DEMOEXAM | ScoreExams

Question 1 of 10

If α, β, γ are the angles made by a straight line with the coordinate axes, then sin²α+sin²β+sin²γ is

A0

B1

C2

D3/2

E2/3

Question 2 of 10

Which of the following statement is true?

A{tex}HClO_4{/tex} is aweaker acid than {tex}HClO_3{/tex}

B{tex}HNO_3{/tex} is a stronger acid than {tex}HNO_2{/tex}

C{tex}H_3 PO_3{/tex} is a stronger acid than {tex}H_2 SO_3{/tex}

DIn aqueous medium HF is a stronger acid than HCl

Question 3 of 10

A unit vector in the plane of vector i + 2j + k and i + j + 2k and perpendicular to 2i + j + k is

Aj - k

B(i + j) / √2

C(j + k) / √2

D(j - k) / √2

E5 (j-k)

Question 4 of 10

The condition that ax + by + c = 0 is tangent to the parabola y² = 4ax is

Aa² = b² = c²

Ba = b

Cb² = c

Db² = a

Ea ² = b

Question 5 of 10

Two thin metallic strips carrying current in the direction shown, cross each other perpendicularly without touching but being close to each other, as shown. The regions which contain some points of zero magnetic induction are:

AI and II

BI and III

CI and IV

DII and III

EII and IV

Question 6 of 10

Which of the following is diamagnetic?

Asuperoxide ion

Bcarbon molecule

Cunipositive ion of nitrogen molecule

Doxygen molecule

Question 7 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 8 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 9 of 10

Which of the following will not produce ethane?

ASodalime decarboxylation of sodium propionate

BReduction of acetone with HI and red P.

CHydrogenation of ethene in presence of Raney nickel

DTreating {tex}CH_3 I{/tex} with Na

Question 10 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