General Questions and Answers

The number of naturally occurring p block elements that are diamagnetic b 6 a 18 c 5 d 7

In the complex ion ML Mn has five d electrons and L is weak field ligand According to crystal field theor the magnetic properties of the complex ion corresponds to how many unpaired electrons ion 3 2 5 3 21 1 O caning and li pritoh 4 3

1 25 g of a sample of Na CO3 and Na SO is dissolved in 250 ml solution 25 ml of this solution neutralises 20 ml of 0 IN H SO The of Na CO3 in this sample is 2016 a 84 8 b 8 48 c 15 2 d 42 4

3 21 x mol KIO is treated with excess of KI liberates I which was dissolved in freshly prepared starch solution and it is neutralised by 60 mL 0 1 N Na2S O3 until white ppt was obtained What is x a 10 3 mol b 10 5 mol c 5 mol d 6 mol

Number of oxygen molecules having weight equal to weight of 20 molecules of SC A 100 B 50 C 15 D 8

10 mL N 100 N HC 20 mL HNO 50 mL 100 N 100 H SO4 were mixed then calculate the pH of resulting solution 1 4 2 2 3 2 3 4 6

According to first law of thermodynamics which of the following quantities represents a state function a Grev c Grev Wrev b grev Wrev d Wrev

INTERCONVERSIONS OF CONCENTRATION TERMS Calculate the mole ratio of C H OH and CH OH in aqueous solution if molality of C H OH is 40 9 mole fraction of CH OH is 0 1 in solution trys

The maximum number of molecules are present in 1 15 L of H gas at STP 2 5 L of N gas at STP 3 0 5 g of H gas 4 10 g of O gas

For the reversible reaction N g 3H g 2NH g At 500 C the value of Kp is 1 44 x 10 5 when partial pressure is measured in atmospheres The corresponding value of Kc with concentration in mole litre is 1 1 44 x 10 5 0 082 500 2 1 44 x 10 5 8 314 x 773 3 1 44 x 105 0 082 773 4 1 44 x 10 5 0 082 773

Heat exchanged in a chemical reaction at the constant temperature and pressure is known as A Internal energy change C enthalpy change A A R C B entropy change D free energy change Ra B D

The temperature at which rate of reaction is doubled as that at 300 K will be 1 300 Kb 2 300 C 125 Y

Based on the first law of thermodynamics which one of the following is correct a For an isothermal process q w b For an isochoric process AU q c For an adiabatic process AU W

What is are correct for following reaction Zn HNO3 Zn NO3 2 NO H O A Equivalent wt of HNO3 is 84 C This is disproportionation reaction B Equivalent wt of HNO3 is 21 D 65 g of Zn consume 168 g of HNC At wt of Zn 65

3 In which following set of compound ion has linear shape 1 CH NH4 BH 3 NO CO XeF 2 CO NO4 BF 4 BeCl BC CH

1 Cis Pt en Cl Br 2H O and trans Pd en Br C1 2H O are 1 Ionisation isomer 2 Geometrical isomer 3 Hydrate isomer 4 None of these

4 In which of the following change observed energy represent first ionisation energy of given element 1 Na s Nag 2 3 Mg g Mg2 g 2 F2 g F g 1 2 4 Cl g Cl g

The total number of neutrons in 36 mL of H O l or water are 1 3 NA 3 24 NA 2 30 NA 4 16 N

10 6 Some relations of Cp and Cy for an ideal gas i Internal energy U of an ideal gas depends only on the temperature T neither on the pressure P nor the volume V When an ideal gas undergoes a process involving only P V work the heat absorbed by the gas is equal to its internal energy change Therefore for an ideal gas C 89 du or dU Cydr

If the ionization energy of He is per atom then the energy of Be ion in the second 34 stationary state is 1 4 9 x 10 18 J 2 44 1 x 10 18 J 3 11 025 x 10 18 J 4 None of these

Which of the following geometrical isomerism 1 Co NH Cl lt 3 Cr en 1 complex does no show 2 Co NH NO 4 Pt gly

If the masses of Cr and O are in the ratio 13 12 in CrO3 then the ratio of O that combines with the same mass of Cr in Cr O3 and Cr O is 1 1 2 3 37 2 1 4 4 25

13 What is the mass of a molecule of CH 1 16 g 2 26 6 x 1022 g 3 2 66 x 10 23 g 4 16 Ng uing has the highest mass 11

Example 1 If we have 6 w w urea solution with density 1 060 g mL then calculate its strength in

One mole of an ideal gas expands freely and isothermally at 300 K from 10 litres to 100 litres If AU 0 the value of AH is b 200 kJ d 300 kJ a 10 kJ Loke Zero

Supposing the I P of H atom is 800 eV Find out the valve of principle quantum number having the energy equal to 50 eV 1 n 2 2 n 3 3 n 4 4 n 1

1 575 g of oxalic acid COOH 2 xH O are dissolved in water and the volume made upto 250 mL On titration 16 68 mL of this solution requires 25mL of N 15 NaOH solution for complete neutralization Calculate x

If a mixture of gases has a total pressure of 100 cm in the Hg and the partial pressure of nitrogen mixture is 25 mm Hg then the per cent of nitrogen in the mixture is a 4 b 40 c 400 d 2 5

In a sample of NH3 g 18 x 1022 atoms of hydrogen are present then find out the volume of NH g at STP 1 2 24 L 3 4 48 L 2 1 12 L 4 6 72 L

60 mL 0 1 M KMnO4 is treated with excess of FeC 0 n presence of H SO4 The volume of CO gar measured at STP obtained is 1 448 mL 3 224 mL 2 672 mL 4 112 mL

3 Zn reduce Mg2 4 Zn reduces Fe2 2 Deduce from the following E values of half cells what combination of two half cells would results in a cell with the largest potential I A eA E 0 24 V II BO eB III C 2e C iv D 2e D 1 II IV 3 III IV E 1 25 V E 1 25 V E 0 68 V 2 II III 4 I II all reaction

7 A gas deviates from ideal behaviour at a high pressure because its molecules a attract one another b show the Tyndall effect c have kinetic energy 1 bu noualent bonds

The weight of one molecule of a compound C6H122 is 60 1 1 2 x 10 20 gm 2 1 4 x 10 21 gm 3 5 025 x 10 3 am

9 The atomic weight of a metal M is 27 and its equivalent weight is 9 the formula of its chloride will be 1 MCL 3 M Cl 2 MC1 4 MCL3

2 76 g of silver carbonate on being strongly heated yields a residue weighing Ag CO 2Ag CO 2O 2 2 2 48 g 4 2 64 g 1 2 16 g 3 2 32 g

Which reaction does not involve neither oxidation nor reduction 1 VO V 03 3 Cro2Cr 0 2 Na Na 4 Zn Zn

UMP 5 A glass bulb of 1 litre capacity contains 2 10 1 molecules of nitrogen exerting pressure of 7 57 x 10 Nm 2 Calculate the root mean square speed and the temperature of gas molecules If the ratio of up to Urms is 0 82 calculate up for these molecules at this temperature IIT 1993

disproportionation reaction Cr 0 1 CrO5 2 103 I H I 3 CrO Cl NaOH Na CrO4 NaCl H O 4 Na S O3 H SO4 Na SO4 SO2 S8 H O

6 Which of the following statements is incorrect a Pure sodium metal dissolves in liquid ammonia to give blue solution b NaOH reacts with glass to give sodium silicate c Aluminium reacts with excess NaOH to give Al OH 3 d NaHCO on heating gives Na CO3

molarity 1000 1000xd molarity xm late molarity of CaCO aq solution which has concentration of CaCO molality 200 p

Q 50 An aqueous solution of KIO3 was treated with excess of KI solution The solution is acidified HCl The liberated I2 consumed 10ml of 1 0M thiosulphate solution to decolourise starch iodine cor Then millimoles of KIO3 consumed are

1 c c N O at NTP contains 1 8 224 1 2 3 x102 2 atoms 6 02 22400 1 32 224 x1023 molecules 23 10 3 electrons AS ATT of above

5 If the four tyres of car are filled to the same pressure with N O H and Ne separately then which one will be filled first 1 N 3 H 2 0 4 Ne

A solution containing 2 68 x 10 3 mol of An ions requires 1 61 10 3 mol of MnO2 for the complete oxidation of Ant to AO in acidic medium What is the value of n

A certain ion Xn is oxidized successively to XO2 and then XO by a powerful oxidizing agent If the number of moles of the oxidizing agent required in the successive steps of oxidation are in the ratio 4 1 n is 1 3 3 2 2 1 4 4

95 Molar enthalpy of combustion for C H g C graphite and H g are 1300 394 and 286 KJ mole respectively then calculate of C C bond in KJ mole AHSub C graphite C graphite 715 KJ mole AHRE H H 436 KJ mole BE AHRE C H 413 KJ mole BE 1 415 3 1215dal 2 610 4 814

25 The volume in mL of 0 1 M AgNO3 required to completely precipitate the chloride ions present in 30 mL of 0 01 M of Cr H O 5CI Cl as silver chloride is close to

If the weight of metal chloride is x gram containing y gram of metal the equivalent weight of metal will be 1 E x35 5 y 3 E Yx35 5 x y 2 E 4 E 8 y x X 8 x y y

0 2 g of a sample of H O2 required 10 ml of IN KMnO4 in a titration in the presence of H SO4 Purity of H O2 is A 25 C 85 B 65 D None of these of KMnO that will be needed

In chromite ore the oxidation number of iron and chromium are respectively a 3 2 b 3 6 c 2 6 d 2 3