DEMOEXAM | ScoreExams

Question 1 of 10

The name of the compound in figure is

A(2Z, 4Z)-2, 4-hexadiene

B(2Z, 4E)-2, 4-hexadiene

C(2E, 4Z)-2, 4-hexadiene

D(4E, 4Z)-2, 4-hexadiene

E(2E, 4E)-2, 4-hexadiene

Question 2 of 10

The oxidation state of the most electronegative element in the products of the reaction between {tex}BaO_2{/tex} and {tex}H_2SO_4{/tex} are:

A0 and 1

B-1 and -2

C-2 and 0

D-2 and +1

Question 3 of 10

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. The force constant of the longer piece will be

A1.5k

B3k

C(3/2) k

D(2/3) k

E(1/3)k

Question 4 of 10

The major product of the reaction between tert-butylchloride and sodium-ethoxide is

A2-methylprop-1-ene

B1-butene

C2-butene

Dethene

E2-ethoxy-2-methylpropane

Question 5 of 10

In a polymer sample, 30% of molecules have a molecular mass of 20,000 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer?

A40,300

B30,600

C43,333

D50,400

Question 6 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 7 of 10

The two slits are 1 mm apart from each other and illuminated with a light of wavelength 5 x 10^-7 m. If the distance of the screen is 1 m from the slits, then the distance between third dark fringe and fifth bright fringe is

A1.5 mm

B0.75 mm

C1.25 mm

D0.625 mm

E2.5 mm

Question 8 of 10

Both ethene and ethyne can be made in one step reactions from

A{tex}Br - CH_2 - CH_2Br{/tex}

B{tex}CH_3 - CH_2OH{/tex}

C{tex}CH_3 - CH_2Br{/tex}

D{tex}CHCl_3{/tex}

Question 9 of 10

Which one of the following pairs of substances will not produce hydrogen when reacted together?

ACopper and conc. nitric acid

BEthanol and metallic sodium

CMagnesium and steam

DPhenol and metallic sodium

ESodium hydride and water

Question 10 of 10

The correct order of ionic radii of {tex}Y^{3+}, La^{3+}, Eu^{3+}{/tex} and {tex}Lu^{3+}{/tex}is

A{tex}Y^{3+} < La^{3+} + Eu^{3+} < Lu^{3+}{/tex}

B{tex}Lu^{3+} << Y^{3+} < Eu^{3+} < La^{3+}{/tex}

C{tex}Lu^{3+} < Eu^{3+} < La^{3+} < Y^{3+}{/tex}

D{tex}La^{3+} < Eu^{3+} < La^{3+} < Y^{3+}{/tex}