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# Chemistry Study Centre for JAMB, WAEC and NECO

Chemistry is the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances. This study centre is designed to help you become a better chemistry student.

## Past Questions (369) - Page 1

### Question 1

The minimum amount of energy required for effective collisions between reacting particles is known as

Exam Body: WAEC

### Question 2

The bond formed between $$H_2O$$ and $$H^+$$ to form the hydroxonium $$H_3O^+$$ is

Exam Body: WAEC

### Question 3

An element $$X$$ froms the following oxides $$X_2O, XO$$ and $$XO_2.$$ This phenomenon illustrates the law of ________?

Exam Body: WAEC

### Question 4

How many moles of oxygen would contain $$1.204 \times 10^24$$ molecules?NB: Avogadro's constant (NA) $$= 6.02 \times 10^23$$

Exam Body: WAEC

### Question 5

Which of the following statements about solids is correct?

Exam Body: WAEC

### Question 6

Which of the following apparatus can be used to measure a specific volume of a liquid accurately?

Exam Body: WAEC

### Question 7

The general gas equation $$\frac{PV}{T} = K$$ is a combination of

Exam Body: WAEC

### Question 8

The spreading of the scent of a flower in a garden is an example of_____?

Exam Body: WAEC

### Question 9

Propane carbon(IV)oxide diffuse at the same rate because [H = 1.00, C = 12.0, O = 16.0]

Exam Body: WAEC

### Question 10

The energy which accompanies the addition of an electron to an isolated gaseous atom is

Exam Body: WAEC

### Question 11

An aqueous solution of (NH4)2 SO4 is

Exam Body: WAEC

### Question 12

When NH4Cl(s) is dissolved in water, the container feels cold to touch. This implies

Exam Body: WAEC

### Question 13

The pH of four solutions M,N,Q and R are 2,6,8 and 11 respectively.Which of the following deductions about the solutions is correct?

Exam Body: WAEC

### Question 14

Consider the following reaction equationH3O+(aq) + OH(aq) → 2H2O(l)The reaction represents

Exam Body: WAEC

### Question 15

The refreshing characteristic taste of fizzy drinks is due ot the presence of

Exam Body: WAEC

### Question 16

Chemical equilibrium is attained when

Exam Body: WAEC

### Question 17

Which of the following factors will affect the rate of the reaction represented by the following equation?2HCl(aq) + CaCO3(s) → CaCl2(aq) + H2O(l) + CO2(g)I. PressureII. ConcentrationIII. Nature of reactantsIV. Temperature

Exam Body: WAEC

### Question 18

On evaporation to dryness, 3503 of saturated solution of salt Z gave 55.5g of salt. What is the solubility of the salt? [Z = 101]

Exam Body: WAEC

### Question 19

Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?

Exam Body: WAEC

### Question 20

Which of the following bonds are broken when ethanol is boiled?I. Covalent bondsII. Ionic bondsIII. Hydrogen bonds

Exam Body: WAEC