General Questions and Answers

extent Find out the final volume of reaction mixture Suppose F I remains constant throughout the course of reaction Problem 6 Calculate the mass in g of a 2 g atom of Mg b 3 N atoms of Mg

Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing 0 25 mole litre of ammonium chloride and 0 05 mole litre of ammonium hydroxide Calculate the concentration of aluminium and magnesium ions in the solution K NH OH 1 8 x 10 5 K Mg OH 6 x 10 10 Ksp Al OH 6 x 10 32

According to law of photochemical equivalence the energy absorbed in ergs mole is given as h 6 62 x 10 27 ergs c 3 x 10 0 cm s NA 6 02 x 1023 mol 1 196 108 a 2 2 859 10 6 c b d 2 859 105 1 196x10 6

46 For an electrolyte solution of 0 05 mol L 1 the conductivity has been found to be 0 0110 S cm The molar conductivity is 1 0 055 S cm mol 1 3 0 22 S cm mol 2 550 S cm mol 1 4 220 S cm mol

3L of a mixture of O and O having pressure of 8 21 atm at 27 C is treated with 800 ml of 2 M KI solution buffered with a borate buffer of pH 9 2 the iodine so liberated is titrated with 200 ml of 2M hypo solution The mole of ozone in the mixture Assume ideal behaviour of gaseous mixture Given R 0 0821 L atm mol K A 40 D 10 B 30 C 20

a 2 mole of CO b 2 N molecules of CO Problem 10 How many molecules are in 5 23 g of glucose C6H1206 Problem 11 How many carbon atoms are present in 0 35 mole of C6H12 Problem 12 How many nitrogen atoms are in 0 25 mole of Ca NO3 2 Problem 13 How many molecules of water are present in the one ml of

Using this diagram of carbon dioxide determine how many valence electrons each oxygen atom has after bonding with the carbon atom 000 A 8 B6 C4 D2 This metal and nonmetal have formed an ionic bond What is the name of the compound that has been formed A sodium chlorine B sodium chloride Na CI Ci C sodiumide chloride D sodiumide chloride The diagram below shows that aluminum has bonded to chlorine The proper term for this diagram is a A chemical formula B compound formula C mass formula D reaction formula AICI The name of the compound shown in the chemical formula below is AICI A aluminum chlorine B chlorine aluminide Caluminum chloride D chloroaluminum o 4 6 8 10 In the diagram below one sodium atom has bonded to one chlorine atom What type of bond has formed between these two atoms Na CI A metallic B covalent Conic D molecular When a group of active metal atoms are put together a strong force of attraction called a n develops between these atoms A lonic bond B covalent bond C metallic bond D magnetic bond A30D How many atoms make up the compound shown below AICI What is the correct formula for two molecules of sodium bromide A NaBrx2 B 2NaBr C NaBr2 D 2xNaBr

1 2 3 6 2 6 3 2 Choose the incorrect match 1 K PtCh C H4 Zeise s salt 2 Fe CO s Trigonal bipyramidal 3 CO NH3 Inner orbital complex 4 Cr NH3 Diamagnetic 3 1 2 3 4 3 6 2

Three reactions involving H PO4 are given below 1 H3PO4 H O H O H PO4 2 ii H PO4 H O H30 HPO4 2 iii H PO4 HO O H PO4 In which of the above does H PO act 4 as an acid A i only B ii only C i and ii D iii only

Will Fe OH 3 s precipitate from a buffer solution prepared by mixing 0 5M CH COOH and 0 15M CH COONa at 25 C if the solution contains 0 25M Fe Ksp Fe OH 3 4 x 10 38 K CH COOH 1 74 x 10 5

3 5 1 4 9 2 2 3 3 16 81 4 3 2 The maximum number of carbon atoms arranged linearly in the molecule CH3 C C CH CH is 1 5 2 4 3 2 4 3 How many number of atoms are there in a cube based unit cell having one atom on each corner and

A closed cylinder having volume 20 L contains 56 g N and 16 g He gases If pressure exerted by the gaseous mixture is 8 2 atm then the temperature of the gas molecules will be 245 2 K 333 3 K 425 5 K

2 3 CH C C CH 4 Cyclohexane Which of the following pairs of compounds are ring chain isomers 1 2 3 4 CH CH CH CH L I OH OH CH CI and CH CH3 and CH CH CH OH and and HO OH CH OH CH CH3

In Lassaigne s test for the detection of halogens the sodium fusion extract is first boiled with concentrated nitric acid This is 1 To dissolve Ag S 2 To remove silver halides 3 To decompose Na S and NaCN if present 4 Because Ag S and AgCN are insoluble in nitric acid

Which of the following mixture of gases do not obe Dalton s law of partial pressure O NH3 and HCI O He and N O 02 and CO O Ar and Cl

2 A heat engine carries one mole of an ideal mono atomic gas around the cycle as shown in the figure below Process 1 2 takes place at constant volume process 2 3 is adiabatic and process 3 1 takes place at constant pressure Then the amount of heat added in the 1 2 is process Pressure a 3740 J 2 T2 600 K Adiabatic 1 T 300 K Volume b 3740 J 3 T3 455 K c 2810 J d 3228 J

Draw the monomer for the following polymer O JOH otn Draw the molecule on the canvas by choosing buttons from the Tools for bonds Ator and Advanced Template toolbars The single bond is active by default

AAJ KA TOPPER The amount of solute molar mass 60 g mol that must be added to 180 g of water so that the vapour pressure of water is lowered by 10 is 1 60g 2 120g 3 30g 4 24g

3 Two solutions A and B when taken separately I the same conductivity cell had a resistance of 40 2 and 60 2 respectively If equal volumes of both the solutions are mixed then the resistance of the mixture will be Assume that there is no increase in the degree of dissociation of A and B on mixing 1 48 Q 3 52 92 2 24 Q 4 38 2

2 2 3 3 4 1 5 54 If the specific conductance of 1 M H SO4 solution is 26 102 S cm mol then the equivalent conductivity would be 1 1 3 102 S cm 1 3 13 S cm mol 2 1 6 102 S cm 4 1 3 x 103 S cm mol

Incorrect statement among the following is O In SO3 all the atoms lie in one plane O Triple bond between two carbon atoms is made up of one sigma and two pi bonds O O SF6 molecule has a regular octahedral geometry Percentage s character in sp d hybridization is 16 67

Ferric chloride FeC13 reacts with silver nitrate AgNO3 to form ferric nitrate Fe NO3 3 and silver chloride AgC1 a Write the balanced chemical equation of the reaction b If 108 5 moles of FeC13 is combined with 76 8 moles of AgNO3 how many moles of AgCl is produced c How many grams of AgC1 is produced d Which reactant is the limiting reagent e Which reactant is the excess reagent

Consider the following graph for a fixed mass of gas T2 V The correct relation between T T2 and T3 is O T T T3 O T3 T T T3 O T T3 T1 O T T T3

An excess of AgNO3 is added to 100 mL of a 0 01 M solution of dichlorotetraaquachromium III chloride The number of moles of AgCl precipitated would be 1 0 01 2 0 001 3 0 002 4 0 003

Consider the following statements a Bond angle of ammonia is greater than bond angle of H O b In BeCl central atom is sp hybridised c In CCl4 maximum four atoms are present in a plane The correct statement s is are Oa and c only O conly O a and b only O a b and c

Which one of the following is NOT an expression for Raoult s law for a binary solution containing two components A and B a PA PA XA b PTotal PA XA PB XB c AP PB XB d AP PA XA

Which of the following species can function both as oxidizing as well as reducing agent 1 Mn 2 NO 3 CIO 4 CIO One Faraday of electricity is passed through molten Al2O3 aqueous solution of CuSO and molten NaCl taken in three different electrolytic cells connected in series The mole ratio of Al Cu and Na

i 500 Mg mass of juml ii 3 34 x 10 24 g mass of hydrogen molecule 7 Express the following in the designated units i 1 54 mm s to pm s ii 25 gL to mg dL iii 25 L to m 3 iv 2 66 g cm 3 to g m v 4 2 Lh 2 to mL s 2

Consider the following graph for a fixed mass of gas P E V The correct relation between T T2 and T3 is T2 T O T T T3 O T3 T T O O T T3 T T T T3

that of potential energy Assertion Angle and angular displacement are dimensionless quantities Reason Angle is equal to arc length divided by radius

65 A diatomic gas belonging to group 15 combines with a halogen to form a trihalide which is fairly stab and inert The trihalide is 1 NCL 2 PCL 66 Which of the following statement incorrect 3 BiF 4 NF

A liquid has vapour pressure 15 x 10 Nm 2 at 298 K If the solution contains 0 2 mole fraction of a solute the vapour pressure of the solution will be a 2 8 x 10 Nm c 7 0 x 10 Nm b 7 x 10 Nm 2 d 17 5 x 10 Nm

Number of gold atoms in 300 mg of a gold ring of 20 carat gold pure gold is 24 carat ar A 4 5 100 B 6 8 x 1015 C 7 6 x 1020 D 9 5 100 From a container having AA Dvinn MON 1023

of iron are removed then the iron left If a sample of Ferric sulphate Fe SO contains 7 2 moles of O atoms then the number of S atoms in given sample are A 1 8 N B 1 2 N C 1 6 N D 1 4 N

What is the activation energy of a reaction if its rate doubles when the temperature is raised from 20 C to 35 C R 8 314 J mol K 1 15 1 kJ mol 3 269 kJ mol O por 262 2 342 kJ mol 1 4 34 7 kJ mol

C mixed proportions D none of these The respective ratio of weight of oxygen in samples of pure CuO and Cu O if both samples contain same mass of copper is A 1 2 B 1 1 C 2 1 D none of these

i Chose the correct options for following match the following A p Neutrons q p orbital r charge on electron s Lyman series a p i q ii r iii s iv c p iv q i r ii s iii B i six electrons ii 1 6 10 1 C iii Ultraviolet region iv Chadwick b p ii q i r iii s iv d p iv q ii r iii s i

1 Suppose an unknown metal sulfate is found to be 41 35 SO4 Assuming the charge on the metal is 3 determine the identity of the metal and enter the chemical formula of the unknown metal sulfate below

25 V H O solution means O 25 L O g is obtained at STP from 1 mole H O aq solution O 25 L H O aq solution will provide 1 L O g at STP O 25 L O g is obtained at STP by 1 L H O aq solution O 1 mole of O g is obtained by 25 L of H O aq solution

0 8 9 2 Paragraph for question nos Three laser guns labelled as I II and III have power 2 watt 3 watt and 5 watt Not necessary in same order are used to produce photocurrent from metal plate Number of photons emitted by laser guns are 4 x 1018 5 x 1018 and 9 x 1018 per sec Metal plate have threshold energy 4 5 x 10 19 J Neither the power nor the number of photons emitted by a particular laser gun is known and it is known that all capable photons emit a photoelectron Minimum possible wavelength of emitted photoelectron is A 680 C 480 A 08 3 30 Minimum photocurrent which must be passed through the circuit A 2 88 B 1 44 C 2 08 D None of these D 0 64 Ratio of maximum to minimum photocurrent which can be passed through the circuit A 5 4 B 9 5 C 9 4 D 9 2

3 A solution containing 2 7 10 mol of A2 ions required 1 6 10 3 mole of MnO4 for the oxidation of A to AO3 the medium use is Question Type Single Correct Type 1 2 3 4 Neutral Acidic Strong basic None of these

19 Which of the following statements is incorrect a One gram atom of carbon contains Avogadro s number of atoms b One mole of oxygen gas contains Avogadro s number of molecules c One mole of hydrogen gas contains Avogadro s number of atoms d One mole of electrons stands for 6 02 10 3 electrons

Which of the term in green chemistry is used for the process where no solvent is used A Colourochemistry B Sonochemistry skipped C No solvent chemistry

55 RR0065 What would be the equivalent weight of the reductant in the reaction Fe CN H O 20H 2Fe CN 2H O 0 Given Fe 56 C 12 N 14 O 16 H 11 1 17 2 212 3 34 4 32

7 NaBr used to produce AgBr for use in photography can be self prepared as follows Fe Br FeBr i FeBr Br Fe Brg Fe Br Na CO NaBr CO FegO Mass of iron required to produce 2 06 x 10 kg NaBr A 420 g B 420 kg iii not balanced not balanced D 4 2 x 108 g 11 C 4 2 x 105 kg If the yield of ii is 60 iii reaction is 70 then mass of iron required to produce 2 06 x 103 1 kg NaBr A 105 kg B 105 g C 10 kg D none 12

Question No 11 Density of O gas at 127 C and 0 41 atm pressure is R 0 082 L atm K moll O 0 8 g L O 0 2 g L O O 0 4 g L 1 1 2 g L 1

t O O 20 H hiles a c 3 d 13 69 Solution of a monobasic acid has a pH 5 If one mL of it is diluted to 1 litre what will be the pH of the resulting solution a 3 45 c 8 58 b 6 96 d 10 25

For an ideal solution with PA PB which of the following is true a XA liquid XA vapour b XA liquid XA vapour c XA liquid XA vapour d XA liquid and XA vapour do not bear any relationship with each other

density of SO gas with respect to methane The density of air at STP is 0 001287 g mL Its vapour density is A 143 B 14 3 C 1 43 Hint Divide with the density of hydrogen at STP i e 0 00009 g mL D 0

3 COOH The geometry of some complex ions are given against them A 4g NH Linear B C Cu NH Square planar D Ni CN Square planar The correct match is 1 A D 2 A B C Br MnCl Tetrahedral 3 A C D 4 A B C D