21.

Which of the following represents the correct order of decreasing number of S = O bonds?

• H₂SO₄ > H₂SO₃ > H₂S₂O₈

• H₂S₂O₈ > H₂SO₃ > H₂SO₄

• H₂S₂O₈ > H₂SO₄ > H₂SO₃

• H₂SO₃ > H₂S₂O₈ > H₂SO₄

Given that the reduced temperature, $\mathrm{\theta } = \frac{\mathrm{T}}{{\mathrm{T}}_{\mathrm{C}}}$; the reduced pressure, $\mathrm{\pi } = \frac{\mathrm{F}}{{\mathrm{F}}_{\mathrm{C}}}$ and the reduced volume, $\mathrm{\varphi } = \frac{\mathrm{V}}{{\mathrm{V}}_{\mathrm{C}}}$ 

Thus, it can be said that the reduced equation of state may be given as

• $\left(\frac{\mathrm{\pi }}{3} + \frac{1}{\mathrm{\phi }}\right) \left(3\mathrm{\varphi } - 1\right) = \frac{8}{3} \mathrm{\theta }$

• $\left(\frac{\mathrm{\pi }}{4} + \frac{1}{\mathrm{\phi }}\right)\left(3\mathrm{\theta } - 1\right) = \frac{3}{8} \mathrm{\phi }$

• $\left(\frac{\mathrm{\pi }}{3} + \frac{1}{\mathrm{\phi }}\right)\left(\mathrm{\varphi } - 1\right) = \frac{3}{8} \mathrm{\theta }$

• $\left(\frac{\mathrm{\pi }}{3} + \frac{1}{{\mathrm{\phi }}^2}\right)\left(3\mathrm{\varphi } - 1\right) = \frac{8}{3} \mathrm{\theta }$

$$\begin{gathered} {\mathrm{SF}}_4 \stackrel{\mathrm{Hydrolysis}}{\to } \mathrm{X} +\hspace{0.17em}\mathrm{Y} \\ \mathrm{X} + {\mathrm{H}}_2\mathrm{S} \to \mathrm{Z} \end{gathered}$$

Here, Z is

• SO₃

• colloidal sulphur

• gaseous sulphur

• solid sulphur

What is product of the following sequence of reactions?

When KMnO₄ acts as an oxidising agent and ultimately forms Mn${\mathrm{O}}_4^{2-}$  MnO₂, Mn₂O₃ and Mn²⁺ then the number of electrons, transferred in each case respectively are

• 1, 3, 4, 5

• 3, 2, 1, 4

• 1, 5, 3, 7

• 4, 3, 2, 1

In acidic medium, dichromatic ion oxidises ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is 294 g its gram equivalent weight (in grams) is

• 24.5

• 49

• 125

• 250

Find out the correct stereoisomeric product for the following reaction,

• d-form

• l- from

• meso-form

• racemic mixture

Point out the correct statement.

• Below 710$°$C, C is better reducing agent than CO

• Below 710°C, CO is better reducing agent than C

• Below 710$°$C, CO is an oxidising agent

• Below 710$°$C, CO, is a reducing agent

Which of the following atomic and physical properties of hydrogen is false?

• Hydrogen > Deuterium > Tritium; (melting point/ K)

• Hydrogen < Deuterium < Tritium; (boiling point/ K)

• Hydrogen < Deuterium < Tritium; (density /gL^-1)

• Hydrogen > Deuterium > Tritium; (% relative abundance)

Eutrophication of a lake means, it

• is low is nutrients

• is high in nutrients

• has a high temperature

• has excess amount of organic matter