Question # 1

When external pressure is 23.7 torr, boiling point of water is

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100 ^oC

200^oC

98^oC

25^oC

Acetone and chloroform are soluble in each other due to.

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Intermolecular hydrogen bonding

Dipole dipole interaction

Instantaneous dipoles

All of the above

The unit of the rate constant is the same as that of the rate of reaction in

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

Many elements have fractional atomic masses. This is because

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The mass of the atom is itself fractional

Atomic masses are average masses of isobars

Atomic masses are average masses of isotopes

Atomic masses are average masses of isotopes proportional to their relative abundance

When water freezes at 0°C, its density decreases due to

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Cubic structure of ice

Empty spaces present in the structure of ice

Change of bond lengths

Change of bond angles

Which of the following species has unpaired electrons in anti bonding molecular orbitals

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O2

N2

B2

F2

The e/m value for the positive rays in maximum for the gas.

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Helium

Oxygen

Nitrogen

Hydrogen

Which substance is nto a dehydrating agent.

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CaCl3

CdCl2

Silica gel

P2O5

When aqueous NaCl is electrolyzed, which of the following ions gas discharged at anode.

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Cl-

OH-

Na+

H+

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

How many moles of water results by burning 4 mole of H2 with excess of oxygen.

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1 mol

2 mol

3 mol

4 mol

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

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Cu will be precipitated down

Fe is precipitated out

Cu and Fe both dissolve

No reaction takes palce

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 formula will be used to determine the number of in electrons sub shell of an atoms.

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2(l+1)

2(2l+1)

(l+1)

(2l+1)

During chromatography strip should be dipped into solvent mixture to a depth of.

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3-4 mm

4-5 mm

5-6 mm

6-7 mm

Quantum number value for 2p sub shell are

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n = 2, I = 1

n = 1, l =1

n = 1, l = 0

n = 2, l = 0

For the equilibrium system N2 + O2 + Heat = 2NO the equilibrium constant deceases by

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Decreasing the temperature

Adding a catalyst

Adding N2

Adding NO

The pH of 10-3 mole dm-3 of an aqueous solution of H2SO4 is.

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3.0

2.7

2.0

1.5

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