On evaporation to dryness, 350cm³ of saturated solution of salt Z gave 55.5g of salt. What is the solubility of the salt? [Z = 101]

• A. 1.57 moldm^-3
• B. 3.14 moldm^-3
• C. 6.28 moldm^-3
• D. 12.56 moldm^-3

The compound that makes palm wine taste sour after exposure to the air for few days is

• A. Ethanol
• B. Ethanoic acid
• C. Methanol
• D. Methanoic acid

Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?

• A. CH₃COONa
• B. NH₄Cl
• C. NaCl
• D. KCl

Amino acids are obtained from proteins by

• A. Hydrolysis
• B. Oxidation
• C. Polymerization
• D. Reduction

Chemicals that are produced in small quantities and with very degree of purity are

• A. Bulk chemicals
• B. Fine chemicals
• C. Heavy chemicals
• D. Light chemicals

Which of the following bonds are broken when ethanol is boiled? I. Covalent bonds II. Ionic bonds III. Hydrogen bonds

• A. I only
• B. II only
• C. III only
• D. I, II, III

An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?

• A.¹³₆X
• B.¹³₇X
• C.¹⁹₆X
• D.¹⁹₇X

The quality of electricity required to discharge 1 mole of univalent ion is

• A. 9600C
• B. 48250C
• C. 96500C
• D. 193000C

The pH of four solutions M,N,Q and R are 2,6,8 and 11 respectively. Which of the following deductions about the solutions is correct?

• A. The pH of N is increased when the solution is diluted
• B. The pH of Q is increased when the solution is evaporated
• C. M is the most alkaline solution
• D. R is the most acidic solution

(a) Consider the following atoms: \(^R_T\)X; \(^S_T\)X.

(i) State the phenomenon exhibited by the two atoms.

(ii) What is the difference between the atoms?

(iii) Give two examples of elements that exhibit the phenomenon stated in (ai)

(iv) lf T is 17, write the electron configuration of the element

(b)(i) State two differences between metals and-non-metals with respect to their:

I. physical properties;

2. chemical properties.

(ii) Give one example of each for the following compounds:

I. an amphoteric oxide;

II. a hydride which evolves hydrogen when reacted with water;

Ill. a trioxocarbonate (IV) salt which is readily decomposed on heating;

IV. a chloride salt which is readily hydrolyzed in water.

(c)(i) State three characteristic properties of transition metals.

(ii) Write the electron configuration of \(_{30}Zn\)

(iii.) Explain briefly why zinc is not considered as a typical transition element.

(d) Consider the reaction represented by the following equation:- Na\(_2\)CO\(_{3(aq)}\) + MgCl\(_{2(aq)}\) ----> 2NaCl\(_{(aq)}\) + MgCO\(_{3(aq)}\). Calculate the mass of sodium trioxocarbonate (IV) needed to produce 3.36 of magnesium trioxocarbonate (IV). [C = 12.0, O = 16.0, Na = 23.0, Mg = 24:0 ]