DEMOEXAM | ScoreExams

Question 1 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 2 of 10

Cathode rays are produced when the pressure is of the order of

A2cm of Hg

B0.1cm of Hg

C0.01mm of Hg

D1μm of Hg

E0.001mm of Hg

Question 3 of 10

Two finite sets have m and n elements respectively. The total number of subsets of first set is 56 more than the total number of subsets of the second set. The values of m and n respectively are

A7, 6

B6, 3

C5, 1

D7, 8

E3, 6

Question 4 of 10

Select the wrong statement:

AIf a very small amount of {tex}AICl_3{/tex}is added to gold sol, coagulation occurs but if a large quantity of {tex}AICl_3{/tex} is added, there is no coagulation.

BOrganic ions are more strongly adsorbed on charged surfaces in comparison to inorganic ions.

CBoth emulsifier and peptising agents stabilise colloids but their actions are different.

DColloidal solution are thermodynamically stable.

Question 5 of 10

A binary liquid solution is prepared by mixing n - heptane and ethanol. Which one of the following statement is correct regarding the behaviour of the solution?

AThe solution formed is an ideal solution

BThe solution is non-ideal showing +ve deviation from Raoult's law

CThe solution is non-ideal, showing -ve deviation from Raoult's law

Dn - heptane shows +ve deviation while ethanol shows -ve deviation from Raoult's law

Question 6 of 10

If vector a = i + 2j + 3k and b = i × (a×i) + j×(a×j) + k×(a×k) then length of b is equal to

A√12

B2 √12

C3 √14

D2 √14

Question 7 of 10

Auto reduction is employed in the metallurgy of :

AHg

BAl

CTi

DZn

ECr

Question 8 of 10

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

A60°

B30°

C90°

D45°

E15°

Question 9 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}

Question 10 of 10

The radius of the coil which has 10 turns is 0.1m. The current required to produce a deflection of 60° (B_h = 4×10^-5T)

A3A

B1.1A

C2.1A

D1.5A

E2.6A