Correct Answer: D. From blue to pink

Explanation

Anhydrous cobalt chloride paper is blue in the absence of water. However, when it comes into contact with water, it undergoes a color change to pink due to the formation of hydrated cobalt chloride.

Correct Answer: B) is the outermost layer of the cortex

Explanation

This question is asking which statement about the piliferous layer of a root is false. The piliferous layer is located in the outermost part of the root and is responsible for absorbing water and nutrients from the soil. Option A states that the piliferous layer has a thin cuticle and this statement is correct. The cuticle is a waxy layer that covers the epidermis of the plant to reduce water loss, but in roots, the cuticle is thin to allow for water absorption. Option B states that the piliferous layer is the outermost layer of the cortex, and this statement is also correct. The cortex is the region of the root between the epidermis and the stele, and the piliferous layer is the outermost layer of the cortex. Option C states that the piliferous layer may bear root hairs, and this statement is correct. Root hairs are extensions of the epidermal cells that increase the surface area of the root for water and nutrient absorption. Option D states that the piliferous layer is replaced by cork in old roots, and this statement is false. The piliferous layer is not replaced by cork in old roots, but rather by other tissues such as the endodermis. Therefore, the false statement about the piliferous layer of a root is Option D

Correct Answer: A) Direct combination of constituent elements

Correct Answer: D. security markets

Correct Answer: C. prominent

Correct Answer: A. 48cm³

Explanation

Volume = base area x height = 1/2 x 4 x 3 x 8 = 48cm³

Correct Answer: D. 39.6^o and 212.4^o

Correct Answer: B. its total liabilities exceed total assets

Explanation

i) The principle is delegation. It enables a manager or superior to assign some of his duties to his subordinates.

ii) a) She is responsible for the recruitment, selection and staff placement.

b) She participates in staff appraisal and evaluation

(c) She serves as a liaison officer between Baku limited and labour unions

(d) She is responsible for management of training and staff development

(e) She is involved in the disengagement of staff/ dismissal of staff

(C) (a) Planning: It is the setting of goals and establishing of objectives and tasks to qualified staff

(b) organizing: This is the process of arranging and structuring of tasks into units and assigning such task to qualified staff.

(c) controlling: It involves monitoring of activities of the firm to ensure that set standards are followed and taking corrective actions where deviations occur.

d) Directing: This refers to the provision of guidance and supervision to subordinates in order to achieve organizational goals.

Correct Answer: C) 0.4

Explanation

The given question is related to the electrolysis of aluminum. To calculate the current required to deposit 0.27g of aluminum in 2 hours, we need to use Faraday's laws of electrolysis.

First, we need to find the number of moles of aluminum deposited:

Moles of aluminum = mass / molar mass = 0.27g / 27g/mol = 0.01 moles

Now we need to find the charge required to deposit 0.01 moles of aluminum:

1 mole of aluminum requires 3 moles of electrons, as aluminum has a valency of +3. So, 0.01 moles of aluminum will require 0.03 moles of electrons.

The charge required to deposit 0.01 moles of aluminum can be calculated using the Faraday constant (F) which relates the charge (Q) to the amount of substance (n) in moles and the number of electrons per mole:

Q = n * F

Q = 0.03 moles * 96500C/mol = 2895C

Now we need to find the current (I) required to deposit 0.27g of aluminum in 2 hours:

Current (I) = Charge (Q) / Time (t)

Time (t) = 2 hours = 7200 seconds (since 2 hours * 60 minutes/hour * 60 seconds/minute = 7200 seconds)

I = 2895C / 7200s = 0.4021A ? 0.4A

Therefore, the correct answer is Option C: 0.4A. The other options are incorrect because they do not represent the correct current required to deposit 0.27g of aluminum in 2 hours.