloride and hydrogen gas How much zinc chloride in grams should you get 1 Zn s 2 HCl aq 1 ZnCl2 aq 1 H2 g

a Many important compounds in the chemical industry are derivatives of ethylene C2H4 One is acrylonitrile What are the indicated bond angles in acrylonitrile angle a angle b angle c a H H 120 Acrylonitrile 1200 900 109 5 1800 1200 N

Sigma bonds can form between different types of orbitals The main criterion for sigma bond formation is that the two bonded atoms have valence orbitals with lobes that point directly at each other along the line between the two n The images below show the shapes of two orbitals on adjacent atoms Choose all of the combinations that will lead to formation of a sigma bond Select all that apply O O d 2 2 day W

o bonds bonds a H H C H C2 S Acrylonitrile

2 A student needs to determine the density of two metal objects The first object is a cube and the second object is a rectangular bar The student uses calipers to measure the length of the objects a What is the density in grams per milliliter of the metal cube if it has a mass of 84 55 g and an edge length of 2 16 cm b mL What is the density in grams per milliliter of the rectangular bar if it has a mass of 186 7 g and measures 4 26 cm in length 1 42 cm in width and 13 21 cm in height mL

9 What type s of intermolecular forces exist between NH3 and PO43 A dispersion forces B dispersion forces ion dipole and dipole dipole C dispersion forces and dipole dipole D dispersion forces and ion dipole E dispersion forces ion dipole dipole dipole and hydrogen bonds OE dispersion forces ion dipole dipole dipole and hydrogen bonds OC dispersion forces and dipole dipole OD dispersion forces and ion dipole B dispersion forces ion dipole and dipole dipole OA dispersion forces

Use the mass spectrum of strontium to estimate the atomic mass of strontium A atomic mass Value Units A 50 84 86 Mass amu Estimate the mass and percent intensity values from the graph to three significant figures The peak representing Sr 84 has a percent intensity of 0 700 the peak representing Sr 86 has a percent intensity of 11 9 the peak representing Sr 87 has a percent intensity of 8 50 the peak representing S a percent intensity of 100 Express your answer to three significant figures and include the appropriate units Intensity 100 87 88

What would be the reading of the liquid in the following graduated cylinder reported to the proper number of significant figures 6

You are given the following substances with their melting and boiling points Substance Melting point C Boiling point C X 219 Y 119 Z Identify the physical states of X Y and Z at room ton 680 449 78

9 Using the Model screen add bonding domains to the central and dashes from Model 2 draw each molecule s shape Bonding Domains Around Central Atom 2 3 4 Drawing of Shape 101 Electron Geometry Linear Bond Angles 180

Which of the choices below shows the correct method for converting 50 g into ounces 18 454 grams g 1 0 pound lb 16 ounces oz 1 0 pound lb Select one 50g 10 1 8oz 1 0lb 50g 454g 1602 1 8oz 50g 454g 1 0lb 10 1 80z 1 0lb 50g 101h 160z 1 8oz SODA 50 g

2 Having now performed two chromatogram experiments suggest two possible applications for paper chromatography other than the identification of metal ions Admittedly your experience is limited here but let your imagination go 3 During a chromatography experiment a student calculated two R values They are A 0 62 and B 0 30 The solvent front for the original chromatogram was 12 0 cm If A and B were run on a second chromatogram and the solvent front was 25 0 cm how far apart would A be from B

Although fluorite is its chief mineral source fluorine can also be obtained as a by product of the production of phosphate fertilisers These fertilisers are derived from phosphate rock 3Ca3 PO4 2 CaF2 What is the maximum mass of fluorine that could be extracted as a by product from one ton of phosphate rock a 75 39 kg F2 b 37 68 kg F2 c 15 kilomoles F2 d 18 84 kg F2

In the narrative Tom lures his friends into whitewashing the fence while he enjoys with the things he gets in exchange Which of the following phrases describes how more of his friends became victims O alacrity in his heart O with reluctance in his face the slaughter of more innocents

pands then the external pressure is less than the pressure of the system Thus Per Pin dp If compressed Per P of system thus Per cat cams stage pin dp General equation Pea Pintap can u explain why it is Pin dp minus in the first case and Pin dD plus in the second caro

4 Consider the reaction 2x g 3y g 2zig constant temperature and volume partial pressure of x p varies as follows Time min 0 P mm Hg 800 400 200 200 Order of the reaction is 1 0 2 1 2 0 5 4 2 temperature having energy gre 7 38 1 2 7 3 25 57 If two first K gets doubled when the 17 C By what m C K 1