DEMOEXAM | ScoreExams

Question 1 of 10

No of {tex}H_2O{/tex} molecules in a drop of water weighing 0.05g is:

A{tex}1.5 \times 10^{23}{/tex}

B{tex}1.672 \times 10^{21}{/tex}

C{tex}1.5 \times 10^{20}{/tex}

D{tex}6.022 \times 10^{22}{/tex}

Question 2 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 3 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 4 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 5 of 10

Propyne is treated with sodamide and the product is treated with methyl iodide to get

AButylamine

B2 - butene

C2 - butyne

DPropyl methyl amine

Question 6 of 10

At STP, volume of 0.01g of {tex}H_2{/tex} is the same as that of

A0.22g of {tex}CO_2{/tex}

B0.085g of {tex}NH_3{/tex}

C0.32g of {tex}SO_2{/tex}

Dall of these

Question 7 of 10

The coherent sources whose intensity ratio is 81:1 produce interference fringes. The ratio of minimum to maximum intensity i.e. I_min:I_max is

A16 : 25

B9 : 1

C1 : 9

D25 : 16

E5 : 4

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

The critical temperature of {tex}O_2, N_2, H_2{/tex} and {tex}CO_2{/tex} are 154.3K, 126K, 33.2K and 304K respectively. The extent of adsorption on tungsten may be highest in case of

A{tex}H_2{/tex}

B{tex}N_2{/tex}

C{tex}O_2{/tex}

D{tex}CO_2{/tex}

Question 10 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