Question # 1

^{When a bonds breaks:}

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heat is absorbed

temperature increases

heat is evolved

no change in heat contents takes place

An orbital can accommodate maximum of :

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18 electrons

12 electrons

8 electrons

2 electrons

Quantum numbers are derived from

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Schrodinger wave equation

De-Broglie's equation

Bragg's equation

Planck's equation

If at 298 K the bond energies of C-H,C-C,C=C and H-H bonds are respectively 414, 347,and 435 kJ mol-1 the value of enthalpy change for the reaction H₂C = CH₂ (g) + H₂(g) → H₃C - CH₃(g) at 298 K will be

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+250 kJ

-250 kJ

+125 kJ

-125 kJ

Mass of electron

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1.6022 x 10^-19Kg

1.6022 x 10^-19g

9.10 x 10^-31Kg

9.10 x 10^-31g

Enthalpy of an exothermic reaction is always

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Positive

Negative

Zero

May be positive or negative

All of the following are state function except:

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V

q

H

P

Which have better penetrating power

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Alpha rays

Beta rays

Gamma rays

X-rays

Charge on the electron was measure by

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R.A. Milikan

J. J. Thomson

Rutherford

Faraday

The amount of heat evolved or absorbed in a chemical reaction when represented in a chemical equation is called:

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entropy of a reaction

free energy of reaction

heat of reaction

none of above

The quantum number which describe the orientation of the orbitals is

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spin quantum number

principle quantum number

azimathal quantum number

magnetic quantum number

For an exothermic reaction the sigh of enthalpy will be :

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zero

negative

positive

none of these

In chromium (Cr - 24) the number of electrons with azimuthal quantum numbers, l = 1 and 2 are respectively

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12 and 4

12 and 5

4

5

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