General Questions and Answers

10 ml of a mixture of CO CH4 and N2 exploded with an excess of oxygen gave a contraction of 6 5 ml There was a further contraction of 7 ml when the residual gas treated with KOH Find the volume of CO CH4 and N 2 respectively is

Fe5C2 produced from martensite during tempering at 1000C Assuming that martensite is formed during isothermal transformation of 15 kg wrought iron ferrite 70 purity kg E carbide 9 86 O 8 79 10 62 O 11 40 O 12 04

pH of 10 M HCI aqueous solution is nearly Options 2 4 7 10 Solution Answer 3

The ratio of moles of water as water of crystallisation in CaCl and SrCl is 1 2 2 1 hr n 1 1

Which among the following cannot show disproportionation Options PH3 H O S 8 HCIO Solution

SolveLancer Test What is the effect on boiling point of a particular substance on Venus and Mars w r t Earth SolveLancer Test a Increase Decrease b Increase Increase c Decrease Decrease d Decrease Increase a

1 If absorbance of the fertilizer solution corresponds to the concentration of 2 78 x 104 M PO4 what would be the concentration of P O5 O 0 01916 g L O 0 057498 g L O 0 07664 g L 09 0 3832 g l

c hydrogen bonding interactions d dipole dipole interactions 1997 8 For two ionic solids CaO and KI identify the wrong statement among the following a CaO has high melting point b Lattice energy of CaO is much larger than that of KI c KI has high melting point d VI

The reactant which is used to precipitate th IVth group basic radical and the type o precipitation will be 1 H S dil HCl Sulphide 2 NH OH NH4Cl Chloride 3 NH OH NH4Cl Hydroxide 4 H S NH4OH Sulphide

When potassium chlorate KCIO3 is strongly heated it gives KCI and 02 The percent loss in weight after heating a pure sample of KCIO3 is nearly At wt of K 39 CI 35 0 16 amu KCIO s KCI s 0 g O 40 O 60 O 50

Which of the following is the laboratory method of preparation of dihydrogen Electrolysis of warm aqueous barium hydroxide solution between nickel electrodes Reaction of steam on hydrocarbons at high temperatures in the presence of catalyst Donction of zing with aquQOUS alkali

i How structure of a co valent molecule can be determined from dipole moment data Explain with example The dipole moment of chlorobenzene is 1 55D The bond distance of C H CI is 2 8 Estimate the percentage of ionic character of the bond 2 2

150 The ratio of mass percent of C and H of an organic compound C H O is 6 1 If one molecule of the above compound C H O contains half as much oxygen as required to burn one molecule of compound C H completely to CO and H O The empirical formula of compound C H O is A C H O C C H O B C H O 3 D C H O 2

An amino acid residue in a protein structure is found to adopt the following backbone 4 values 130 130 This amino acid is UNLIKELY to be a lysine residue a proline residue a serine residue a glycine residue

C Grams of Al2 SO4 containing 32 amu of S A chemical compound dioxin has been very much in the news in the past few years It is the by produc of herbicide manufacture and is through to be quite toxic Its formula is C 2H CL O If you have a sampl of dirt 28 3 g that contains 8 78 x 10 moles of dioxin calculate the percentage of dioxin in the di

Selecting and Handling Reagents and Other Chemicals PROBLEM A purifying agent is required in sugar industry to clarify extracted cane juices EXPLAIN what class based on purity of purifying agent must be used

47 Incorrect match among the following Maximum Complex 1 Co NH3 6 C13 2 Co NH3 5Cl Cl2 3 Co NH3 4Cl CI 4 Co NH3 3C13 AgCl ppt given 3 moles 2 moles I moles 0 moles Total ions in water 4 3 2 1

Example of redox reaction is Options Na HCI NaCl H Na O 2HCI 2NaCl H O 2 NaOH HCI NaCl H O Na CO3 2HCI 2NaCl H O CO Solution Answer 1 NCERT Reference Redox reaction XI part 2 Page No

21 Xylem and phloem are responsible for 1 poin O a Conduction of water and food O b Conduction of water and mineral O c No roll in lower plants d None of these

143 In the ionic equation 2K BrO3 12H 10e Br 6H O 2K the equivalent weight of KBrO3 will be B M 2 A M 5 D M 4 C M 6 where M molecular weight of KBrO3

5 The relationship between osmotic pressure P at 273 K when 10 g glucose P 10 g urea P and 10 g sucrose P3 are dissolved in 250 ml of water is 1 P P P3 1 2 2 P P P3 2 1 3 P2 P3 P 1 C C

Mass of CaCO3 required to react completely with 320 mL of 0 25 M HCI is Options 4 g 8 g 6 5 g 12 5 g Solution

Question No 30 40 Detection of equivalence point with indicator is difficult AO Autoprotolysis constant for different solvents are available BO Dielectric Constant are very high for different solvents CO All of these DO Equilibrium constant are not available

3 In the case of osmosis solvent molecules move from solution having 1 Higher vapour pressure to lower vapour pressure 2 Higher concentration to lower concentration 3 Lower vapour pressure to higher vapour pressure 4 Higher osmotic pressure to lower osmotic

Which of the following compounds is present in maximum percentage in Portland cement CaO SiO Al2O3

If 70 g nitrogen gas is reacted with 12 g of hydrogen gas then the mass of ammonia produced in the reaction will be Options 92 g 86 g 68 g 72 g Solution Answer 3

Write down the atomic valency of the fir st 90 elements Write one by one valency of these elem ents Don t write any method only right valency Don t reject this question as my mentor

ch of the following statement is correct a Molecular mass of dry air is less than moist air b Molecular mass of dry air is greater than moist air c Molecular mass of dry air is equal to moist air d Molecular mass of dry air may be greater or less than moist air

2 Using the data given below find out the strongest reducing agent Ec cr 1 36 V 2 Cr O Cr3 1 33 V 1 33V E 2 A Mn MnO4 Mn 3 C Cr 1 51V 1051V 1 36V 1 36V1 3 ECr Cr 0 74 V LB Cr 0 74V

II Applicatio 1 Balance the following chem a Calcium hydroxide s Nitric acid b Magnesium s lodine s Magnesium lodide s 2 Write the following chemical reactions including the physical states of the substa balance chemical equations AS a Sodium Hydroxide reacts with Hydrochloric acid to form Sodium Chloride b Barium Chloride reacts with liquid Sodium Sulphate to leave Barium Su precipitate and also form liquid Sodium Chloride Higher Order Thinking Questions 2 moles of Zinc reacts with a cupric choloride solution containing Formula units of CuCl Calculate the moles of copper obtained AS ZnCl Cu s Zn CUCI aq 2 aq mole of propane C H on combustion at STP gives A kilo joules of aliculate the heat libarated when 2 4 ltrs of propane on combustion a liculate the mass and volume of oxygen required at STP to conv

A solution of 5 gm of Haemoglobin molecular weight 64000 in 100 cc of solution shows a temperature raise of 0 031 C for complete oxygenation Each mole of haemoglobin binds 4 mole of oxygen If the heat capacity of the solution is 4 18 k cm calculate AH per gm mole of oxygen bond

The following reaction NH4Cl s NH3 g HCl g have 2 phases 2 constituents 3 components 3 phases 3 constituents 3 components Ob OC O d 2 phases 3 constituents 3 components 2 phases 3 constituents 1 component

A liquid solvent is added to a flask containing an insoluble solid The total volume of the solid and liquid together is 80 0 mL The liquid solvent has a mass of 28 9 g and a density of 0 865 g mL Determine the mass of the solid given its density is 1 75 g mL

In the Kjeldahl s method for estimation of nitrogen present in an organic compound ammonia evolved from 0 8 g of organic compound neutralizes 20 ml of 0 8 M H SO4 The percentage of nitrogen in the organic compound is 28 56 O 33

Consider the reaction represented by the equation 25O g O2 g 2SO3 g For the system at chemical equilibrium which of the following explains what happens after the addition of sulfur trioxide assume constant temperature The amount of SO3 g increases and the value for K stays the same The amount of SO3 g increases and the value for K increases O The amount of SO3 g decreases and the value for K stays the same O The amount of SO3 g decreases and the value for K increases O The amount of SO3 g stays the same and the value for K decreases

53 Which of the following substituted carboxylic acid has the highest K value 1 CH CH CH COOH Cl 3 6 2 CH CH CH COOH 3 CH CH CH COOH 1 4 CH CH CH COOH

If the molecularity of an elementary reaction is two whereas its order is one then the reaction is known as O Second order reaction Pseudo first order reaction O Pseudo unimolecular reaction Both 2 and 3 SEUDO FIRST ORDER REACTION For an elementary chemical reaction the order is same as molecularity In several reactions the order is different from molecularity This is particularly the case when one of the reactants is present in large excess The molecularity of acidic hydrolysis of sucrose and ester is two where as its order is one So such reactions coudo first order reaction

104 105 106 110 111 112 116 117 118 122 123 124 Two long straight wires carrying equal currents but in opposite direction are 8 cm apart They produce net magnetic field of 200 T midway between them The magnitude of current in each wire is OPTIONS MARK FOR REVIEW CLEAR SELECTION

Which one of the following describes better the triple point This point has the highest T and the lowest P in the phase diagram Oa The three phases coexist with a zero degree of freedom O b At the super critical fluid state The three phases coexist with one degree of freedom Od

The specific rotation of enantiomer A is 87 3 A mixture of enantiomer A and A the enantiomer of A is subjected to polarimetry and an observed rotation of 34 2 is obtained what is the EE for this mixture 39 2 A 60 8 A 39 2 A

Given O2 g 20 g NO g O3 g NO2 g O2 g 302 g 203 g What is the standard reaction enthalpy for the following reaction NO g O g NO2 g O 355 kJ mol O 555 kJ mol 306 kJ mol 592 kJ mol 306 5 kJ mol AH 498 4 kJ mol AH 200 0 kJ mol AH 285 4 kJ mol

Number of atoms in 0 2 g molecule Br308 is molar mass of Br308 is 368 g mol 0 22 NA 2 2 NA 0 2 NA 0 2 368 Read More x11NA only one is correct

2FAF5 AF3 For the above change which statement is correct 1 Central atom A belongs to 15th group 2 In each step two coordinate bonds are formed 2F AF7 III 3 Central atom A has five electron in p subshell of its valence she 4 No such change is possible

In the electrolysis of KI I is formed at the anode by the reaction 2 1 2e After the passage of current of 0 5 ampere for 9650 seconds I formed required 40 ml of 0 2 M Na S O3 5H O solution in the reaction 12 25 03 What is the percentage current efficiency 16 48 32 21

2 3 moles of a certain gas are confined in a cylinder Calculate the expansion work when the gas expands isothermally and reversibly from an initial vol of 0 5L to a final volume of 2 5L at 30 C O a 92 03 kJ O b 92 03 kJ Oc 9 3kJ O d 3 7 kJ

ic species 5 Which is incorrect statement 1 N has greater dissociation energy than N 2 O has lower dissociation energy than 0 O 3 Bond length in N is less than N 4 Bond length in NO is less than in NO

The decomposition of a certain mass of CaCO3 gave 11 2 dm of CO gas at STP The mass of KOH required to complete neutralise the gas is 1 28 g 2 56 g 3 14g 4 1 2 g The Vividh Bharti Station of All Indian Radio

Equal volume of 0 2 N Na SO4 and 0 1 N BaCl solutions are mixed together Assume that BaSO4 is completely insoluble If Ku H O 0 52 K kg mol what would be the normal boiling point of the resulting solution Assume molality molarity O 100 15 C O100 75 C 100 091 C 100 175 C

During electrolysis of H SO4 aq with high charge density Marshall s acid formed as a by product In such electrolysis 22 4 L H g and 5 6 L O g liberated at STP at electrode The number of moles of Marshall s acid formed is x the value of x is 1 0 25 2 0 5

16 The energy absorbed by each molecule A 23 The of a substance is 4 4 x 10 19 J and bond energy per molecule is 4 0 10 19 J The kinetic energy of the molecule per atom will be a 2 2 10 9 J c 4 0 10 20 J b 2 0 10 9 J d 2 0 10 20 J 2009 7 If a gas expands at constant temperature it per r a c 24 At w N w at 50