(a) Mention one process apart from respiration, which increases the amount of carbon (IV) oxide in the atmosphere.

(b)(i) State one use of sodium hydrogentrioxocarbonate (IV).

(ii) Write an equation to show the action of heat on sodium hydrogentrioxocarbonate(IV).

Excess ethanol was soarked with 3g of pure oxygen in a combustion chamber. How many molecules of CO₂ are produced? [N = 6.02 × 10²³ molecules mol^_1]

• A) 6.02
• B)3.01
• C) 3.76
• D) 2.84

The shape of a molecule of water is?

• A. Non-linear
• B. Octahedral
• C. Pyramidal
• D. Tetrahedral

The ratio of carbon atoms of hydrogen atoms in a hydrocarbon is 1:2. If its molecular mass is 56, what is its molecular formula?

• A. C₃H₆
• B. C₄H₈
• C. C₂H₄
• D. CH₂

When alkynes are hydrogenated completely, they produce compounds with the general molecular formula

• A. C_nH_n
• B. C_nH 2_2n+2
• C. C_nH_2n
• D. C_nH_2n-2

What of the following pairs of acid and base will produce a solution with pH less than 7 at equivalence point?

• A. HNO₃ and NaOH
• B. H₂SO₄ and KOH
• C. HCI and Mg(OH)₂
• D. HNO₃ and KOH

A hydrogen chloride gas reacted with oxygen gas to yield water and chlorine gas. The mole ratio of the hydrogen chloride gas to water is

• A. 1:3
• B. 2:1
• C. 3:1
• D. 4:1

The gas given off when ethanol reacts with sodium is

• A. Carbon(IV)oxide
• B. Hydrogen
• C. Methane
• D. Oxygen

Hydrogen sulphide gas can act as

• A) an oxidizing agent
• B) a dehydrating agent
• C) a bleaching agent
• D) a precipitating agent

Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?

• A.₁₀M³⁺
• B.₁₀M^3-
• C.₁₃M³⁺
• D.₁₃M^3-