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

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 3 of 10

If vectors a, b, c are non zero, non coplanar vectors, then (c x a) x (a x b) is

Aparallel to a

Bperpendicular to a

Cparallel to the plane of b and c

Dperpendicular to c

Eperpendicular to b

Question 4 of 10

For the data

the Karl Pearson coefficient is

A63 / (√ 94 × √ 66)

B63

C63 / √ 94

D63 / √ 66

E1 / [√(94 × 66)]

Question 5 of 10

In Young's double slit experiment, the width of one of the slits is slowly increased to make it twice the width of the other slit. Then in the interference pattern:

Athe intensity of maxima increase while that of minima decrease

Bintensities of both maxima and minima decrease

Cthe intensities of both maxima and minima remain the same

Dthe intensities of both maxima and minima increase

Question 6 of 10

If (2, 3, 5) is one end of a diameter of the sphere x² + y² + z² - 6x - 12y - 2z + 20 = 0, then the coordinates of the other end of the diameter are

A(4, 3, 5)

B(4, 9, -3)

C(4, 9, 3)

D(4, 3, -3)

E(4, 9, 5)

Question 7 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 8 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 9 of 10

Which of the following on thermal decomposition yields a basic as well as an acidic oxide?

A{tex}KClO_3{/tex}

B{tex}Na_2CO_3{/tex}

C{tex}NaNO_3{/tex}

D{tex}CaCO_3{/tex}

Question 10 of 10

Which of the following has maximum number of lone pairs associated with Xe?

A{tex}XeF_4{/tex}

B{tex}XeF_6{/tex}

C{tex}XeF_2{/tex}

D{tex}XeO_3{/tex}