Question # 1

Which of the following has hexagonal structure.

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Sodium chloride

Potassium choride

Diamond

Graphite

Which of the following pairs of fundamental particles are present in equal numbers in a neutral atom.

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Proton and neutron

Proton and positron

Electron and proton

Neutron and electron

The efficiency of a reversible heat engine depends only on the

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Temperature of the heat sink

Temperature of the heat source

Temperature of the heat source and sink

Pressure of the fluid

Layer of the C -atom in graphite are hold together by

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Covalent bonds

Free electrons

Ionic bond

Van Dar Waals forces

The dimensions for first order rate constant are.

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s-1

s mol-1

mol-1 s-1

s

A unit cell having dimension , a = b c, alpha, beta, gama = 90^o is known as.

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Cubic

Hexagonal

Orthorhombic

None of them

The branch of chemistry which deals with the rate of reaction as well as mechanism is known as

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Wave mechanism

Classical thermodynamcis

Chemical kinetics

Phtochemistry

If there are only two components in a solution with mole fraction X_Aand X_Bthen which of the following relation is correct.

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X_A + X _B = 0

X _A + X _B > 1

XA = XB < 1

XA = 1 - XB

The large increase in the rate of a reaction on rise in temperature is due to.

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The lowering of activation energy

The decreases in mean free path

The increase in collision frequency

The increase in the number of molecules having more than the threshold energy

The atomic orbitals are progressively filled in order of increasing energy. This statement is called as

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Hund's rule

Aufbau's rule

(n+1) rule

Planck's rule

Which of the following statement is false regarding lyphilic sols.

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The colloidal particles show a linking for the dispersion medium

These are generally easy to prepare

These are more stable than lyophobic sols

The stability of the sols is mainly due to the electrical double layer

The half life period of any first order reaction.

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Is half the specific rate constant

Is independent of the initial concentration

Is always the same whatever the reaction

Is directly proportional to the initial concentration of the reactant

Isotopes are atoms whom nuclei have the same atomic number but different mass numbers. A specific isotope has an atomic number of 18 and a mass number of 35. How many electrons are there in the neutral atom.

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17

18

34

35

Which of the following has the bighest value.

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Transnational partition function

Rotational partition function

Vibrational partition function

Electronic partition function

Which of the following statements is not correct with respect to second law of thermodynamics.

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It helps in know the position of chemical equilibrium

It helps to know the position of chemical equilibrium

It determines the conversion of heat into work

It is based on Nerst heat theorem

Which of the following statement is correct.

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The wavelength of phosphorescence is less than the wavelength absorbed

Teh transition from T₁ to S₀ without the emission of light is called phosphorescence

The combination CO2 and water in plants, in the presence of chlorophyll, is an example of bioluminescence.

Population inversion is a necessary condition for laser action

For an elementary reaction

2A + B ------------------- C + D

The molecularity of the reaction is.

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1

2+

3

4

Which of the following enthalpies is always negative.

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Enthalpy of melting

Enthalpy of combustion

Enthalpy of solution

Enthalpy of formation

Smoke is a dispersion of

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Gas in gas

Gas in solid

Solid in gas

Liquid in gas

A gas obeying the van Waals equation will closely resemble and ideal gas if

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The parameters 'a' and 'b' are small

'a' is small but 'b' is large

'a' is large but 'b' is mall

None of the above

The equilibrium constants Kp and Kc are related as

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Kp = Kx Pdelta n

K p= Ks/P delta n

Ks = Kp (RT)delta n

Kx = Kp (P/RT) delta n

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