Correct Answer: B. it has six pairs of legs

Correct Answer: D. 3am, 16th January

Explanation

(a)(i) An effective collision is one that results in the formation of the product(s)

(ii) \(\Delta\)G Stands for free energy change. \(\Delta\)H stands for change in heat content or enthalpy; T\(\Delta\)S stands for the entropy term

(iii) The system is in a state of (dynamic) equilibrium

(b)(i) Le Chatelier's principle states that if a chemical system is in equilibrium and one of the factors involved in the system is altered, the equilibrium position will shift so as to annul the effect of the change.

(ii) (1) Increase the pressure

(2) Concentration

(3) Lower the temperature.

(iii) KC = \(\frac{[A_2B]^2}{[A_2]^2[B_2]}\) or KP \(\frac{P^2A_2B}{P^2A_2PB_2}\)

(c)(i) Sawdust has a larger surface area than a log of wood of the same mass. Since reaction rate increases with increase in surface area hence the sawdust burns out faster.

(ii)(i) Grind/Pulverise the wire that will make the particle smaller

(2) Heat the reaction mixture or increase in temperature

(3) Use a more concentrated acid

(iii)(i) Decomposition of silver halides/trioxonitrate (v) (ii) Reaction of methane with chlorine.

Correct Answer: C) increase the yield of PCl₅

Explanation

In the given reaction, \(PCl_{5(g)} \rightarrow PCl_{3(g)} + Cl_{2(g)}\), we can see that one mole of \(PCl_5\) gas is decomposing into one mole of \(PCl_3\) gas and one mole of \(Cl_2\) gas. This means that the total number of moles of gas is increasing in this reaction.

According to Le Chatelier's Principle, if a system at equilibrium is subjected to a change in pressure, the system will adjust itself to counteract the change. In this case, an increase in pressure will cause the system to shift the equilibrium in the direction of the reaction that produces fewer moles of gas, in order to reduce the pressure.

Since the forward reaction (formation of \(PCl_3\) and \(Cl_2\)) produces more moles of gas, the reverse reaction (formation of \(PCl_5\)) will be favored when pressure is increased. Therefore, an increase in pressure will increase the yield of \(PCl_5\), as stated in Option C. It's essential to note that the reaction speed is not affected by the pressure change, so options A and D don't apply.

Correct Answer: D) 122.50g

Correct Answer: C) income and expenditure account

Correct Answer: D. legislative

Explanation

(a)(i) The law of supply in agriculture states that the higher the price, the greater the quantity of produce that will offered for sale and vice versa.

(ii) Example of a supply schedule for maize

Example of supply curve for maize

(b) Causes of change in supply of an agricultural produce are: (i) changes in price of commodity. (ii) changes in t cost of production (iii) changes in the technique of production. (iv) the effect of weather. (v) the effect of taxation ( shift in consumption by consumers. (vii) change in demand. (viii) change in distribution / marketing channels.

Correct Answer: A. evil

Correct Answer: B. parasite