DEMOEXAM | ScoreExams

Question 1 of 10

Sulphur trioxide can be obtained by which of the following reaction.

A{tex}CaSO_4 + C x\rightarrow{\Delta}{/tex}

B{tex}Fe_2 (SO_4)_3 + C x\rightarrow{\Delta}{/tex}

C{tex}S + H_2 SO_4 x\rightarrow{\Delta}{/tex}

D{tex}H_2 SO_4 + PCl_5 x\rightarrow{\Delta}{/tex}

Question 2 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}

Question 3 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 4 of 10

A2 tan x + c

B√cot x + c

C2 √tan x + c

Dtan ² x + c

Ecot x + c

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, b, c (all positive) are the pth, qth, and rth terms of a geometric progression then

Apqr

B0

Cp + q + r

Dpq + qr + rp

E(p + q + r)²

Question 7 of 10

A needle made of bismuth is suspended freely in a magnetic field. The angle which the needle makes with the magnetic field is

A0°

B45°

C90°

D180°

Eany angle with which it is placed

Question 8 of 10

A binary compound of elements X and Y contains 50% of X. If the atomic masses of X and Y are 10 and 20 and the molecular mass of the compound is 120, the molecular formula of the compound is

A{tex}X_2 {/tex}

B{tex}X_4Y_2{/tex}

C{tex}X_6Y_3{/tex}

D{tex}X_3Y_2{/tex}

Question 9 of 10

Two finite sets have m and n elements. The number of elements in the power set of first set is 48 more than the total number of elements in the power set of the second set. Then the values of m and n are

A7, 6

B6, 3

C6, 4

D7, 4

E3, 7

Question 10 of 10

The force between two magnetic poles is F. If the distance between the poles and the pole strenghts is doubled, then the force experienced is:

A2F

BF/2

CF/4

DF

E4F