In dry cell, what acts as a negative electrode?

• Zinc

• Graphite

• Ammonium chloride

• Manganese dioxide

Which halide of magnesium has highest ionic character?

• Chloride

• Bromide

• Iodide

• Fluoride

The reaction takes place in two steps as

$$\begin{gathered} \left(\mathrm{i}\right) {\mathrm{NO}}_2\mathrm{Cl}\left(\mathrm{g}\right) \stackrel{{\mathrm{k}}_1}{\to } {\mathrm{NO}}_2\left(\mathrm{g}\right) + \mathrm{Cl}\left(\mathrm{g}\right) \\ \left(\mathrm{ii}\right) {\mathrm{NO}}_2\mathrm{Cl}\left(\mathrm{g}\right) +\mathrm{Cl}\left(\mathrm{g}\right) \stackrel{{\mathrm{k}}_2}{\to } {\mathrm{NO}}_2\left(\mathrm{g}\right) + \mathrm{Cl}\left(\mathrm{g}\right) \end{gathered}$$

Identify the reaction intermediate.

• NO₂Cl (g)

• NO₂(g)

• Cl₂(g)

• Cl(g)

The relation between solubility of a gas in liquid at constant temperature and external pressure is stated by which law?

• Raoult's law

• van't Hoff- Boyle's law

• van't Hoff- Charles' law

• Henry's law

Identify the metal that forms colourless compounds.

• Iron (Z = 26)

• Chromium (Z = 24)

• Vanadium (Z=23)

• Scandium (Z =21)

What is the highest oxidation state exhibited by group 17 elements?

• +1

• +3

• +5

• +7

The rate constant and half-life of a first order reaction are related to each other as

• ${\mathrm{t}}_{1/2}=\frac{0.693}{\mathrm{k}}$

• t_1/2 = 0.693 k

• k = 0.693 t_1/2

• ${\mathrm{kt}}_{1/2} =\frac{1}{0.693}$

28.

Brown ring test is used for detection of which radical?

• Ferrous

• Nitrite

• Nitrate

• Ferric

Which of the following is a neutral complex?

• [Pt(NH₃)₂Cl₂]

• [Co(NH₃)₆]Cl₃

• [Ni(NH₃)₆]Cl₂

• K₄[Fe(CN)₆]

Identify the compound amongst the following of which 0.1 M aqueous solution has highest boiling point.

• Glucose

• Sodium chloride

• Calcium chloride

• Ferric chloride