Question # 1

Born Haber cycle is used to determine the

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Lattice energy

Enthalpy of formation

Enthalpy of ionization

Enthalpy of dissociation

Which one of the following molecule have angle of 120 ^o

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Be Cl2

BF3

CH4

NH3

Oxidation number of Cr in a C₂CrO₄ is

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+2

+4

+6

+8

If a strip of Cu metal is placed in a solution of FeSO₄

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Cu will be precipitated out

Fe is precipitated out

Cu and Fe both dissolve

No reaction takes place

The pK_avalue of CH₃COOH is 4.74 when we mix CH₃COOH and CH₃COONa in the ratio of 10:1, tehn the pH of the buffer is

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4.74

5.74

3.74

7.00

Compound which undergo sublimation is

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KMnO4

CaCO3

NH4Cl

Na2CO3

Electromotive force of the cell is the

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Difference of two electrode potentials

May be sum or the difference of two electrode potentials

Sum of two electrode potential

Depends upon the nature of the cell

The law of mass action was given by

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D.C. down and P wage

Gay Lussic and C.M

C.M Goldberg and P. Waage

Hendeson and Le Chateller's

Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization

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Chlorine

Argon

Phosphorus

Silicon

Which statement is incorrect about Dempster's mass spectrometer.

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Solid sample can be used in this mass spectrometer

Ions are detected on the basis of mass to charge ratio

Atoms or molecules are ionized with beam of electron.

This spectrometer work at one atmospheric pressure.

At constant volume of a system remains constant and the heat is absorbed by the system, them amount of heat absorbed is called

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Enthaply change of the system

Internal energy change of the system

Total enthalphy of the system

Total internal energy of the system

Isotopes differ in.

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Properties which depend upon mass

Arrangement of electrons in orbitals

Chemical properties

None of these

The separation of the different isotopes in the mass spectrometer is done on the basis of

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Different amounts of positive changes

Charge e/m value different amounts of negative changes

Different m/e value

Velocities of the ions

Which of the given has hydrogen bonding.

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CH4

CCl4

NH3

NaCl

Two solutions of NaCl and KCl are prepared separately by dissolving same amount of the solute in water. Which of the following statements is true for these solution.

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KCl solution will have higher boiling pint than NaCl solution

Both the solutions have different boiling point

KCl and NaCl solutions possess same vapour pressure

KCl solution possesses lower freezing point than NaCl solution

The molal boiling point constant is the ratio of elevation of boiling point to

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Molarity

Mole fraction of solvent

Molality

Mole fraction of solute

Forces of attraction between He atoms are.

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Hydrogen bonding

London forces

Debye forces

Ion dipole forces

The largest number of molecule are present.

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

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