DEMOEXAM | ScoreExams

Question 1 of 10

The rate of a First order reaction 0.04 {tex}mol^{-1} S^{-1}{/tex} at 10 seconds 0.03 {tex}mol^{-1} s^{-1}{/tex} at 20 seconds after intiation of reaction. The half life period of the reaction is

A24.1s

B34.1s

C44.1s

D54.1s

Question 2 of 10

The least stable free radical is

A

{tex} CH_{3}CH_{2}{/tex}

B

{tex}CH_{3}CH_{2}CH_{2}{/tex}

C

{tex} (CH_{3})_{2}CH{/tex}

D

{tex} CH_{3}{/tex}

Question 3 of 10

The angle of minimum deviation in an equilateral prism of refractive index 1.414 is

A60°

B30°

C90°

D45°

E15°

Question 4 of 10

In Young's double slit experiment, the width of one of the slits is slowly increased to make it twice the width of the other slit. Then in the interference pattern:

Athe intensity of maxima increase while that of minima decrease

Bintensities of both maxima and minima decrease

Cthe intensities of both maxima and minima remain the same

Dthe intensities of both maxima and minima increase

Question 5 of 10

An organic compound A(C₄H₉Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative. A is

At-butyl chloride

Bs-butyl chloride

Cisobutyl chloride

Dn-butyl chloride

Enone of these

Question 6 of 10

Standard enthalpy and standard entropy change for the oxidation of {tex}NH_3{/tex} at 298 K, are {tex}-382.64 kJ mol^{-1}{/tex} and {tex}-145.6 J mol^{-1}{/tex} respectively. Standard Gibbs energy change for the same reaction at 298 K is :

A{tex}-221.1 kJ mol^{-1}{/tex}

B{tex}-339.3 kJ mol^{-1}{/tex}

C{tex}-493.3kJ mol^{-1}{/tex}

D{tex}-523.2 kJ mol^{-1}{/tex}

Question 7 of 10

Chloroform gives a trichloro derivative of an alcohol on reaction with

Aconc. nitric acid

Baq. alkali

Cacetone and alkali

Dsodium ethoxide

Ea primary amine and an alkali

Question 8 of 10

A

B

C

D

E

Question 9 of 10

A solution of urea (mol. Mass 60g {tex}mol^{-1}{/tex}) boils at {tex}100.18^\circ{/tex} C at the atmospheric pressure. If {tex}K_f{/tex} and {tex}K_b{/tex} for water are 1.86 and 0.512 K kg {tex}mol^{-1}{/tex} respectively, the above solution will freeze at

A{tex}-6.54^\circ{/tex}

B{tex}-0.654^\circ{/tex} C

C{tex}6.54^\circ{/tex} C

D{tex} 0.654^\circ{/tex} C

Question 10 of 10

According to MO theory, which of the following ranks the nitrogen species in terms of increasing bond order?

A{tex}N^{2-}_{2} < N^{-}_{2} < N_2{/tex}

B{tex}N_2 < N^{2-}_{2} < N^{-}_{2}{/tex}

C{tex}N^{-}_{2} < N^{2-}_{2} < N^{-}_{2}{/tex}

D{tex}N^{-}_{2} < N_2 < N^{2-}_{2}{/tex}