Correct Answer: A. Sp³

Explanation

The correct answer is A. Sp³.

Here's a breakdown of why:

• A. Sp³ hybridization: Involves the mixing of one s atomic orbital and three p atomic orbitals to form four equivalent sp³ hybrid orbitals. These four hybrid orbitals arrange themselves in a tetrahedral geometry to minimize repulsion, with bond angles of approximately 109.5°. Examples include methane (CH₄).

• B. Sp² hybridization: Involves the mixing of one s orbital and two p orbitals, resulting in three sp² hybrid orbitals and one unhybridized p orbital. This leads to a trigonal planar geometry with bond angles of 120°. Examples include ethene (C₂H₄) and boron trifluoride (BF₃).

• C. Sp hybridization: Involves the mixing of one s orbital and one p orbital, forming two sp hybrid orbitals and two unhybridized p orbitals. This results in a linear geometry with a bond angle of 180°. Examples include acetylene (C₂H₂) and carbon dioxide (CO₂).

• D. Sp₂d (or sp²d): This is not a standard hybridization for common tetrahedral molecules. Hybridizations involving d orbitals typically lead to geometries like square planar (e.g., dsp² or sp²d, depending on convention) or octahedral (sp³d²).

Thus, Sp³ hybridization is uniquely associated with tetrahedral molecular geometry.

Correct Answer: A. Queen Amina

Explanation

Salma stayed in Queen Amina's hostel

Explanation

(a)An environmental hazard is a substance, state or event which has the potential to threaten the surrounding natural environment / or adversely affect people's health, including pollution and natural disasters such as storms and earthquakes

(b)*Cosmic rays*Drought*Earthquake.

(c)*afforestation

*irrigation

*rotational/controlled grazing

*creation of shelter belts

*legislation against indiscriminate bush burning.

Explanation

(i) Manipulation of the constitution to suit the selfish interest of the executive instead of the national interest.

(ii) Ineffective control of delegated legislation.

(iii) Interference with the independence of the judiciary.

(iv) Inability of the legislature to check the excesses of the executive.

(v) Flouting of decisions of the judiciary by the executive and the legislature.

(vi) Disrespect for Fundamental Human Rights by government and its agents.

(vii) Limitation of the rights and freedom of citizens by government during emergency periods.

(viii) Undue delay of trials of suspects by government.

(ix) Social and political discrimination by government e.g. religion, ethnicity, gender, etc.

(x) Misuse of Para-military organizations.

(xi) Establishment of special tribunals and extra judicial bodies.

(xii) Failure to give adequate publicity to laws.

(xiii) By making retrospective legislation or backdated laws.

(xiv) If accused persons are denied defence lawyers, especially of their own choice.

(xv) Denial of right of appeal.

(xvi) Engagement of secret trials of suspects.

Correct Answer: B. trypanosome

Explanation

(a) Means is the average of a series of figures or values. It is obtained by dividing the sum of these figures by the total number of the figures or values. It is also the average of a collection of observation.

(ii) The median is an average which is the middle value when figures are arranged in order of magnitude. In an even distribution the median is the average of the two middle numbers.

(iii) Mode is a measure of central tendency. It tells us the observation which is most popular, that is, the most frequently occurring value in a distribution. From the following observations 1, 3, 4, 3, 5, 3, mode is 3

(b) Mean = \(\frac{21 +22+23+23+23+24+24+25+26+27+28+29+30+31+34} {15}\)

= \(\frac{390} {15}\) =26

median: 21, 22, 23, 23, 23, 24, 24, 25 26, 27, 28, 29, 30, 31, 34, = 25

Mode = 23

Correct Answer: B. A Carboxylic acid

Correct Answer: A. production

Correct Answer: C. commendation

Correct Answer: C. symbolism