When an acidic solution is diluted, what happens to its pH?

• A. It depends on the specific acid
• B. It decreases
• C. It remains the same
• D. It increases

(i) Write the structure of 2—chloro-2—methylpropane.

(ii) Consider the compound X represented by the structure below:

(b)(i) List two products obtained from fractional distillation of petroleum;

(ii) State one use of each product in (b)(i) above,

(iii) Mention one disadvantage of crude oil production

(c)(i) Mention the monomer of protein (ii) A compound has an empirical formula of CHO\(_2\) and its molar mass is 90. Deduce the molecular formula of the compound. [H = 1, C = 12, O = 16].

(d) Use the reaction scheme below to answer questions (i).— (iv).

(i) State the reagents needed for stages II and V;

(ii) Nanie the product Q of reaction in stage IV;

(iii) State the conditions required for stage III;

(iv) Give the names of the processes in stages I, II, Ill and V respectively.

Which of the following elements is diatomic?

• A. Sodium
• B. Oxygen
• C. Iron
• D. Neon

An element, E, has the electronic configuration 1s22s22p63s2p3. The reaction of E with a halogen X can give?

• A. EX₃ and EX₅
• B. EX₃ only
• C. EX₅ only
• D. EX₂ and EX₃

The correct name for HCOOC₂H₅ is

• A) methylethanoate
• B) ethylethanoate
• C) ethylmethanoate
• D) propylethanoate

The aqueous solution which has pH > 7 is

• A. FeCI3(aq)
• B. CuSO4(aq)
• C. KNO3(aq)
• D. Na2CO3(aq)

Which of the following halogens is liquid at room temperature?

• A. Chlorine
• B. Fluorine
• C. lodine
• D. Bromine

The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is

• A. oxygen
• B. chlorine
• C. nitrogen
• D). hydrogen

The simplest branched-chain hydrocarbon is

• A) ethane
• B) ethene
• C) propane
• D) butane

An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

• A. 32
• B. 20
• C. 14
• D. 12