During the electrolysis of dilute tetraoxosulphate (IV) acid solution 0.05 mole of electrons were passed. What volume of gass was produced at the anode? (Gaseous Molar volume= 22.4dm³ at s.t.p) Half cell electrode potential

• A. 0.224dm³
• B. 0.280dm³
• C. 0.560dm³
• D. 2.24dm³

The mass of potassium hydroxide required to make 300.0cm³ of 0.4 moldm^-3 solution is {KOH = 56.0}

• A. 26.88g
• B. 13.44g
• C. 6.72g
• D. 3.36g

Which of the following statements is not correct about electrolysis?

• A) Reduction occurs at the anode
• B) Anions migrate to the anode
• C) Positive ions migrate to the cathode
• D) Concentration affects the discharge of ions

Which of the following statements about liquids is/are true?

I. Liquids maintain their volume at constant temperature. II. Liquids have fixed shape III. Liquids do not diffuse IV. Change in pressure affects volume of liquids

• A. I only
• B. IV only
• C. I and IV only
• D. II and III only

The acid that is used to remove rust is

• A) boric
• B) hydrochloric
• C) trioxonitrate (V)
• D) tetraoxosulphate (VI)

The solubilites of different solutes in a given solvent can be compared by

• A) plotting their solubility curves on separete axes
• B) plotting their solubility curves on the same axes
• C) plotting some of the solubility curves on the x-axis and others on the y-axis
• D) plotting their solubility curves on the x-axis only

2) \(2H_2O_{2(l)} \rightarrow 2O_{2(g)} + 4H^+_{(aq)} + 4e\), \(E^0 = -0.68V\)

• A) -0.66V
• B) -1.23V
• C) +0.554V
• D) +1.91V

Which of the following pairs illustrates isotopy?

• A. But-l-ene and but -2-ene
• B. Ortho-hydrogen and parahydrogen
• C. Oxygen and ozone
• D. Hydrogen and deuterium

The two elements₁₁X and₁₉Y are in the same group because they have the same

• A. valence electrons
• B. ionization energy
• C. number of shell
• D. atomic size

(a) Explain in terms of the kinetic theory why a tyre should not be overinflated.

(b)The following results were obtained at room temperature in an experiment to verify one of the gas laws using a glass syringe:

(i) Plot a graph of P against \(\frac{1}{v}\), using 1 cm to represent 0.01 atm on the vertical axis and 1cm to represent 0.02 unit on the horizontal axis.

(ii) Which of the gas laws is in agreement with the results?

(c) The flow chart below represents the stages involved in the manufacture of H\(_2\)SO\(_4\).

+x +Conc. H\(_2\)SO\(_4\) +H\(_2\)O

S + O\(_2\) \(\to\) SO\(_2\) \(\to\) SO\(_3\) \(\to\) Y \(\to\) Conc H\(_2\)SO\(_4\)

stage I stage II stage III stage IV

(i) Name the process represented by the chart.

(ii) Identify reactant X and product Y.

(iii) What are the operating temperature and pressure at stage II?

(iv) Mention the stage which requires a catalyst and state the catalyst used.

(v) Give the reason why the SO\(_3\) produced in stage II is not dissolved directly in water to form the acid

(d) When K\(_4\)Cr\(_2\)C\(_7\) dissolves in water, the following equilibrium is established:

Cr\(_2\)O\(^{2-}_{7(aq)}\) + H\(_2\)O\(_{(l)}\) \(\to\) 2CrO\(^{2-}_{4(aq)}\) + 2H\(_{aq}\)

(i) State the colour observed on adding a few drops of dilute H\(_2\)SO\(_4\) to the system.

(ii) Explain your answer in (d)(1).

(iii) What principle is applicable to this explanation?