31.

Which one of the following statements is not correct?

• Physical adsorption decreases with increase in the temperature

• Physical adsorption is multtlayered

• Activation energy of physical adsorption is very high

• Enthalpy change of physical adsorption is about 20 kJ mol

Which one of the following is a correct pair with respect to molecular formula of xenon compound and hybridization state of xenon in it?

• XeF₄, sp³

• XeF₂, sp

• XeF₂, sp³d

• XeF₄, sp²

When bauxite powder is mixed with coke and reacted with nitrogen at 2075 K, carbon monoxide and X are formed. What is the gas formed when X is reacted with water?

• NH₃

• N₂

• N₂O

• O₂

Fluorosis disease is caused due to the reaction of with excess of fluoride in the body.

• Ca

• Mg

• Fe

• K

0.066 g of metal was deposited when a current of 2 ampere is passed through a metal ion solution for 100 seconds. What is the electrochemical equivalent (in gram coulomb^-1) of the metal ?

• 3.3 × 10^-6

• 3.3 × 10^-4

• 0.033

• 3.3

10 g of a radioactive element is disintegrated to 1 g in 2.303 minutes.What is the half-life (in minutes) of that radioactive element?

• 1/ 0.693

• 6.93

• 1

• 0.693

In the following reaction, X and Y are respectively

CH₃COOH + NH₃ → X $\stackrel{∆}{\to }$ Y + H₂O

• CH₃CONH₂, CH₄

• CH₃COONH₄, CH₃CONH₂

• CH₃CONH₂, CH₃COOH

• CH₃NH₂, CH₃CONH₂

Which one of the following is the molecular formula of a tertiary amine ?

• C₂H₇N

• C₃H₉N

• CH₅N

• CH₃N

What is the catalyst used in the conversion of acetaldehyde to acetic acid ?

• Manganese acetate

• LiAlH₄

• H₂/ N_I

• Na/ NH₃

What is X in the following reaction?

2CH₃COCH₃ $\stackrel{\mathrm{Ba}(\mathrm{OH}{)}_2}{\to }$ X

• H₃C-$\underset{{\mathrm{CH}}_3}{\overset{\mathrm{OH}}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}$-CH₂-$\stackrel{\mathrm{O}}{\stackrel{\left|\right|}{\mathrm{C}}}$-CH₃

• H₃C-$\underset{{\mathrm{CH}}_3}{\overset{\mathrm{OH}}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}$-CH₂-CH₂-CHO

• CH₃CH(CH₃)CH₂COCH₃

• H₃C-$\underset{{\mathrm{CH}}_3}{\underset{|}{\mathrm{CH}}}-\underset{\mathrm{OH}}{\underset{|}{\mathrm{CH}}}-\underset{\mathrm{O}}{\underset{\left|\right|}{\mathrm{C}}}$-CH₃