The following data is obtained during the first order thermal decomposition of 2A(g)→ B(g) +C(s) at constant volume and temperature.

The rate constant in min^-1

• 0.0693

• 6.93

• 0.00693

• 69.3

Which one of the following is an example for homogeneous catalysis?

• Manufacture of sulphuric acid by Contact process

• Manufacture of ammonia by Haber's process

• Hydrolysis of sucrose in presence of dilute hydrochloric acid

• Hydrogenation of oil

A white crystalline salt A reacts with dilute HCl to liberate a suffocating gas B and also forms a yellow precipitate. The gas B turns potassium dichromate acidified with dilute H₂SO₄ to a green coloured solution C. A, B, C are respectively

• Na₂SO₃, SO₂, Cr₂(SO₄)₃

• Na₂S₂O₃, SO₂, Cr₂(SO₄)₃

• Na₂SO₂ , SO₂, Cr₂(SO₄)₃

• Na₂SO₄, SO₂, Cr₂(SO₄)₃

Molecules of a noble gas do not possess vibrational energy because a noble gas

• is monoatomic

• is chemically inert

• has completely filled shells

• is diamagnetic

45.

E₁, E₂, E₃ are the emf values of the three galvanic cells respectively.

$$\begin{gathered} \left(\mathrm{i}\right)\hspace{0.17em}\mathrm{Zn}| {\mathrm{Zn}}_{1\mathrm{M}}^{2+}|| {\mathrm{Cu}}_{0.1\mathrm{M}}^{2+}|\mathrm{Cu} \\ \left(\mathrm{ii}\right)\hspace{0.17em}\mathrm{Zn}| {\mathrm{Zn}}_{1\mathrm{M}}^{2+}|| {\mathrm{Cu}}_{1\mathrm{M}}^{2+}|\mathrm{Cu} \\ \left(\mathrm{iii}\right)\mathrm{Zn}| {\mathrm{Zn}}_{0.1\mathrm{M}}^{2+}|| {\mathrm{Cu}}_{1\mathrm{M}}^{2+}|\mathrm{Cu} \end{gathered}$$

Which one of the following is true?

• E₁> E₂ >E₃

•  E₂ >E₃ >E₁

• E₃ >E₂ > E₁

• E₁> E₃ >E₂

Out of the compounds below the vapour pressure of (B) at a particular temperature is

• higher than that of (A)

• lower than that of (A)

• higher or lower than (A), depending on the size of the vessel

• same as that of (A)

An oxygen containing organic compound upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is

• an aldehyde

• a primary alcohol

• a secondary alcohol

• a ketone

The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits

• geometrical isomerism

• optical isomerism

• neither optical nor geometrical isomerism

• both optical and geometrical isomerism

Which one of the following has the most nucleophilic nitrogen?

The correct sequence of reactions to convert p-nitrophenol into quinol involves

• reduction, diazotization and hydrolysis

• hydrolysis, diazotization and reduction

• hydrolysis, reduction and diazotization

• diazotization, reduction and hydrolysis