Correct Answer: D. raw materials

Correct Answer: D. 180

Explanation

To find the relative molecular mass of a compound with the empirical formula CH₂O, we first need to calculate the empirical formula mass (EFM).

Given atomic masses:

H = 1

C = 12

O = 16

Calculate the EFM for CH₂O:

Mass of Carbon (C) = 1 atom * 12 = 12

Mass of Hydrogen (H) = 2 atoms * 1 = 2

Mass of Oxygen (O) = 1 atom * 16 = 16

Empirical Formula Mass (EFM) = 12 + 2 + 16 = 30

The relative molecular mass (RMM) of a compound is always an integer multiple of its empirical formula mass (EFM).

So, RMM = n * EFM, where 'n' is a positive integer (1, 2, 3, ...).

Now, let's check which of the given options is an integer multiple of 30:

A. 42: 42 / 30 = 1.4 (not an integer)

B. 45: 45 / 30 = 1.5 (not an integer)

C. 126: 126 / 30 = 4.2 (not an integer)

D. 180: 180 / 30 = 6 (an integer)

Since 180 is an integer multiple of 30 (specifically, 6 times 30), it is the only plausible relative molecular mass among the given options for a compound with the empirical formula CH₂O.

The final answer is 180.

Correct Answer: C. hands

Explanation

Money is anything that is generally acceptable as a medium of exchange ( for instance, as a means of settling debts) and at the same time acts as a measure and a store of value. e.g naira and kobo in Nigeria.

The characteristics of Money are:

(i)Divisibility: It should be divisible into convenient units without losing its value, e.g. N50, N20 etc.

(ii)General acceptability:It should be acceptable in the society in which it is used.

(iii)Relatively scarce: It must be relatively scarce but not too scarce.

(iv)Portability: It should be easy to carry about.

(v)Durability: It should be able to last for a long period of time.

(vi)Homogeneity: The money material must be the same size and quality. Twenty naira note held by Mr. B must be the same twenty naira held by Mr. A in any part of the country.

(vii)Stability: The value of money must be stable.

Correct Answer: D. deflation

Correct Answer: B. Limited supply of productive resources

Explanation

The fundamental economic problem facing all societies is the problem of scarcity or limited resources to satisfy human wants. As we all know, human wants and unlimited, and the resources meant to satisfy these needs are less than required.

Correct Answer: C. Zn²⁺

Correct Answer: D. quantum numbers of electrons

Correct Answer: C. Rapid growth of population

Correct Answer: B. 17

Explanation

Arithmetic mean, x̄= ∑fx n where: x̄= Arithmetic mean ∑ = sum of X = series of figures in a given data f = nunmber of times a particular number occurs (frequency) n = number of figures or element From the question: Since, x̄= ∑fx N Then, x̄= ∑fx N =340/20 = 17