Question # 1

The mass of alpha particle is equal to.

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Four times the mass of one proton

That of one hydrogen atom

That of one electron

That of one proton

The molal boiling point constant is the ration of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

Most of the reaction which give stable products are

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Exothermic

Endothermic

Isothermal

None of these

Equal masses of methane and oxygen are mixed in an empty container at 25 ^oC. The fraction of total pressure exerted by oxygen is.

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1/3

8/9

1/9

16/17

Buffer action can be explained by

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Common ion effect

Law of mass action

Le Chateller's principle

All above

Azeotropic mixture can be separated into pure components by

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Distillation

Fractional distillation

Vacuum distillation

None

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

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

One of the following substances does not undergo sublimation

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KMnO₄

Naphthalene

NH₄CI

Iodine

When a non-spontaneous redox reaction is carried out by using the electrical current, then the process is called

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Decomposition of the substances

Cracking

Hydrolysis

Electroiysis

Which of the following species has unpaired electrons in antibonding molecular orbitals.

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O2⁺²

N2^-2

B2

F2

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

In which compound oxidation state of chlorine is +5

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NaCl

HOCl

NaClO3

NaClO2

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 mathematical relation between the rate of reaction and the concentrations of the reactants is known as the

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Rate equation

Rate law

Arrhenius equation

Both a and b

When 5d orbital is completed them entering electron goes into.

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6s

6p

6d

6f

Observed pressure is less than ideal pressure for any gas due to

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Intermolecular forces

Size of molecules

Boiling point of molecules

Both a and c

In triclinic unit cell

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All axial lengths are equal

All internals lengths and angles are equal

Both axial lengths and angles are equal

Both axial lengths and angles are unequal

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